- 05 4月, 2016 1 次提交
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由 Hannes Reinecke 提交于
The patch "scsi: rescan VPD attributes" introduced a regression in which devices that don't support VPD were being scanned for VPD attributes anyway. This could cause issues for some devices and should be avoided so the check for scsi_level has been moved out of scsi_add_lun and into scsi_attach_vpd so that all callers will not scan VPD for devices that don't support it. [mkp: Merge fix] Fixes: 09e2b0b1 ("scsi: rescan VPD attributes") Cc: <stable@vger.kernel.org> #v4.5+ Suggested-by: NAlexander Duyck <aduyck@mirantis.com> Signed-off-by: NHannes Reinecke <hare@suse.com> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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- 06 3月, 2016 1 次提交
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由 Hannes Reinecke 提交于
Add an 'access_state' field to struct scsi_device and display them in sysfs as 'access_state' and 'preferred_path' attribute. Signed-off-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Reviewed-by: NBart van Assche <bart.vanassche@sandisk.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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- 24 2月, 2016 2 次提交
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由 Hannes Reinecke 提交于
Add a new blacklist flag BLIST_SYNC_ALUA to instruct the alua device handler to use synchronous command submission for ALUA commands. Reviewed-by: NBart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NHannes Reinecke <hare@suse.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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由 Don Brace 提交于
The hpsa driver uses this function to cleanup inquiry data. Our new pqi driver will also use this function. This function was copied into both drivers. This patch exports sanitize_inquiry_string so the hpsa and the pqi drivers can use this function directly. Suggested-by: NHannes Reinecke <hare@suse.de> Suggested-by: Matthew R. Ochs mrochs@linux.vnet.ibm.com Reviewed-by: NKevin Barnett <kevin.barnett@pmcs.com> Reviewed-by: NJustin Lindley <justin.lindley@pmcs.com> Reviewed-by: NScott Teel <scott.teel@pmcs.com> Reviewed-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NDon Brace <don.brace@pmcs.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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- 03 12月, 2015 2 次提交
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由 Hannes Reinecke 提交于
Implement scsi_vpd_tpg_id() to extract the target port group id and the relative port id from SCSI VPD page 0x83. Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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由 Hannes Reinecke 提交于
Add a function scsi_vpd_lun_id() to return a unique device identifcation based on the designation descriptors of VPD page 0x83. As devices might implement several descriptors the order of preference is: - NAA IEE Registered Extended - EUI-64 based 16-byte - EUI-64 based 12-byte - NAA IEEE Registered - NAA IEEE Extended A SCSI name string descriptor is preferred to all of them if the identification is longer than 16 bytes. The returned unique device identification will be formatted as a SCSI Name string to avoid clashes between different designator types. [mkp: Fixed up kernel doc comment from Johannes] Signed-off-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NEwan Milne <emilne@redhat.com> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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- 01 12月, 2015 1 次提交
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由 Hannes Reinecke 提交于
The VPD page information might change, so we need to be able to update it. This patch implements a VPD page rescan whenever the 'rescan' sysfs attribute is triggered. Signed-off-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Reviewed-by: NShane Seymour <shane.seymour@hpe.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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- 29 8月, 2015 3 次提交
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由 Christoph Hellwig 提交于
Add a ->handler and a ->handler_data field to struct scsi_device and kill this indirection. Also move struct scsi_device_handler to scsi_dh.h so that changes to it don't require rebuilding every SCSI LLDD. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com> Reviewed-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NJames Bottomley <JBottomley@Odin.com>
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由 Christoph Hellwig 提交于
Add a single list of devices that need non-ALUA device handlers to the core scsi_dh code so that we can autoload the modules for them at probe time. While this is a little ugly in terms of architecture it actually significantly simplifies the code in addition to the new autoloading functionality. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com> Reviewed-by: NHannes Reinecke <hare@suse.de> Acked-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NJames Bottomley <JBottomley@Odin.com>
