Skip to content

cloud-kernel
cloud-kernel

openanolis / cloud-kernel
1 年多 前同步成功

通知 160
Star 36
Fork 7
cloud-kernel
cloud-kernel
切换分支/标签
  1. 09 11月, 2016 2 次提交
  3. 02 11月, 2016 1 次提交
    • B
      scsi: qla2xxx: Fix scsi scan hang triggered if adapter fails during init · a5dd506e
      由 Bill Kuzeja 提交于 
      A system can get hung task timeouts if a qlogic board fails during
initialization (if the board breaks again or fails the init). The hang
involves the scsi scan.

In a nutshell, since commit beb9e315 ("qla2xxx: Prevent removal and
board_disable race"):

...it is possible to have freed ha (base_vha->hw) early by a call to
qla2x00_remove_one when pdev->enable_cnt equals zero:

       if (!atomic_read(&pdev->enable_cnt)) {
               scsi_host_put(base_vha->host);
               kfree(ha);
               pci_set_drvdata(pdev, NULL);
               return;

Almost always, the scsi_host_put above frees the vha structure
(attached to the end of the Scsi_Host we're putting) since it's the last
put, and life is good.  However, if we are entering this routine because
the adapter has broken sometime during initialization AND a scsi scan is
already in progress (and has done its own scsi_host_get), vha will not
be freed. What's worse, the scsi scan will access the freed ha structure
through qla2xxx_scan_finished:

        if (time > vha->hw->loop_reset_delay * HZ)
                return 1;

The scsi scan keeps checking to see if a scan is complete by calling
qla2xxx_scan_finished. There is a timeout value that limits the length
of time a scan can take (hw->loop_reset_delay, usually set to 5
seconds), but this definition is in the data structure (hw) that can get
freed early.

This can yield unpredictable results, the worst of which is that the
scsi scan can hang indefinitely. This happens when the freed structure
gets reused and loop_reset_delay gets overwritten with garbage, which
the scan obliviously uses as its timeout value.

The fix for this is simple: at the top of qla2xxx_scan_finished, check
for the UNLOADING bit in the vha structure (_vha is not freed at this
point).  If UNLOADING is set, we exit the scan for this adapter
immediately. After this last reference to the ha structure, we'll exit
the scan for this adapter, and continue on.

This problem is hard to hit, but I have run into it doing negative
testing many times now (with a test specifically designed to bring it
out), so I can verify that this fix works. My testing has been against a
RHEL7 driver variant, but the bug and patch are equally relevant to to
the upstream driver.

Fixes: beb9e315 ("qla2xxx: Prevent removal and board_disable race")
Cc: <stable@vger.kernel.org> # v3.18+
Signed-off-by: NBill Kuzeja <william.kuzeja@stratus.com>
Acked-by: NHimanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
      a5dd506e
  5. 31 8月, 2016 1 次提交
  7. 09 8月, 2016 1 次提交
  9. 16 7月, 2016 5 次提交
  11. 24 2月, 2016 2 次提交
  13. 07 2月, 2016 1 次提交
    • Q
      qla2xxx: Fix stale pointer access. · cb43285f
      由 Quinn Tran 提交于 
      [ Upstream Commit 84e32a06 ]

Commit 84e32a06 ("qla2xxx: Use pci_enable_msix_range() instead of
pci_enable_msix()") introduced a regression when target mode is enabled.
In qla24xx_enable_msix(), ha->max_rsp_queues was incorrectly set
to a value higher than the number of response queues allocated causing
an invalid dereference. Specifically here in qla2x00_init_rings():
    *rsp->in_ptr = 0;

Add additional check to make sure the pointer is valid. following
call stack will be seen

---- 8< ----
RIP: 0010:[<ffffffffa02ccadc>]  [<ffffffffa02ccadc>] qla2x00_init_rings+0xdc/0x320 [qla2xxx]
RSP: 0018:ffff880429447dd8  EFLAGS: 00010082
....
Call Trace:
[<ffffffffa02ceb40>] qla2x00_abort_isp+0x170/0x6b0 [qla2xxx]
[<ffffffffa02c6f77>] qla2x00_do_dpc+0x357/0x7f0 [qla2xxx]
[<ffffffffa02c6c20>] ? qla2x00_relogin+0x260/0x260 [qla2xxx]
[<ffffffff8107d2c9>] kthread+0xc9/0xe0
[<ffffffff8107d200>] ? flush_kthread_worker+0x90/0x90
[<ffffffff8172cc6f>] ret_from_fork+0x3f/0x70
[<ffffffff8107d200>] ? flush_kthread_worker+0x90/0x90
---- 8< ----

Cc: <stable@vger.kernel.org>
Signed-off-by: NQuinn Tran <quinn.tran@qlogic.com>
Signed-off-by: NHimanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>
      cb43285f
  15. 08 1月, 2016 7 次提交
  17. 19 11月, 2015 1 次提交
  19. 10 11月, 2015 1 次提交
  21. 27 8月, 2015 7 次提交
  23. 25 7月, 2015 4 次提交
  25. 13 6月, 2015 1 次提交
  27. 10 4月, 2015 1 次提交
  29. 07 3月, 2015 2 次提交
  31. 06 1月, 2015 1 次提交
    • B
      qla2xxx: fix busy wait regression · 975f7d46
      由 Bruno Prémont 提交于 
      Commit e05fe292 (qla2xxx: Honor FCP_RSP retry delay timer field.)
causes systems to busy-wait for about 3 minutes after boot prior to
detecting SAN disks.

During this wait period one kworker is running full-time
(though /proc/<pid>/stack has no useful data). Another kworker is
waiting for IO to complete during that whole time period.

Looking at drivers/scsi/qla2xxx/qla_os.c, fcport->retry_delay_timestamp
has a special value of 0 though that 0 value forces system to wait when
jiffies is very large value (e.g. 4294952605 - "negative" value when
signed on 32bit systems).
Signed-off-by: NBruno Prémont <bonbons@linux-vserver.org>
Acked-by: NChad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
      975f7d46
  33. 04 12月, 2014 1 次提交
  35. 24 11月, 2014 1 次提交