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authorFinn Thain <fthain@telegraphics.com.au>2016-02-23 10:07:06 +1100
committerMartin K. Petersen <martin.petersen@oracle.com>2016-03-01 09:38:14 -0500
commit71a00593ec0c2e2c1720e4041cf2926ff1d07826 (patch)
treeb2ce847507a10dfc62cbdac8fb76809c6e62ac82 /drivers/scsi/atari_NCR5380.c
parent1678847ec93040ae8280d19c42ae0ba8a4233e6d (diff)
ncr5380: Dont re-enter NCR5380_select()
Calling NCR5380_select() from the abort handler causes various problems. Firstly, it means potentially re-entering NCR5380_select(). Secondly, it means that the lock is released, which permits the EH handlers to be re-entered. The combination results in crashes. Don't do it. Fixes: 8b00c3d5d40d ("ncr5380: Implement new eh_abort_handler") Reported-and-tested-by: Michael Schmitz <schmitzmic@gmail.com> Cc: <stable@vger.kernel.org> # 4.5 Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/atari_NCR5380.c')
-rw-r--r--drivers/scsi/atari_NCR5380.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/scsi/atari_NCR5380.c b/drivers/scsi/atari_NCR5380.c
index d382e71f4f4e..19a2fb3e6e7f 100644
--- a/drivers/scsi/atari_NCR5380.c
+++ b/drivers/scsi/atari_NCR5380.c
@@ -2497,6 +2497,9 @@ static bool list_del_cmd(struct list_head *haystack,
* If cmd was not found at all then presumably it has already been completed,
* in which case return SUCCESS to try to avoid further EH measures.
* If the command has not completed yet, we must not fail to find it.
+ *
+ * The lock protects driver data structures, but EH handlers also use it
+ * to serialize their own execution and prevent their own re-entry.
*/
static int NCR5380_abort(struct scsi_cmnd *cmd)
@@ -2533,14 +2536,11 @@ static int NCR5380_abort(struct scsi_cmnd *cmd)
if (list_del_cmd(&hostdata->disconnected, cmd)) {
dsprintk(NDEBUG_ABORT, instance,
"abort: removed %p from disconnected list\n", cmd);
- cmd->result = DID_ERROR << 16;
- if (!hostdata->connected)
- NCR5380_select(instance, cmd);
- if (hostdata->connected != cmd) {
- complete_cmd(instance, cmd);
- result = FAILED;
- goto out;
- }
+ /* Can't call NCR5380_select() and send ABORT because that
+ * means releasing the lock. Need a bus reset.
+ */
+ result = FAILED;
+ goto out;
}
if (hostdata->connected == cmd) {