linux-kernel - [PATCH] block: fix error handling in sg

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Message-Id: <1409062442-32766-1-git-send-email-sd@queasysnail.net>
Date:	Tue, 26 Aug 2014 16:14:02 +0200
From:	Sabrina Dubroca <sd@...asysnail.net>
To:	hch@....de
Cc:	linux-kernel@...r.kernel.org, axboe@...nel.dk,
	Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH] block: fix error handling in sg_io

Before commit 2cada584b200 ("block: cleanup error handling in sg_io"),
we had ret = 0 before entering the last big if block of sg_io.

Since 2cada584b200, ret = -EFAULT, which breaks hdparm:

/dev/sda:
 setting Advanced Power Management level to 0xc8 (200)
 HDIO_DRIVE_CMD failed: Bad address
 APM_level      = 128

Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
Fixes: 2cada584b200 ("block: cleanup error handling in sg_io")
---
 block/scsi_ioctl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 5dd477bfb4bc..9b8eaeca6a79 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -330,6 +330,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 	if (blk_fill_sghdr_rq(q, rq, hdr, mode))
 		goto out_free_cdb;
 
+	ret = 0;
 	if (hdr->iovec_count) {
 		size_t iov_data_len;
 		struct iovec *iov = NULL;
-- 
2.1.0

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