linux-kernel - [PATCH resend v3 3/5] libata-scsi: use u8 array to store mode page copy

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Message-ID: <57926727.840e420a.d7fc9.38dd@mx.google.com>
Date:	Sat, 23 Jul 2016 02:34:08 +0800
From:	tom.ty89@...il.com
To:	tj@...nel.org, hare@...e.de, sergei.shtylyov@...entembedded.com,
	arnd@...db.de
Cc:	sfr@...b.auug.org.au, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-next@...r.kernel.org, Tom Yan <tom.ty89@...il.com>
Subject: [PATCH resend v3 3/5] libata-scsi: use u8 array to store mode page copy

From: Tom Yan <tom.ty89@...il.com>

ata_mselect_*() would initialize a char array for storing a copy of
the current mode page. However, char could be signed char. In that
case, bytes larger than 127 would be converted to negative number.

For example, 0xff from def_control_mpage[] would become -1. This
prevented ata_mselect_control() from working at all, since when it
did the read-only bits check, there would always be a mismatch.

Signed-off-by: Tom Yan <tom.ty89@...il.com>

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 4a4e6f1..5cfcb4b 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3610,7 +3610,7 @@ static int ata_mselect_caching(struct ata_queued_cmd *qc,
 {
 	struct ata_taskfile *tf = &qc->tf;
 	struct ata_device *dev = qc->dev;
-	char mpage[CACHE_MPAGE_LEN];
+	u8 mpage[CACHE_MPAGE_LEN];
 	u8 wce, mask;
 	int i;
 
@@ -3668,7 +3668,7 @@ static int ata_mselect_control(struct ata_queued_cmd *qc,
 			       const u8 *buf, int len, u16 *fp)
 {
 	struct ata_device *dev = qc->dev;
-	char mpage[CONTROL_MPAGE_LEN];
+	u8 mpage[CONTROL_MPAGE_LEN];
 	u8 d_sense, mask;
 	int i;
 
-- 
2.9.0