[PATCH 4.9 46/56] can: flex_can: Correct the checking for frame length in flexcan_start_xmit()
From: Greg Kroah-Hartman
Date: Fri Mar 02 2018 - 03:58:21 EST
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Luu An Phu <phu.luuan@xxxxxxx>
[ Upstream commit 13454c14550065fcc1705d6bd4ee6d40e057099f ]
The flexcan_start_xmit() function compares the frame length with data
register length to write frame content into data[0] and data[1]
register. Data register length is 4 bytes and frame maximum length is 8
bytes.
Fix the check that compares frame length with 3. Because the register
length is 4.
Signed-off-by: Luu An Phu <phu.luuan@xxxxxxx>
Reviewed-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/flexcan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -493,7 +493,7 @@ static int flexcan_start_xmit(struct sk_
data = be32_to_cpup((__be32 *)&cf->data[0]);
flexcan_write(data, ®s->mb[FLEXCAN_TX_BUF_ID].data[0]);
}
- if (cf->can_dlc > 3) {
+ if (cf->can_dlc > 4) {
data = be32_to_cpup((__be32 *)&cf->data[4]);
flexcan_write(data, ®s->mb[FLEXCAN_TX_BUF_ID].data[1]);
}