linux-kernel - [PATCH 5.18 0959/1095] scsi: ufs: core: Correct ufshcd

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Message-Id: <20220815180508.745559584@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:05:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stanley Chu <stanley.chu@...iatek.com>,
        Peter Wang <peter.wang@...iatek.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 5.18 0959/1095] scsi: ufs: core: Correct ufshcd_shutdown() flow

From: Peter Wang <peter.wang@...iatek.com>

commit 00511d2abf5708ad05dd5d1c36adb2468d274698 upstream.

After ufshcd_wl_shutdown() set device power off and link off,
ufshcd_shutdown() could turn off clock/power. Also remove
pm_runtime_get_sync.

The reason why it is safe to remove pm_runtime_get_sync() is because:

 - ufshcd_wl_shutdown() -> pm_runtime_get_sync() will resume hba->dev too.

 - device resume(turn on clk/power) is not required, even if device is in
   RPM_SUSPENDED.

Link: https://lore.kernel.org/r/20220727030526.31022-1-peter.wang@mediatek.com
Fixes: b294ff3e3449 ("scsi: ufs: core: Enable power management for wlun")
Cc: <stable@...r.kernel.org> # 5.15.x
Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>
Signed-off-by: Peter Wang <peter.wang@...iatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/ufs/ufshcd.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -9500,12 +9500,8 @@ EXPORT_SYMBOL(ufshcd_runtime_resume);
 int ufshcd_shutdown(struct ufs_hba *hba)
 {
 	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
-		goto out;
+		ufshcd_suspend(hba);
 
-	pm_runtime_get_sync(hba->dev);
-
-	ufshcd_suspend(hba);
-out:
 	hba->is_powered = false;
 	/* allow force shutdown even in case of errors */
 	return 0;