linux-kernel - [PATCH v4 13/13] [SCSI] sr: make sure ODD is in resumed state in block ioctl

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Message-Id: <1338181720-4149-14-git-send-email-ming.m.lin@intel.com>
Date:	Mon, 28 May 2012 13:08:40 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Jeff Garzik <jgarzik@...ox.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Aaron Lu <aaron.lu@....com>, Holger Macht <holger@...ac.de>,
	Matthew Garrett <mjg@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: [PATCH v4 13/13] [SCSI] sr: make sure ODD is in resumed state in block ioctl

From: Aaron Lu <aaron.lu@....com>

When application tries to access the ODD's block device by ioctl,
make sure ODD is in an active state.

Signed-off-by: Aaron Lu <aaron.lu@....com>
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
 drivers/scsi/sr.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 72488c2..3da0879 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -654,6 +654,13 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 	void __user *argp = (void __user *)arg;
 	int ret;
 
+	/* Make sure the ODD is not suspended */
+	ret = pm_runtime_get_sync(&sdev->sdev_gendev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(&sdev->sdev_gendev);
+		return -EACCES;
+	}
+
 	mutex_lock(&sr_mutex);
 
 	/*
@@ -685,6 +692,8 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 
 out:
 	mutex_unlock(&sr_mutex);
+	pm_runtime_mark_last_busy(&cd->device->sdev_gendev);
+	pm_runtime_put_autosuspend(&cd->device->sdev_gendev);
 	return ret;
 }
 
-- 
1.7.2.5

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