[SCSI] libsas: Reset timer on taskless scsi_cmnds in sas_scsi_timed_out

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Every so often, a scsi_cmnd will time out, and the libsas timeout handler
will discover that the scsi_cmnd does not have a sas_task attached to it.
This can happen in two cases: (1) the scsi_cmnd actually made it through
libsas to the HBA and is now going through scsi_done, or (2) the
scsi_cmnd has been held up (host lock, slab alloc, etc) and libsas has
not yet attached a sas_task.  In both cases, it is safe to ask SCSI for
more time to process the command via EH_RESET_TIMER; we cannot blindly
return EH_HANDLED because if (2) happens, we could end up calling
scsi_done while another CPU is heading towards sas_queuecommand, which
causes slab corruption when sas_task_done updates the freed scsi_cmnd.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

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Darrick J. Wong 2007-01-11 14:15:00 -08:00 • committed by James Bottomley

parent acbf167d4a

commit 6d4dcd4dae

1 changed files with 7 additions and 3 deletions

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drivers/scsi/libsas/sas_scsi_host.c

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