[PATCH 3.16.y-ckt 092/216] can: peak_usb: fix memset() usage

From: Luis Henriques
Date: Mon Jan 12 2015 - 13:06:46 EST


3.16.7-ckt4 -stable review patch. If anyone has any objections, please let me know.

------------------

From: Stephane Grosjean <s.grosjean@xxxxxxxxxxxxxxx>

commit dc50ddcd4c58a5a0226038307d6ef884bec9f8c2 upstream.

This patchs fixes a misplaced call to memset() that fills the request
buffer with 0. The problem was with sending PCAN_USBPRO_REQ_FCT
requests, the content set by the caller was thus lost.

With this patch, the memory area is zeroed only when requesting info
from the device.

Signed-off-by: Stephane Grosjean <s.grosjean@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
index 263dd921edc4..f7f796a2c50b 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -333,8 +333,6 @@ static int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id,
if (!(dev->state & PCAN_USB_STATE_CONNECTED))
return 0;

- memset(req_addr, '\0', req_size);
-
req_type = USB_TYPE_VENDOR | USB_RECIP_OTHER;

switch (req_id) {
@@ -345,6 +343,7 @@ static int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id,
default:
p = usb_rcvctrlpipe(dev->udev, 0);
req_type |= USB_DIR_IN;
+ memset(req_addr, '\0', req_size);
break;
}

--
2.1.4

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