If hba_maxq equals poll_queues, which means there are no I/O queues
(HCTX_TYPE_DEFAULT, HCTX_TYPE_READ), the very first hw queue will be
allocated as HCTX_TYPE_POLL and it will be used as the dev_cmd_queue.
In this case, device commands such as QUERY cannot be properly handled.
This patch prevents the initialization of MCQ when the number of I/O
queues is not set and only the number of POLL queues is set.
Signed-off-by: Minwoo Im <minwoo.im@xxxxxxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
---
drivers/ufs/core/ufs-mcq.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 46faa54aea94..4bcae410c268 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -179,6 +179,15 @@ static int ufshcd_mcq_config_nr_queues(struct ufs_hba *hba)
return -EOPNOTSUPP;
}
+ /*
+ * Device should support at least one I/O queue to handle device
+ * commands via hba->dev_cmd_queue.
+ */
+ if (hba_maxq == poll_queues) {
+ dev_err(hba->dev, "At least one non-poll queue required\n");
+ return -EOPNOTSUPP;
+ }
+
rem = hba_maxq;
if (rw_queues) {
--
2.34.1
