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| author | Dan Williams <dan.j.williams@intel.com> | 2011-11-28 12:08:22 -0800 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-02-19 13:58:38 -0600 |
| commit | 3dff5721e4f67e6231dfc419d30aaa7563bfffd4 (patch) | |
| tree | 752102ef79f985f4d153b4791461404f67cdf467 /include/scsi | |
| parent | e500a34b0257def5b9ec07563afeeada1ead87bb (diff) | |
| download | op-kernel-dev-3dff5721e4f67e6231dfc419d30aaa7563bfffd4.zip op-kernel-dev-3dff5721e4f67e6231dfc419d30aaa7563bfffd4.tar.gz | |
[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 'include/scsi')
| -rw-r--r-- | include/scsi/libsas.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h index 9c13a5c0..10eb2ea 100644 --- a/include/scsi/libsas.h +++ b/include/scsi/libsas.h @@ -662,7 +662,6 @@ void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *); void sas_init_dev(struct domain_device *); void sas_task_abort(struct sas_task *); -int __sas_task_abort(struct sas_task *); int sas_eh_device_reset_handler(struct scsi_cmnd *cmd); int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd); |