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由 Christoph Hellwig 提交于
While allowing dm-mpath to attach device handlers is a functionality we need for backwards compatibility reason there is no reason to reference count them and detach them if dm-mpath stops using the device for some reason. If the device handler works for the given device it can just stay attached, and we can take the retain_hw_handler codepath. Signed-off-by: NChristoph Hellwig <hch@lst.de> Acked-by: NMike Snitzer <snitzer@redhat.com> Acked-by: NHannes Reinecke <hare@Suse.de> Signed-off-by: NJames Bottomley <JBottomley@Odin.com>
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- 26 8月, 2015 1 次提交
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由 Hannes Reinecke 提交于
Log the ALUA state change unit attention correctly with the message log and emit an event to allow user-space tools to react to it. Signed-off-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NEwan D. Milne <emilne@redhat.com> Reviewed-by: NBart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: NJames Bottomley <JBottomley@Odin.com>
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- 01 6月, 2015 1 次提交
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由 Bart Van Assche 提交于
Move the functions that are used by both the initiator and target subsystems into scsi_common.c/.h. This change will allow to remove the initiator SCSI header include directives from most SCSI target source files in a later patch. Signed-off-by: NBart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJames Bottomley <JBottomley@Odin.com>
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- 05 2月, 2015 1 次提交
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由 Hannes Reinecke 提交于
dev_printk() is now a void function, so the related functions scmd_printk() and sdev_prefix_printk() should be made void, too. Reported-by: NStephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: NHannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 21 1月, 2015 1 次提交
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由 Christoph Hellwig 提交于
Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NJames Bottomley <JBottomley@Parallels.com> Reviewed-by: NEwan D. Milne <emilne@redhat.com> Reviewed-by: NHannes Reinecke <hare@suse.de>
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- 09 1月, 2015 1 次提交
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由 Hannes Reinecke 提交于
Implement a per-cpu buffer for formatting messages to avoid line breaks up under high load. This patch implements scmd_printk() and sdev_prefix_printk() using the per-cpu buffer and makes sdev_printk() a wrapper for sdev_prefix_printk(). Tested-by: NRobert Elliott <elliott@hp.com> Reviewed-by: NRobert Elliott <elliott@hp.com> Signed-off-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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- 15 12月, 2014 1 次提交
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由 Rafael J. Wysocki 提交于
After commit b2b49ccb (PM: Kconfig: Set PM_RUNTIME if PM_SLEEP is selected) PM_RUNTIME is always set if PM is set, so #ifdef blocks depending on CONFIG_PM_RUNTIME may now be changed to depend on CONFIG_PM. Replace CONFIG_PM_RUNTIME with CONFIG_PM everywhere under drivers/scsi/ and in include/scsi/scsi_device.h. Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: NAaron Lu <aaron.lu@intel.com> Acked-by: NChristoph Hellwig <hch@lst.de>
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- 24 11月, 2014 1 次提交
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由 Christoph Hellwig 提交于
Drop the now unused reason argument from the ->change_queue_depth method. Also add a return value to scsi_adjust_queue_depth, and rename it to scsi_change_queue_depth now that it can be used as the default ->change_queue_depth implementation. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMike Christie <michaelc@cs.wisc.edu> Reviewed-by: NHannes Reinecke <hare@suse.de>
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- 12 11月, 2014 6 次提交
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由 Christoph Hellwig 提交于
Remove the tagged argument from scsi_adjust_queue_depth, and just let it handle the queue depth. For most drivers those two are fairly separate, given that most modern drivers don't care about the SCSI "tagged" status of a command at all, and many old drivers allow queuing of multiple untagged commands in the driver. Instead we start out with the ->simple_tags flag set before calling ->slave_configure, which is how all drivers actually looking at ->simple_tags except for one worke anyway. The one other case looks broken, but I've kept the behavior as-is for now. Except for that we only change ->simple_tags from the ->change_queue_type, and when rejecting a tag message in a single driver, so keeping this churn out of scsi_adjust_queue_depth is a clear win. Now that the usage of scsi_adjust_queue_depth is more obvious we can also remove all the trivial instances in ->slave_alloc or ->slave_configure that just set it to the cmd_per_lun default. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMike Christie <michaelc@cs.wisc.edu> Reviewed-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
