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

[Asutosh Das]

Resumes the scsi device before accessing it.

Change-Id: I2929af60f2a92c89704a582fcdb285d35b429fde
Signed-off-by: Asutosh Das <asuto...@codeaurora.org>
Signed-off-by: Can Guo <c...@codeaurora.org>
Signed-off-by: Bao D. Nguyen <nguy...@codeaurora.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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