6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Naomi Chu <naomi.chu@xxxxxxxxxxxx>
[ Upstream commit defde5a50d91c74e1ce71a7f0bce7fb1ae311d84 ]
The UFSHCI 4.0 specification mandates that there should always be at least
one empty slot in each queue for distinguishing between full and empty
states. Enlarge 'hwq->max_entries' to 'DeviceQueueDepth + 1' to allow
UFSHCI 4.0 controllers to fully utilize MCQ queue slots.
Fixes: 4682abfae2eb ("scsi: ufs: core: mcq: Allocate memory for MCQ mode")
Signed-off-by: Naomi Chu <naomi.chu@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231102052426.12006-2-naomi.chu@xxxxxxxxxxxx
Reviewed-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Reviewed-by: Peter Wang <peter.wang@xxxxxxxxxxxx>
Reviewed-by: Chun-Hung <chun-hung.wu@xxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/ufs/core/ufs-mcq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 2ba8ec254dcee..5c75ab9d6bb50 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -436,7 +436,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
for (i = 0; i < hba->nr_hw_queues; i++) {
hwq = &hba->uhq[i];
- hwq->max_entries = hba->nutrs;
+ hwq->max_entries = hba->nutrs + 1;
spin_lock_init(&hwq->sq_lock);
spin_lock_init(&hwq->cq_lock);
mutex_init(&hwq->sq_mutex);
--
2.42.0
