Convert rough draft Marvell 6440 driver to a working driver.
Added support for SAS and SATA devices, hotplug, wide port, and expanders.
Signed-off-by: NKe Wei <kewei@marvell.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

The current sas_scsi_clear_queue_lu() is wrongly checking for commands
which match the pointer to the one passed in.  It should be checking for
commands which are on the same logical unit as the one passed in.  Fix
this by checking target pointer and LUN for equality.
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

The clear nexus I_T and clear nexus I_T_L functions in the aic94xx
specify the SUSPEND_TX flag which causes the sequencer to be suspended
until it receives a RESUME_TX.  Unfortunately, nothing ever sends the
resume, so the sequencer on the link is stopped forever, leading to
eventual timeouts and I/O errors.

Since clear nexus commands are only executed as part of error recovery,
it's perfectly fine to keep the sequencer running on the link ... as
soon as the recovery function is completed, we'll send it the commands
to retry.
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

Remove the now useless counting of adjacent pages from the debugging code in
to make it compile when DEBUG is set non-zero.
Signed-off-by: NKai Makisara <kai.makisara@kolumbus.fi>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

stex_internal_copy copies an in-kernel buffer to a sg list by using
scsi_kmap_atomic_sg. Some functions calls stex_internal_copy with
sg_count in struct st_ccb, which is the value that dma_map_sg
returned. However it might be shorter than the actual number of sg
entries (if the IOMMU merged the sg entries).

scsi_kmap_atomic_sg doesn't see sg->dma_length so stex_internal_copy
should be called with the actual number of sg entries
(i.e. scsi_sg_count), because if the sg entries were merged,
stex_direct_copy wrongly think that the data length in the sg list is
shorter than the actual length.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: NEd Lin <ed.lin@promise.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

stex_direct_copy copies an in-kernel buffer to a sg list in order to
spoof some SCSI commands. stex_direct_copy calls dma_map_sg and then
stex_internal_copy with the value that dma_map_sg returned. It calls
scsi_kmap_atomic_sg to copy data.

scsi_kmap_atomic_sg doesn't see sg->dma_length so if dma_map_sg merges
sg entries, stex_internal_copy gets the smaller number of sg entries
than the acutual number, which means it wrongly think that the data
length in the sg list is shorter than the actual length.

stex_direct_copy shouldn't call dma_map_sg and it doesn't need since
this code path doesn't involve dma transfers. This patch removes
stex_direct_copy and simply calls stex_internal_copy with the actual
number of sg entries.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: NEd Lin <ed.lin@promise.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

Commit 3163f725 introduced locking in
lpfc_sli_hbqbuf_fill_hbqs, but missed unlocking on one exit.
Reported-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NMatthew Wilcox <willy@linux.intel.com>
Acked-by: NJames Smart <james.smart@emulex.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

the check in the residual case has an incorrect test of scsi_status
(the logic is reversed, it should be scsi_status != 0 instead of
!scsi_status.  Since we checked a few lines above that scsi_status was
non-zero, just eliminate this test
Signed-off-by: NDavid C Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

The libsas error handler has two fairly fatal bugs

1. scsi_sas_task_done calls scsi_eh_finish_cmd() too early.  This
   happens if the task completes after it has been aborted but before
   the error handler starts up.  Because scsi_eh_finish_cmd()
   decrements host_failed and adds the task to the done list, the
   error handler start check (host_failed == host_busy) never passes
   and the eh never starts.

2. The multiple task completion paths sas_scsi_clear_queue_... all
   simply delete the task from the error queue.  This causes it to
   disappear into the ether, since a command must be placed on the
   done queue to be finished off by the error handler.  This behaviour
   causes the HBA to hang on pending commands.

Fix 1. by moving the SAS_TASK_STATE_ABORTED check to an exit clause at
the top of the routine and calling ->scsi_done() unconditionally (it
is a nop if the timer has fired).  This keeps the task in the error
handling queue until the eh starts.

Fix 2. by making sure every task goes through task complete followed
by scsi_eh_finish_cmd().

