linux-kernel - [PATCH 3.4 055/176] can: peak

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Message-Id: <1428569224-23820-55-git-send-email-lizf@kernel.org>
Date:	Thu,  9 Apr 2015 16:45:03 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Stephane Grosjean <s.grosjean@...k-system.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 055/176] can: peak_usb: fix memset() usage

From: Stephane Grosjean <s.grosjean@...k-system.com>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

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


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@...k-system.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 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 c95913a..5fe28be 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;
 	}
 
-- 
1.9.1

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