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>
diff --git a/drivers/staging/most/hdm-usb/hdm_usb.c b/drivers/staging/most/hdm-usb/hdm_usb.c
index a4a3e26..feb4c82 100644
--- a/drivers/staging/most/hdm-usb/hdm_usb.c
+++ b/drivers/staging/most/hdm-usb/hdm_usb.c
@@ -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 @@
* @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");
}
/**
