scsi: lpfc: Prevent NDLP reference count underflow in dev_loss_tmo callback

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Current dev_loss_tmo handling checks whether there has been a previous
call to unregister with SCSI transport.  If so, the NDLP kref count is
decremented a second time in dev_loss_tmo as the final kref release.
However, this can sometimes result in a reference count underflow if
there is also a race to unregister with NVMe transport as well.  Add a
check for NVMe transport registration before decrementing the final
kref.  If NVMe transport is still registered, then the NVMe transport
unregistration is designated as the final kref decrement.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20241031223219.152342-8-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Justin Tee 2024-10-31 15:32:15 -07:00 • committed by Martin K. Petersen

parent eb038363d8

commit 4281f44ea8

1 changed files with 24 additions and 12 deletions

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drivers/scsi/lpfc/lpfc_hbadisc.c

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