This is a note to let you know that I've just added the patch titled
scsi: Do not rescan devices with a suspended queue
to the 6.1-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:
scsi-do-not-rescan-devices-with-a-suspended-queue.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 626b13f015e080e434b1dee9a0c116ddbf4fb695 Mon Sep 17 00:00:00 2001
From: Damien Le Moal <dlemoal@xxxxxxxxxx>
Date: Wed, 4 Oct 2023 17:50:49 +0900
Subject: scsi: Do not rescan devices with a suspended queue
From: Damien Le Moal <dlemoal@xxxxxxxxxx>
commit 626b13f015e080e434b1dee9a0c116ddbf4fb695 upstream.
Commit ff48b37802e5 ("scsi: Do not attempt to rescan suspended devices")
modified scsi_rescan_device() to avoid attempting rescanning a suspended
device. However, the modification added a check to verify that a SCSI
device is in the running state without checking if the device request
queue (in the case of block device) is also running, thus allowing the
exectuion of internal requests. Without checking the device request
queue, commit ff48b37802e5 fix is incomplete and deadlocks on resume can
still happen. Use blk_queue_pm_only() to check if the device request
queue allows executing commands in addition to checking the SCSI device
state.
Reported-by: Petr Tesarik <petr@xxxxxxxxxxx>
Fixes: ff48b37802e5 ("scsi: Do not attempt to rescan suspended devices")
Cc: stable@xxxxxxxxxxxxxxx
Tested-by: Petr Tesarik <petr@xxxxxxxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/scsi_scan.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1619,12 +1619,13 @@ int scsi_rescan_device(struct scsi_devic
device_lock(dev);
/*
- * Bail out if the device is not running. Otherwise, the rescan may
- * block waiting for commands to be executed, with us holding the
- * device lock. This can result in a potential deadlock in the power
- * management core code when system resume is on-going.
+ * Bail out if the device or its queue are not running. Otherwise,
+ * the rescan may block waiting for commands to be executed, with us
+ * holding the device lock. This can result in a potential deadlock
+ * in the power management core code when system resume is on-going.
*/
- if (sdev->sdev_state != SDEV_RUNNING) {
+ if (sdev->sdev_state != SDEV_RUNNING ||
+ blk_queue_pm_only(sdev->request_queue)) {
ret = -EWOULDBLOCK;
goto unlock;
}
Patches currently in stable-queue which might be from dlemoal@xxxxxxxxxx are
queue-6.1/ata-libata-scsi-disable-scsi-device-manage_system_start_stop.patch
queue-6.1/scsi-do-not-rescan-devices-with-a-suspended-queue.patch
