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scsi: target: tcmu: reset_ring should reset TCMU_DEV_BIT_BROKEN

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[ 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/[email protected]
Acked-by: Mike Christie <[email protected]>
Signed-off-by: Bodo Stroesser <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Bodo Stroesser 2020-04-09 12:10:26 +02:00 • committed by Greg Kroah-Hartman
commit 1cc2460dad
1 changed files with 1 additions and 0 deletions
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1
drivers/target/target_core_user.c
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@ -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);