linux-kernel - [PATCH] scsi: sd: fix sd shutdown to issue START STOP UNIT command appropriately

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Message-ID: <20250724203805.93944-1-salomondush@google.com>
Date: Thu, 24 Jul 2025 20:38:05 +0000
From: Salomon Dushimirimana <salomondush@...gle.com>
To: "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>, 
	"Martin K . Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Vishakha Channapattan <vishakhavc@...gle.com>, Salomon Dushimirimana <salomondush@...gle.com>
Subject: [PATCH] scsi: sd: fix sd shutdown to issue START STOP UNIT command appropriately

Commit aa3998dbeb3a ("ata: libata-scsi: Disable scsi device
manage_system_start_stop") enabled libata EH to manage device power mode
trasitions for system suspend/resume and removed the flag from
ata_scsi_dev_config. However, since the sd_shutdown() function still
relies on the manage_system_start_stop flag, a spin-down command is not
issued to the disk with command "echo 1 > /sys/block/sdb/device/delete"

sd_shutdown() can be called for both system/runtime start stop
operations, so utilize the manage_run_time_start_stop flag set in the
ata_scsi_dev_config and issue a spin-down command during disk removal
when the system is running. This is in addition to when the system is
powering off and manage_shutdown flag is set. The
manage_system_start_stop flag will still be used for drivers that still
set the flag.

Signed-off-by: Salomon Dushimirimana <salomondush@...gle.com>
---
 drivers/scsi/sd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index eeaa6af294b81..282000c761f8e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -4173,7 +4173,9 @@ static void sd_shutdown(struct device *dev)
 	if ((system_state != SYSTEM_RESTART &&
 	     sdkp->device->manage_system_start_stop) ||
 	    (system_state == SYSTEM_POWER_OFF &&
-	     sdkp->device->manage_shutdown)) {
+	     sdkp->device->manage_shutdown) ||
+	    (system_state == SYSTEM_RUNNING &&
+	     sdkp->device->manage_runtime_start_stop)) {
 		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
 		sd_start_stop_device(sdkp, 0);
 	}
-- 
2.50.1.470.g6ba607880d-goog