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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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| .. | ||
| Kconfig | ||
| Makefile | ||
| sas_discover.c | ||
| sas_dump.c | ||
| sas_dump.h | ||
| sas_event.c | ||
| sas_expander.c | ||
| sas_init.c | ||
| sas_internal.h | ||
| sas_phy.c | ||
| sas_port.c | ||
| sas_scsi_host.c | ||