linux-kernel - [PATCH 3/3] scsi: sd: add support for expect_media_change

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Date:   Mon, 11 Jan 2021 16:20:29 +0100
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     jejb@...ux.ibm.com, martin.petersen@...cle.com,
        stern@...land.harvard.edu, bvanassche@....org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martin Kepplinger <martin.kepplinger@...i.sm>
Subject: [PATCH 3/3] scsi: sd: add support for expect_media_change_suspend flag

Make the sd driver act appropriately when the user has set
expect_media_change_suspend for a device.

Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
---
 drivers/scsi/sd.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a3d2d4bc4a3d..ad89f8c76a27 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -608,7 +608,7 @@ static const struct dev_pm_ops sd_pm_ops = {
 	.poweroff		= sd_suspend_system,
 	.restore		= sd_resume,
 	.runtime_suspend	= sd_suspend_runtime,
-	.runtime_resume		= sd_resume,
+	.runtime_resume		= sd_resume_runtime,
 };
 
 static struct scsi_driver sd_template = {
@@ -3699,6 +3699,25 @@ static int sd_resume(struct device *dev)
 	return ret;
 }
 
+static int sd_resume_runtime(struct device *dev)
+{
+	struct scsi_disk *sdkp = dev_get_drvdata(dev);
+	int ret;
+
+	if (!sdkp)	/* E.g.: runtime resume at the start of sd_probe() */
+		return 0;
+
+	/*
+	 * expect_media_change_suspend is the userspace setting and
+	 * expecting_media_change is what is checked and cleared in the
+	 * error path if we set it here.
+	 */
+	if (sdkp->device->expect_media_change_suspend)
+		sdkp->device->expecting_media_change = 1;
+
+	return sd_resume(dev);
+}
+
 /**
  *	init_sd - entry point for this driver (both when built in or when
  *	a module).
-- 
2.20.1