Commit c4a11827 authored by Matthew R. Ochs's avatar Matthew R. Ochs Committed by Martin K. Petersen

scsi: cxlflash: Fix context reference tracking on detach

Commit 888baf06 ("scsi: cxlflash: Add kref to context") introduced a
kref to the context. In particular, the detach routine was updated to
use the kref services for managing the removal and destruction of a
context.

As part of this change, the tracking mechanism internal to the detach
handler was refactored. This introduced a bug that can cause the
tracking state to be lost. This can lead to a situation where exclusive
access to a context is prematurely [and unknowingly] relinquished for
the executing thread.

To remedy, only update the tracking state when the kref operation
indicates the context was removed.

Fixes: 888baf06 ("scsi: cxlflash: Add kref to context")
Signed-off-by: default avatarMatthew R. Ochs <mrochs@linux.vnet.ibm.com>
Acked-by: default avatarUma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent f8013261
...@@ -912,7 +912,8 @@ static int _cxlflash_disk_detach(struct scsi_device *sdev, ...@@ -912,7 +912,8 @@ static int _cxlflash_disk_detach(struct scsi_device *sdev,
* Release the context reference and the sdev reference that * Release the context reference and the sdev reference that
* bound this LUN to the context. * bound this LUN to the context.
*/ */
put_ctx = !kref_put(&ctxi->kref, remove_context); if (kref_put(&ctxi->kref, remove_context))
put_ctx = false;
scsi_device_put(sdev); scsi_device_put(sdev);
out: out:
if (put_ctx) if (put_ctx)
......
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