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authorDavid Jeffery <djeffery@redhat.com>2022-03-11 21:43:59 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2022-03-15 21:01:28 +0300
commit733ab7e1b5d1041204c4ca7373f6e6f9d08e3283 (patch)
treeec31716096771578a1aec264f49e4ee79340276c /drivers/scsi/fnic
parent69ad4ef868c1fc7609daa235dfa46d28ba7a3ba3 (diff)
downloadlinux-733ab7e1b5d1041204c4ca7373f6e6f9d08e3283.tar.xz
scsi: fnic: Finish scsi_cmnd before dropping the spinlock
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>
Diffstat (limited to 'drivers/scsi/fnic')
-rw-r--r--drivers/scsi/fnic/fnic_scsi.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/scsi/fnic/fnic_scsi.c b/drivers/scsi/fnic/fnic_scsi.c
index 88c549f257db..40a52feb315d 100644
--- a/drivers/scsi/fnic/fnic_scsi.c
+++ b/drivers/scsi/fnic/fnic_scsi.c
@@ -986,8 +986,6 @@ static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
CMD_SP(sc) = NULL;
CMD_FLAGS(sc) |= FNIC_IO_DONE;
- spin_unlock_irqrestore(io_lock, flags);
-
if (hdr_status != FCPIO_SUCCESS) {
atomic64_inc(&fnic_stats->io_stats.io_failures);
shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
@@ -996,8 +994,6 @@ static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
fnic_release_ioreq_buf(fnic, io_req, sc);
- mempool_free(io_req, fnic->io_req_pool);
-
cmd_trace = ((u64)hdr_status << 56) |
(u64)icmnd_cmpl->scsi_status << 48 |
(u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
@@ -1021,6 +1017,12 @@ static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
} else
fnic->lport->host_stats.fcp_control_requests++;
+ /* Call SCSI completion function to complete the IO */
+ scsi_done(sc);
+ spin_unlock_irqrestore(io_lock, flags);
+
+ mempool_free(io_req, fnic->io_req_pool);
+
atomic64_dec(&fnic_stats->io_stats.active_ios);
if (atomic64_read(&fnic->io_cmpl_skip))
atomic64_dec(&fnic->io_cmpl_skip);
@@ -1049,9 +1051,6 @@ static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
if(io_duration_time > atomic64_read(&fnic_stats->io_stats.current_max_io_time))
atomic64_set(&fnic_stats->io_stats.current_max_io_time, io_duration_time);
}
-
- /* Call SCSI completion function to complete the IO */
- scsi_done(sc);
}
/* fnic_fcpio_itmf_cmpl_handler