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OpenCloudOS-Kernel
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Staging: most: fix doing DMA on stack 

This patch fixes error "doing DMA on the stack" by using kzalloc
for buffer allocation.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2015-07-30 18:18:55 +02:00 committed by Greg Kroah-Hartman
parent 3f78f6116d
commit 412c8232ed
1 changed files with 22 additions and 12 deletions
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34
drivers/staging/most/hdm-usb/hdm_usb.c
View File

@ -45,6 +45,7 @@
#define USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
#define USB_DEV_ID_INIC 0xCF18 /* PID: USB INIC */
#define HW_RESYNC 0x0000
/* DRCI Addresses */
#define DRCI_REG_NI_STATE 0x0100
#define DRCI_REG_PACKET_BW 0x0101
@ -140,20 +141,29 @@ static void wq_netinfo(struct work_struct *wq_obj);
* @dev: usb device
*
*/
static inline void trigger_resync_vr(struct usb_device *dev)
static void trigger_resync_vr(struct usb_device *dev)
{
int data = 0;
int retval;
u8 request_type = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT;
int *data = kzalloc(sizeof(*data), GFP_KERNEL);
if (0 > usb_control_msg(dev,
usb_sndctrlpipe(dev, 0),
0,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT,
0,
0,
&data,
0,
5 * HZ))
pr_info("Vendor request \"stall\" failed\n");
if (!data)
goto error;
*data = HW_RESYNC;
retval = usb_control_msg(dev,
usb_sndctrlpipe(dev, 0),
0,
request_type,
0,
0,
data,
0,
5 * HZ);
kfree(data);
if (retval >= 0)
return;
error:
pr_info("Vendor request \"stall\" failed\n");
}
/**