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authorDan Williams <dan.j.williams@intel.com>2012-06-22 06:25:32 (GMT)
committerJames Bottomley <JBottomley@Parallels.com>2012-07-20 07:58:46 (GMT)
commit57fc2e335fd3c2f898ee73570dc81426c28dc7b4 (patch)
treef43508991715ad635c0b673185b2bf68de1ff674 /drivers/scsi/isci/remote_node_table.c
parente4a9c3732cea3e3c8c704aad86636090ffe6b25f (diff)
downloadlinux-57fc2e335fd3c2f898ee73570dc81426c28dc7b4.tar.xz
[SCSI] fix eh wakeup (scsi_schedule_eh vs scsi_restart_operations)
Rapid ata hotplug on a libsas controller results in cases where libsas is waiting indefinitely on eh to perform an ata probe. A race exists between scsi_schedule_eh() and scsi_restart_operations() in the case when scsi_restart_operations() issues i/o to other devices in the sas domain. When this happens the host state transitions from SHOST_RECOVERY (set by scsi_schedule_eh) back to SHOST_RUNNING and ->host_busy is non-zero so we put the eh thread to sleep even though ->host_eh_scheduled is active. Before putting the error handler to sleep we need to check if the host_state needs to return to SHOST_RECOVERY for another trip through eh. Since i/o that is released by scsi_restart_operations has been blocked for at least one eh cycle, this implementation allows those i/o's to run before another eh cycle starts to discourage hung task timeouts. Cc: <stable@vger.kernel.org> Reported-by: Tom Jackson <thomas.p.jackson@intel.com> Tested-by: Tom Jackson <thomas.p.jackson@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/isci/remote_node_table.c')
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