https://github.com/torvalds/linux
Revision 733ab7e1b5d1041204c4ca7373f6e6f9d08e3283 authored by David Jeffery on 11 March 2022, 18:43:59 UTC, committed by Martin K. Petersen on 15 March 2022, 18:01:28 UTC
When aborting a SCSI command through fnic, there is a race with the fnic interrupt handler which can result in the SCSI command and its request being completed twice. If the interrupt handler claims the command by setting CMD_SP to NULL first, the abort handler assumes the interrupt handler has completed the command and returns SUCCESS, causing the request for the scsi_cmnd to be re-queued. But the interrupt handler may not have finished the command yet. After it drops the spinlock protecting CMD_SP, it does memory cleanup before finally calling scsi_done() to complete the scsi_cmnd. If the call to scsi_done occurs after the abort handler finishes and re-queues the request, the completion of the scsi_cmnd will advance and try to double complete a request already queued for retry. This patch fixes the issue by moving scsi_done() and any other use of scsi_cmnd to before the spinlock is released by the interrupt handler. Link: https://lore.kernel.org/r/20220311184359.2345319-1-djeffery@redhat.com Reviewed-by: Laurence Oberman <loberman@redhat.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: David Jeffery <djeffery@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1 parent 69ad4ef
Tip revision: 733ab7e1b5d1041204c4ca7373f6e6f9d08e3283 authored by David Jeffery on 11 March 2022, 18:43:59 UTC
scsi: fnic: Finish scsi_cmnd before dropping the spinlock
scsi: fnic: Finish scsi_cmnd before dropping the spinlock
Tip revision: 733ab7e
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