4.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
commit 71a00593ec0c2e2c1720e4041cf2926ff1d07826 upstream.
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@xxxxxxxxx>
Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/NCR5380.c | 16 ++++++++--------
drivers/scsi/atari_NCR5380.c | 16 ++++++++--------
2 files changed, 16 insertions(+), 16 deletions(-)
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -2302,6 +2302,9 @@ static bool list_del_cmd(struct list_hea
* 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)
@@ -2338,14 +2341,11 @@ static int NCR5380_abort(struct scsi_cmn
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) {
--- a/drivers/scsi/atari_NCR5380.c
+++ b/drivers/scsi/atari_NCR5380.c
@@ -2497,6 +2497,9 @@ static bool list_del_cmd(struct list_hea
* 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_cmn
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) {
--
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