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| author |   Matthew R. Ochs <mrochs@linux.vnet.ibm.com> | 2016-09-02 15:40:41 -0500 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2016-09-14 12:47:42 -0400 |
| commit | c4a11827b760ef8dcda26b5731d072b1d8fb7c81 (patch) | |
| tree | 6bda9df01ddca909ce2dd4f49e46e69c579062d2 /drivers/scsi/cxlflash/superpipe.c | |
| parent | scsi: cxlflash: Refactor WWPN setup (diff) | |
| download | linux-dev-c4a11827b760ef8dcda26b5731d072b1d8fb7c81.tar.xz linux-dev-c4a11827b760ef8dcda26b5731d072b1d8fb7c81.zip | |
scsi: cxlflash: Fix context reference tracking on detach
Commit 888baf069f49 ("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: 888baf069f49 ("scsi: cxlflash: Add kref to context")
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Acked-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/cxlflash/superpipe.c')
| -rw-r--r-- | drivers/scsi/cxlflash/superpipe.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/cxlflash/superpipe.c b/drivers/scsi/cxlflash/superpipe.c index c91fe6fe8d08..9636970d9611 100644 --- a/drivers/scsi/cxlflash/superpipe.c +++ b/drivers/scsi/cxlflash/superpipe.c @@ -912,7 +912,8 @@ static int _cxlflash_disk_detach(struct scsi_device *sdev, * Release the context reference and the sdev reference that * 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); out: if (put_ctx) |