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由 Christoph Hellwig 提交于
Remove the ordered_tags field, we haven't been issuing ordered tags based on it since the big barrier rework in 2010. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMike Christie <michaelc@cs.wisc.edu> Reviewed-by: NBart Van Assche <bvanassche@acm.org> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
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由 Christoph Hellwig 提交于
Move all code to set up and tear down sdev->scsi_dh_data to common code. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMike Christie <michaelc@cs.wisc.edu> Reviewed-by: NHannes Reinecke <hare@suse.de>
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由 Christoph Hellwig 提交于
All drivers now do their own matching, so there is no more need to expose a device list as part of the interface. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMike Christie <michaelc@cs.wisc.edu> Reviewed-by: NHannes Reinecke <hare@suse.de>
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由 Christoph Hellwig 提交于
Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMike Christie <michaelc@cs.wisc.edu> Reviewed-by: NHannes Reinecke <hare@suse.de>
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由 Hannes Reinecke 提交于
Like scmd_printk(), but the device name is passed in as a string. Can be used by eg ULDs which do not have access to the scsi_cmnd structure. Signed-off-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NRobert Elliott <elliott@hp.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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- 16 9月, 2014 1 次提交
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由 Alan Stern 提交于
The SCSI specification requires that the second Command Data Byte should contain the LUN value in its high-order bits if the recipient device reports SCSI level 2 or below. Nevertheless, some USB mass-storage devices use those bits for other purposes in vendor-specific commands. Currently Linux has no way to send such commands, because the SCSI stack always overwrites the LUN bits. Testing shows that Windows 7 and XP do not store the LUN bits in the CDB when sending commands to a USB device. This doesn't matter if the device uses the Bulk-Only or UAS transports (which virtually all modern USB mass-storage devices do), as these have a separate mechanism for sending the LUN value. Therefore this patch introduces a flag in the Scsi_Host structure to inform the SCSI midlayer that a transport does not require the LUN bits to be stored in the CDB, and it makes usb-storage set this flag for all devices using the Bulk-Only transport. (UAS is handled by a separate driver, but it doesn't really matter because no SCSI-2 or lower device is at all likely to use UAS.) The patch also cleans up the code responsible for storing the LUN value by adding a bitflag to the scsi_device structure. The test for whether to stick the LUN value in the CDB can be made when the device is probed, and stored for future use rather than being made over and over in the fast path. Signed-off-by: NAlan Stern <stern@rowland.harvard.edu> Reported-by: NTiziano Bacocco <tiziano.bacocco@gmail.com> Acked-by: NMartin K. Petersen <martin.petersen@oracle.com> Acked-by: NJames Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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- 26 7月, 2014 3 次提交
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由 Martin K. Petersen 提交于
Despite supporting modern SCSI features some storage devices continue to claim conformance to an older version of the SPC spec. This is done for compatibility with legacy operating systems. Linux by default will not attempt to read VPD pages on devices that claim SPC-2 or older. Introduce a blacklist flag that can be used to trigger VPD page inquiries on devices that are known to support them. Reported-by: NKY Srinivasan <kys@microsoft.com> Tested-by: NKY Srinivasan <kys@microsoft.com> Reviewed-by: NKY Srinivasan <kys@microsoft.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com> CC: <stable@vger.kernel.org> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Christoph Hellwig 提交于
We currently set the field in common code based on the device type, but then only use it in the cdrom driver which also overrides the value previously set in the generic code. Just leave this entirely to the CDROM driver to make everyones life simpler. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
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由 Christoph Hellwig 提交于
