[PATCH v4 2/5] scsi: ufs: Move a clock scaling check

[Bart Van Assche <bvanassche@acm.org>]

Move a check related to clock scaling into ufshcd_devfreq_scale(). This
patch prepares for adding a second ufshcd_clock_scaling_prepare()
caller in a function not related to clock scaling.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/ufs/core/ufshcd.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 81c20e315dba..195261e3521c 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -1236,8 +1236,7 @@ static int ufshcd_clock_scaling_prepare(struct ufs_hba *hba)
 	ufshcd_scsi_block_requests(hba);
 	down_write(&hba->clk_scaling_lock);
 
-	if (!hba->clk_scaling.is_allowed ||
-	    ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US)) {
+	if (ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US)) {
 		ret = -EBUSY;
 		up_write(&hba->clk_scaling_lock);
 		ufshcd_scsi_unblock_requests(hba);
@@ -1275,10 +1274,18 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up)
 	int ret = 0;
 	bool is_writelock = true;
 
+	if (!hba->clk_scaling.is_allowed)
+		return -EBUSY;
+
 	ret = ufshcd_clock_scaling_prepare(hba);
 	if (ret)
 		return ret;
 
+	if (!hba->clk_scaling.is_allowed) {
+		ret = -EBUSY;
+		goto out_unprepare;
+	}
+
 	/* scale down the gear before scaling down clocks */
 	if (!scale_up) {
 		ret = ufshcd_scale_gear(hba, false);