* Patch "ncr5380: Call scsi_eh_prep_cmnd() and scsi_eh_restore_cmnd() as and when appropriate" has been added to the 4.5-stable tree
@ 2016-04-09 23:45 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2016-04-09 23:45 UTC (permalink / raw)
To: fthain, gregkh, martin.petersen, schmitzmic; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
ncr5380: Call scsi_eh_prep_cmnd() and scsi_eh_restore_cmnd() as and when appropriate
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ncr5380-call-scsi_eh_prep_cmnd-and-scsi_eh_restore_cmnd-as-and-when-appropriate.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 8d5dbec3bcb24a7d071962448e0fecaca8c75cc7 Mon Sep 17 00:00:00 2001
From: Finn Thain <fthain@telegraphics.com.au>
Date: Tue, 23 Feb 2016 10:07:09 +1100
Subject: ncr5380: Call scsi_eh_prep_cmnd() and scsi_eh_restore_cmnd() as and when appropriate
From: Finn Thain <fthain@telegraphics.com.au>
commit 8d5dbec3bcb24a7d071962448e0fecaca8c75cc7 upstream.
This bug causes the wrong command to have its sense pointer overwritten,
which sometimes leads to a NULL pointer deref. Fix this by checking which
command is being requeued before restoring the scsi_eh_save data.
It turns out that some targets will disconnect a REQUEST SENSE command.
The autosense algorithm doesn't anticipate this. Hence multiple commands
can end up undergoing autosense simultaneously, and they will all try to
use the same scsi_eh_save struct, which won't work. Defer autosense when
the scsi_eh_save storage is in use by another command.
Fixes: f27db8eb98a1 ("ncr5380: Fix autosense bugs")
Reported-and-tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/scsi/NCR5380.c | 4 ++--
drivers/scsi/atari_NCR5380.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -760,7 +760,7 @@ static struct scsi_cmnd *dequeue_next_cm
struct NCR5380_cmd *ncmd;
struct scsi_cmnd *cmd;
- if (list_empty(&hostdata->autosense)) {
+ if (hostdata->sensing || list_empty(&hostdata->autosense)) {
list_for_each_entry(ncmd, &hostdata->unissued, list) {
cmd = NCR5380_to_scmd(ncmd);
dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n",
@@ -793,7 +793,7 @@ static void requeue_cmd(struct Scsi_Host
struct NCR5380_hostdata *hostdata = shost_priv(instance);
struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
- if (hostdata->sensing) {
+ if (hostdata->sensing == cmd) {
scsi_eh_restore_cmnd(cmd, &hostdata->ses);
list_add(&ncmd->list, &hostdata->autosense);
hostdata->sensing = NULL;
--- a/drivers/scsi/atari_NCR5380.c
+++ b/drivers/scsi/atari_NCR5380.c
@@ -862,7 +862,7 @@ static struct scsi_cmnd *dequeue_next_cm
struct NCR5380_cmd *ncmd;
struct scsi_cmnd *cmd;
- if (list_empty(&hostdata->autosense)) {
+ if (hostdata->sensing || list_empty(&hostdata->autosense)) {
list_for_each_entry(ncmd, &hostdata->unissued, list) {
cmd = NCR5380_to_scmd(ncmd);
dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n",
@@ -901,7 +901,7 @@ static void requeue_cmd(struct Scsi_Host
struct NCR5380_hostdata *hostdata = shost_priv(instance);
struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
- if (hostdata->sensing) {
+ if (hostdata->sensing == cmd) {
scsi_eh_restore_cmnd(cmd, &hostdata->ses);
list_add(&ncmd->list, &hostdata->autosense);
hostdata->sensing = NULL;
Patches currently in stable-queue which might be from fthain@telegraphics.com.au are
queue-4.5/ncr5380-correctly-clear-command-pointers-and-lists-after-bus-reset.patch
queue-4.5/ncr5380-call-scsi_eh_prep_cmnd-and-scsi_eh_restore_cmnd-as-and-when-appropriate.patch
queue-4.5/ncr5380-forget-aborted-commands.patch
queue-4.5/ncr5380-dont-release-lock-for-pio-transfer.patch
queue-4.5/ncr5380-dont-re-enter-ncr5380_select.patch
queue-4.5/ncr5380-fix-ncr5380_select-eh-checks-and-result-handling.patch
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2016-04-09 23:45 Patch "ncr5380: Call scsi_eh_prep_cmnd() and scsi_eh_restore_cmnd() as and when appropriate" has been added to the 4.5-stable tree gregkh
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