Seems like these counters are missing any sort of synchronization for updates, as a over 10 year old comment from me noted. Fix this by using atomic counters, and while we're at it also make sure they are in the same cacheline as the _busy counters and not needlessly stored to in every I/O completion. With the new model the _busy counters can temporarily go negative, so all the readers are updated to check for > 0 values. Longer term every successful I/O completion will reset the counters to zero, so the temporarily negative values will not cause any harm. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com> Reviewed-by: NWebb Scales <webbnh@hp.com> Acked-by: NJens Axboe <axboe@kernel.dk> Tested-by: NBart Van Assche <bvanassche@acm.org> Tested-by: NRobert Elliott <elliott@hp.com>
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- 25 7月, 2014 2 次提交
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由 Christoph Hellwig 提交于
Avoid taking the queue_lock to check the per-device queue limit. Instead we do an atomic_inc_return early on to grab our slot in the queue, and if necessary decrement it after finishing all checks. Unlike the host and target busy counters this doesn't allow us to avoid the queue_lock in the request_fn due to the way the interface works, but it'll allow us to prepare for using the blk-mq code, which doesn't use the queue_lock at all, and it at least avoids a queue_lock round trip in scsi_device_unbusy, which is still important given how busy the queue_lock is. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NWebb Scales <webbnh@hp.com> Acked-by: NJens Axboe <axboe@kernel.dk> Tested-by: NBart Van Assche <bvanassche@acm.org> Tested-by: NRobert Elliott <elliott@hp.com>
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由 Christoph Hellwig 提交于
Avoid taking the host-wide host_lock to check the per-target queue limit. Instead we do an atomic_inc_return early on to grab our slot in the queue, and if necessary decrement it after finishing all checks. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com> Reviewed-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NWebb Scales <webbnh@hp.com> Acked-by: NJens Axboe <axboe@kernel.dk> Tested-by: NBart Van Assche <bvanassche@acm.org> Tested-by: NRobert Elliott <elliott@hp.com>
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- 18 7月, 2014 1 次提交
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由 Hannes Reinecke 提交于
The SCSI standard defines 64-bit values for LUNs, and large arrays employing large or hierarchical LUN numbers become more and more common. So update the linux SCSI stack to use 64-bit LUN numbers. Signed-off-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NChristoph Hellwig <hch@infradead.org> Reviewed-by: NEwan Milne <emilne@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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- 01 7月, 2014 1 次提交
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由 Alan Stern 提交于
Some buggy JMicron USB-ATA bridges don't know how to translate the FUA bit in READs or WRITEs. This patch adds an entry in unusual_devs.h and a blacklist flag to tell the sd driver not to use FUA. Signed-off-by: NAlan Stern <stern@rowland.harvard.edu> Reported-by: NMichael Büsch <m@bues.ch> Tested-by: NMichael Büsch <m@bues.ch> Acked-by: NJames Bottomley <James.Bottomley@HansenPartnership.com> CC: Matthew Dharm <mdharm-usb@one-eyed-alien.net> CC: <stable@vger.kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 10 4月, 2014 1 次提交
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由 Martin K. Petersen 提交于
cmd_flags in struct request is now 64 bits wide but the scsi_execute functions truncated arguments passed to int leading to errors. Make sure the flags parameters are u64. Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com> Cc: Jens Axboe <axboe@fb.com> CC: Jan Kara <jack@suse.cz> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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- 27 3月, 2014 1 次提交
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由 Hannes Reinecke 提交于
EVPD page 0x83 is used to uniquely identify the device. So instead of having each and every program issue a separate SG_IO call to retrieve this information it does make far more sense to display it in sysfs. Some older devices (most notably tapes) will only report reliable information in page 0x80 (Unit Serial Number). So export this in the sysfs attribute 'vpd_pg80'. [jejb: checkpatch fix] [hare: attach after transport configure] [fengguang.wu@intel.com: spotted problems with the original now fixed] Signed-off-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 16 3月, 2014 2 次提交
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由 James Bottomley 提交于
