[PATCH v2] scsi: sd: Do not repeat the starting disk message

[Damien Le Moal <dlemoal@kernel.org>]

The scsi disk message "Starting disk" to signal resuming of a suspended
disk is printed in both sd_resume() and sd_resume_common(), which
results in this message being printed twice when resuming from e.g.
autosuspend:

$ echo 5000 > /sys/block/sda/device/power/autosuspend_delay_ms
$ echo auto > /sys/block/sda/device/power/control

[ 4962.438293] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[ 4962.501121] sd 0:0:0:0: [sda] Stopping disk

$ echo on > /sys/block/sda/device/power/control

[ 4972.805851] sd 0:0:0:0: [sda] Starting disk
[ 4980.558806] sd 0:0:0:0: [sda] Starting disk

Fix this double print by removing the call to sd_printk() from
sd_resume() and moving the call to sd_printk() in sd_resume_common()
earlier in the function, before the check using sd_do_start_stop().
Doing so, the message is printed once regardless if sd_resume_common()
actually executes sd_start_stop_device() (i.e. scsi device case) or not
(libsas and libata managed ATA devices case).

Fixes: 0c76106cb975 ("scsi: sd: Fix TCG OPAL unlock on system resume")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
---

Changes from v1:
 - Fixed typo in commit message
 - Added Bart's review tag

 drivers/scsi/sd.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 6b64af7d4927..1b7561abe05d 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -4119,8 +4119,6 @@ static int sd_resume(struct device *dev)
 {
 	struct scsi_disk *sdkp = dev_get_drvdata(dev);
 
-	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
-
 	if (opal_unlock_from_suspend(sdkp->opal_dev)) {
 		sd_printk(KERN_NOTICE, sdkp, "OPAL unlock failed\n");
 		return -EIO;
@@ -4137,12 +4135,13 @@ static int sd_resume_common(struct device *dev, bool runtime)
 	if (!sdkp)	/* E.g.: runtime resume at the start of sd_probe() */
 		return 0;
 
+	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
+
 	if (!sd_do_start_stop(sdkp->device, runtime)) {
 		sdkp->suspended = false;
 		return 0;
 	}
 
-	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
 	ret = sd_start_stop_device(sdkp, 1);
 	if (!ret) {
 		sd_resume(dev);
-- 
2.45.2