linux-kernel - [RFC PATCH v1 1/2] block: bsg: resume scsi device before accessing

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Message-Id: <c04a11a590628c2497cef113b0dfea781de90416.1611719814.git.asutoshd@codeaurora.org>
Date:   Tue, 26 Jan 2021 20:00:22 -0800
From:   Asutosh Das <asutoshd@...eaurora.org>
To:     cang@...eaurora.org, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org
Cc:     Asutosh Das <asutoshd@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, stern@...land.harvard.edu,
        "Bao D . Nguyen" <nguyenb@...eaurora.org>,
        FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
        Jens Axboe <axboe@...nel.dk>,
        linux-block@...r.kernel.org (open list:BLOCK LAYER),
        linux-kernel@...r.kernel.org (open list)
Subject: [RFC PATCH v1 1/2] block: bsg: resume scsi device before accessing

Resumes the scsi device before accessing it.

Change-Id: I2929af60f2a92c89704a582fcdb285d35b429fde
Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
Signed-off-by: Can Guo <cang@...eaurora.org>
Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
---
 block/bsg.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/block/bsg.c b/block/bsg.c
index d7bae94..f4c197f 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -306,12 +306,16 @@ static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
 static int bsg_open(struct inode *inode, struct file *file)
 {
 	struct bsg_device *bd;
+	struct scsi_device *sd;
 
 	bd = bsg_get_device(inode, file);
 
 	if (IS_ERR(bd))
 		return PTR_ERR(bd);
 
+	sd = (struct scsi_device *) bd->queue->queuedata;
+	if (scsi_autopm_get_device(sd))
+		return -EIO;
 	file->private_data = bd;
 	return 0;
 }
@@ -319,8 +323,12 @@ static int bsg_open(struct inode *inode, struct file *file)
 static int bsg_release(struct inode *inode, struct file *file)
 {
 	struct bsg_device *bd = file->private_data;
+	struct scsi_device *sd;
 
 	file->private_data = NULL;
+	sd = (struct scsi_device *) bd->queue->queuedata;
+	scsi_autopm_put_device(sd);
+
 	return bsg_put_device(bd);
 }
 
-- 
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