This patch eliminates the reap_ref and replaces it with a proper kref. On last put of this kref, the target is removed from visibility in sysfs. The final call to scsi_target_reap() for the device is done from __scsi_remove_device() and only if the device was made visible. This ensures that the target disappears as soon as the last device is gone rather than waiting until final release of the device (which is often too long). Reviewed-by: NAlan Stern <stern@rowland.harvard.edu> Tested-by: NSarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable@vger.kernel.org # delay backport by 2 months for field testing Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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由 Dan Williams 提交于
libsas sometimes short circuits timeouts to force commands into error recovery. It is misleading to log that the command timed-out in sas_scsi_timed_out() when in fact it was just queued for error handling. It's also redundant in the case of a true timeout as libata eh will detect and report timeouts via it's AC_ERR_TIMEOUT facility. Given that some environments consider "timeout" errors to be indicative of impending device failure demote the sas_scsi_timed_out() timeout message to be disabled by default. This parallels ata_scsi_timed_out(). [jejb: checkpatch fix] Reported-by: NXun Ni <xun.ni@intel.com> Tested-by: NNelson Cheng <nelson.cheng@intel.com> Acked-by: NLukasz Dorau <lukasz.dorau@intel.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 26 8月, 2013 1 次提交
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由 Ewan D. Milne 提交于
Generate a uevent when the following Unit Attention ASC/ASCQ codes are received: 2A/01 MODE PARAMETERS CHANGED 2A/09 CAPACITY DATA HAS CHANGED 38/07 THIN PROVISIONING SOFT THRESHOLD REACHED 3F/03 INQUIRY DATA HAS CHANGED 3F/0E REPORTED LUNS DATA HAS CHANGED Log kernel messages when the following Unit Attention ASC/ASCQ codes are received that are not as specific as those above: 2A/xx PARAMETERS CHANGED 3F/xx TARGET OPERATING CONDITIONS HAVE CHANGED Added logic to set expecting_lun_change for other LUNs on the target after REPORTED LUNS DATA HAS CHANGED is received, so that duplicate uevents are not generated, and clear expecting_lun_change when a REPORT LUNS command completes, in accordance with the SPC-3 specification regarding reporting of the 3F 0E ASC/ASCQ UA. [jejb: remove SPC3 test in scsi_report_lun_change and some docbook fixes and unused variable fix, both reported by Fengguang Wu] Signed-off-by: NEwan D. Milne <emilne@redhat.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 05 6月, 2013 1 次提交
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由 Martin K. Petersen 提交于
Introduce eh_timeout which can be used for error handling purposes. This was previously hardcoded to 10 seconds in the SCSI error handling code. However, for some fast-fail scenarios it is necessary to be able to tune this as it can take several iterations (bus device, target, bus, controller) before we give up. Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 07 5月, 2013 1 次提交
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由 Lin Ming 提交于
With the introduction of REQ_PM, modify sd's runtime suspend operation functions to use that flag so that the operations to put the device into runtime suspended state(i.e. sync cache and stop device) will not affect its runtime PM status. Signed-off-by: NLin Ming <ming.m.lin@intel.com> Signed-off-by: NAaron Lu <aaron.lu@intel.com> Acked-by: NAlan Stern <stern@rowland.harvard.edu> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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- 26 1月, 2013 2 次提交
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由 Aaron Lu 提交于
Commit 166a2967 "libata: tell scsi layer device supports runtime power off" introduced the can_power_off flag for scsi_device and is used to support ZPODD implementation in SCSI layer. Since ZPODD is now implemented in ATA layer, that flag is no longer needed, so remove it. Signed-off-by: NAaron Lu <aaron.lu@intel.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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由 Aaron Lu 提交于
When the ODD is powered off, any action the user did to the ODD that would generate a media event will trigger an ACPI interrupt, so the poll for media event is no longer necessary. And the poll will also cause a runtime status change, which will stop the ODD from staying in powered off state, so the poll should better be stopped. But since we don't have access to the gendisk structure in LLDs, here comes the disk_events_disable_depth for scsi device. This field is a hint set by LLDs to convey information to upper layer drivers. A value of 0 means media poll is necessary for the device, while values above 0 means media poll is not needed and should better be skipped. So we can increase its value when we are to power off the ODD in ATA layer and decrease its value when the ODD is powered on, effectively silence the media events poll. Signed-off-by: NAaron Lu <aaron.lu@intel.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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