This is a note to let you know that I've just added the patch titled scsi: target: tcmu: reset_ring should reset TCMU_DEV_BIT_BROKEN to the 5.6-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-target-tcmu-reset_ring-should-reset-tcmu_dev_bi.patch and it can be found in the queue-5.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 38e7ad33b3e62e84663e529baf8ce5fe5bed7920 Author: Bodo Stroesser <bstroesser@xxxxxxxxxxxxxx> Date: Thu Apr 9 12:10:26 2020 +0200 scsi: target: tcmu: reset_ring should reset TCMU_DEV_BIT_BROKEN [ Upstream commit 066f79a5fd6d1b9a5cc57b5cd445b3e4bb68a5b2 ] In case command ring buffer becomes inconsistent, tcmu sets device flag TCMU_DEV_BIT_BROKEN. If the bit is set, tcmu rejects new commands from LIO core with TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, and no longer processes completions from the ring. The reset_ring attribute can be used to completely clean up the command ring, so after reset_ring the ring no longer is inconsistent. Therefore reset_ring also should reset bit TCMU_DEV_BIT_BROKEN to allow normal processing. Link: https://lore.kernel.org/r/20200409101026.17872-1-bstroesser@xxxxxxxxxxxxxx Acked-by: Mike Christie <mchristi@xxxxxxxxxx> Signed-off-by: Bodo Stroesser <bstroesser@xxxxxxxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 0b9dfa6b17bc7..f769bb1e37356 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -2073,6 +2073,7 @@ static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) mb->cmd_tail = 0; mb->cmd_head = 0; tcmu_flush_dcache_range(mb, sizeof(*mb)); + clear_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); del_timer(&udev->cmd_timer);