Tested this by firing resets across a disk running a hammer test (now
it actually survives without hanging the system)
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

arcmsr_iop_message_xfer() is called from atomic context under the
queuecommand scsi_host_template handler. James Bottomley pointed out
that the current GFP_KERNEL|GFP_DMA flags are wrong: firstly we are in
atomic context, secondly this memory is not used for DMA.
Also removed some unneeded casts.
Signed-off-by: NDaniel Drake <dsd@gentoo.org>
Cc: Nick Cheng <nick.cheng@areca.com.tw>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

ioc->name is used in the printk's after ioc has been freed.  Free
after prinks to fix this.

This patch fixes two use-after-free's introduced by
commit e78d5b8f and spotted by the
Coverity checker.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

This patch makes the following needlessly global functions static:
- __iscsi_unblock_session()
- iscsi_session_state_name()
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Acked-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

This patch makes the needlessly global lpfc_disable_node() static.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Acked-by: NJames Smart <James.Smart@Emulex.Com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

This fixes a bug that can't handle a passthru command with more than
two sg entries.

Big thanks to Tim Pepper for debugging the problem.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: NMark Salyzyn <Mark_Salyzyn@adaptec.com>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

The spinlock is held over too large a region: pscratch is a permanent
address (it's allocated at boot time and never changes).  All you need
the smp lock for is mediating the scratch in use flag, so fix this by
moving the spinlock into the case where we set the pscratch_busy flag
to false.

Cc: Stable Tree <stable@kernel.org>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

scsi/qla2xxx/qla_dfs.c: In function 'qla2x00_dfs_fce_show':
scsi/qla2xxx/qla_dfs.c:26: warning: format '%llx' expects type 'long long unsigned int', but argument 3 has type 'uint64_t'
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

The panic occurs if we get a MSGIN or MSGOUT for an unidentified SCB
(meaning we didn't identify the outstanding command it was for).  For
MSGIN this is wrong because it could be an unsolicited negotiation
MSGIN from the target.

Still panic on unsolicited MSGOUT because this would represent a
mistake in the negotiation phases.  However, we should fix this as
well.  The specs say we should go to bus free for unexpected msgin.
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

scsi_debug does at several places:

for_each_sg(sdb->table.sgl, sg, sdb->table.nents, k) {
	kaddr = (unsigned char *)
		kmap_atomic(sg_page(sg), KM_USER0);

We cannot do something like that with the clustering enabled (or we
can use scsi_kmap_atomic_sg).
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: NDouglas Gilbert <dougg@torque.net>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

Apparently the fix to [SCSI] fas216: Use scsi_eh API for REQUEST_SENSE
invocation didn't show up in the final version sent to linus.

Correct this omission.

Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

From conversations with the maintainers the _p isn't needed so kill it.
That removes the last non ISA _p user from the SCSI layer to my knowledge.
Signed-off-by: NAlan Cox <alan@redhat.com>
Acked-by: N"Yang, Bo" <Bo.Yang@lsi.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

Verified all the arches necessary select the CONFIG_64BIT symbol. This
also kills the warning (since it was using the 32-bit case) on parisc64
and mips64.
Signed-off-by: NKyle McMartin <kyle@mcmartin.ca>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

This driver has been failing under heavy load with

aic94xx: escb_tasklet_complete: REQ_TASK_ABORT, reason=0x6
aic94xx: escb_tasklet_complete: Can't find task (tc=4) to abort!

The second message is because the driver fails to identify the task
it's being asked to abort.  On closer inpection, there's a thinko in
the for each task loop over pending tasks in both the REQ_TASK_ABORT
and REQ_DEVICE_RESET cases where it doesn't look at the task on the
pending list but at the one on the ESCB (which is always NULL).

Fix by looking at the right task.  Also add a print for the case where
the pending SCB doesn't have a task attached.

Not sure if this will fix all the problems, but it's a definite first
step.

Cc: Stable Tree <stable@kernel.org>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

one system: initrd get courrupted:

RAMDISK: Compressed image found at block 0
RAMDISK: incomplete write (-28 != 2048) 134217728
crc error
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 388k freed
init_special_inode: bogus i_mode (177777)
Warning: unable to open an initial console.
init_special_inode: bogus i_mode (177777)
init_special_inode: bogus i_mode (177777)
Kernel panic - not syncing: No init found.  Try passing init= option to kernel.

bisected to
commit 9927c688
Author: James Bottomley <James.Bottomley@HansenPartnership.com>
Date:   Sun Feb 3 15:48:56 2008 -0600

    [SCSI] ses: add new Enclosure ULD

changes:
1. change char to unsigned char to avoid type change later.
2. preserve len for page1
3. need to move desc_ptr even the entry is not enclosure_component_device/raid.
   so keep desc_ptr on right position
4. record page7 len, and double check if desc_ptr out of boundary before touch.
5. fix typo in subenclosure checking: should use hdr_buf instead.

