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| author | Dan Williams | 2011-11-28 21:08:22 +0100 |
|---|---|---|
| committer | James Bottomley | 2012-02-19 20:58:38 +0100 |
| commit | 3dff5721e4f67e6231dfc419d30aaa7563bfffd4 (patch) | |
| tree | 752102ef79f985f4d153b4791461404f67cdf467 /crypto | |
| parent | [SCSI] libsas: kill invocation of scsi_eh_finish_cmd from sas_ata_task_done (diff) | |
| download | kernel-qcow2-linux-3dff5721e4f67e6231dfc419d30aaa7563bfffd4.tar.gz kernel-qcow2-linux-3dff5721e4f67e6231dfc419d30aaa7563bfffd4.tar.xz kernel-qcow2-linux-3dff5721e4f67e6231dfc419d30aaa7563bfffd4.zip | |
[SCSI] libsas: close error handling vs sas_ata_task_done() race
Since sas_ata does not implement ->freeze(), completions for scmds and
internal commands can still arrive concurrent with
ata_scsi_cmd_error_handler() and sas_ata_post_internal() respectively.
By the time either of those is called libata has committed to completing
the qc, and the ATA_PFLAG_FROZEN flag tells sas_ata_task_done() it has
lost the race.
In the sas_ata_post_internal() case we take on the additional
responsibility of freeing the sas_task to close the race with
sas_ata_task_done() freeing the the task while sas_ata_post_internal()
is in the process of invoking ->lldd_abort_task().
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions