scsi: ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1

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: 4682abf ("scsi: ufs: core: mcq: Allocate memory for MCQ mode")
Signed-off-by: Naomi Chu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Stanley Chu <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Reviewed-by: Peter Wang <[email protected]>
Reviewed-by: Chun-Hung <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Naomi Chu

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);