scsi: ufs: host: mediatek: Fix shutdown/suspend race condition

Address a race condition between shutdown and suspend operations in the
UFS Mediatek driver. Before entering suspend, check if a shutdown is in
progress to prevent conflicts and ensure system stability.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Acked-by: Chun-Hung Wu <chun-hung.wu@mediatek.com>
Link: https://patch.msgid.link/20250924094527.2992256-6-peter.wang@mediatek.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 2a69b4cede2225fa3a8a139ccfd4f0a5839a35af..c00e62adbbda80c44c7ca64017bbb7ca072f31c3 100644 (file)
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -2425,6 +2425,11 @@ static int ufs_mtk_system_suspend(struct device *dev)
        struct arm_smccc_res res;
        int ret;
 
+       if (hba->shutting_down) {
+               ret = -EBUSY;
+               goto out;
+       }
+
        ret = ufshcd_system_suspend(dev);
        if (ret)
                goto out;