[jejb: style fixes]
Signed-off-by: NYinghai Lu <yinghai.lu@sun.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  ata: fix sparse warning in pata_acpi.c
  ata: fix sparse warning in pata_marvell.c
  ata: fix sparse warning in pata_jmicron.c
  ata: fix sparse warning in pata_cs5536.c
  ata: sparse fixes for pata_amd.c
  pata_scc.c: add thaw ops
  pata_cs5536.c bugfix
  pata_legacy: don't call ata_host_detach() after initialization failure
  ata: fix sparse warnings in sata_mv.c
  ata: fix sparse warning in sata_via.c
  ata: fix sparse warning in sata_promise.c
  ata: fix sparse warning in ata_piix.c
  ata: fix sparse warning in libata-core.c
  ata: make ata_scsiop_inq_89 static in libata-scsi.c

* 'hotfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  NFS: add missing spkm3 strings to mount option parser
  NFS: remove error field from nfs_readdir_descriptor_t
  NFS: missing spaces in KERN_WARNING
  NFS: Allow text-based mounts via compat_sys_mount
  NFS: fix reference counting for NFSv4 callback thread

drivers/ata/pata_acpi.c:80:2: warning: returning void-valued expression
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/ata/pata_marvell.c:88:2: warning: returning void-valued expression
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/ata/pata_jmicron.c:118:2: warning: returning void-valued expression
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Everybody passes in a u32...why fight it.

drivers/ata/pata_cs5536.c:124:26: warning: incorrect type in argument 3 (different signedness)
drivers/ata/pata_cs5536.c:124:26:    expected int *val
drivers/ata/pata_cs5536.c:124:26:    got unsigned int *<noident>
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drop return statement.
drivers/ata/pata_amd.c:149:2: warning: returning void-valued expression

Commit ce54d161 pata_amd: update mode selection for NV PATAs

added the initializer for nv_mode_filter but missed deleting the previously
set mode_filter

drivers/ata/pata_amd.c:509:3: warning: Initializer entry defined twice
drivers/ata/pata_amd.c:521:3:   also defined here
drivers/ata/pata_amd.c:544:3: warning: Initializer entry defined twice
drivers/ata/pata_amd.c:556:3:   also defined here
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

This patch adds default thaw ops and fixes the freeze/thaw inconsistency.
Signed-off-by: NKou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: NAkira Iguchi <akira2.iguchi@toshiba.co.jp>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Fix speed negotiation for secondary device.
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

ata_host_detach() detaches an attached port and shouldn't be called on
a port which hasn't been attached yet.  pata_legacy incorrectly calls
ata_host_detach() on unattached port after initialization failure
causing oops.  Fix it.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

pp is never used again in this function, no need to declare a
new one.

drivers/ata/sata_mv.c:1545:24: warning: symbol 'pp' shadows an earlier one
drivers/ata/sata_mv.c:1501:22: originally declared here
drivers/ata/sata_mv.c:1553:24: warning: symbol 'pp' shadows an earlier one
drivers/ata/sata_mv.c:1501:22: originally declared here
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/ata/sata_via.c:336:2: warning: returning void-valued expression
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/ata/sata_promise.c:546:15: warning: symbol 'len' shadows an earlier one
drivers/ata/sata_promise.c:538:6: originally declared here

len is set again immediately after the loop, so this is safe.
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/ata/ata_piix.c:1655:8: warning: symbol 'rc' shadows an earlier one
drivers/ata/ata_piix.c:1616:6: originally declared here
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

rc is used to test the return value and possibly return an error.
No need to redeclare inside the loop.

drivers/ata/libata-core.c:7089:7: warning: symbol 'rc' shadows an earlier one
drivers/ata/libata-core.c:7030:9: originally declared here
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>