| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 63/83] scsi: target: tcmu: reset_ring should reset TCMU_DEV_BIT_BROKEN | Date | Fri, 1 May 2020 15:23:42 +0200 |
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From: Bodo Stroesser <bstroesser@ts.fujitsu.com>
[ 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@ts.fujitsu.com Acked-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/target/target_core_user.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 35be1be87d2a1..9425354aef99c 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); -- 2.20.1
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