[media] usbvision: fix DMA from stack warnings

In various places the stack was used to provide buffers for USB data, but
this should be allocated memory.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/usb/usbvision/usbvision-core.c b/drivers/media/usb/usbvision/usbvision-core.c
index ec50984..9f4e630 100644 (file)
--- a/drivers/media/usb/usbvision/usbvision-core.c
+++ b/drivers/media/usb/usbvision/usbvision-core.c
@@ -1367,7 +1367,7 @@ static void usbvision_isoc_irq(struct urb *urb)
 int usbvision_read_reg(struct usb_usbvision *usbvision, unsigned char reg)
 {
        int err_code = 0;
-       unsigned char buffer[1];
+       unsigned char *buffer = usbvision->ctrl_urb_buffer;
 
        if (!USBVISION_IS_OPERATIONAL(usbvision))
                return -1;
@@ -1401,10 +1401,12 @@ int usbvision_write_reg(struct usb_usbvision *usbvision, unsigned char reg,
        if (!USBVISION_IS_OPERATIONAL(usbvision))
                return 0;
 
+       usbvision->ctrl_urb_buffer[0] = value;
        err_code = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
                                USBVISION_OP_CODE,
                                USB_DIR_OUT | USB_TYPE_VENDOR |
-                               USB_RECIP_ENDPOINT, 0, (__u16) reg, &value, 1, HZ);
+                               USB_RECIP_ENDPOINT, 0, (__u16) reg,
+                               usbvision->ctrl_urb_buffer, 1, HZ);
 
        if (err_code < 0) {
                dev_err(&usbvision->dev->dev,
@@ -1596,7 +1598,7 @@ static int usbvision_init_webcam(struct usb_usbvision *usbvision)
                { 0x27, 0x00, 0x00 }, { 0x28, 0x00, 0x00 }, { 0x29, 0x00, 0x00 }, { 0x08, 0x80, 0x60 },
                { 0x0f, 0x2d, 0x24 }, { 0x0c, 0x80, 0x80 }
        };
-       char value[3];
+       unsigned char *value = usbvision->ctrl_urb_buffer;
 
        /* the only difference between PAL and NTSC init_values */
        if (usbvision_device_data[usbvision->dev_model].video_norm == V4L2_STD_NTSC)
@@ -1635,8 +1637,8 @@ static int usbvision_init_webcam(struct usb_usbvision *usbvision)
 static int usbvision_set_video_format(struct usb_usbvision *usbvision, int format)
 {
        static const char proc[] = "usbvision_set_video_format";
+       unsigned char *value = usbvision->ctrl_urb_buffer;
        int rc;
-       unsigned char value[2];
 
        if (!USBVISION_IS_OPERATIONAL(usbvision))
                return 0;
@@ -1677,7 +1679,7 @@ int usbvision_set_output(struct usb_usbvision *usbvision, int width,
        int err_code = 0;
        int usb_width, usb_height;
        unsigned int frame_rate = 0, frame_drop = 0;
-       unsigned char value[4];
+       unsigned char *value = usbvision->ctrl_urb_buffer;
 
        if (!USBVISION_IS_OPERATIONAL(usbvision))
                return 0;
@@ -1872,7 +1874,7 @@ static int usbvision_set_compress_params(struct usb_usbvision *usbvision)
 {
        static const char proc[] = "usbvision_set_compresion_params: ";
        int rc;
-       unsigned char value[6];
+       unsigned char *value = usbvision->ctrl_urb_buffer;
 
        value[0] = 0x0F;    /* Intra-Compression cycle */
        value[1] = 0x01;    /* Reg.45 one line per strip */
@@ -1946,7 +1948,7 @@ int usbvision_set_input(struct usb_usbvision *usbvision)
 {
        static const char proc[] = "usbvision_set_input: ";
        int rc;
-       unsigned char value[8];
+       unsigned char *value = usbvision->ctrl_urb_buffer;
        unsigned char dvi_yuv_value;
 
        if (!USBVISION_IS_OPERATIONAL(usbvision))
@@ -2062,8 +2064,8 @@ int usbvision_set_input(struct usb_usbvision *usbvision)
 
 static int usbvision_set_dram_settings(struct usb_usbvision *usbvision)
 {
+       unsigned char *value = usbvision->ctrl_urb_buffer;
        int rc;
-       unsigned char value[8];
 
        if (usbvision->isoc_mode == ISOC_MODE_COMPRESS) {
                value[0] = 0x42;

diff --git a/drivers/media/usb/usbvision/usbvision-i2c.c b/drivers/media/usb/usbvision/usbvision-i2c.c
index 26dbcb1..120de2e 100644 (file)
--- a/drivers/media/usb/usbvision/usbvision-i2c.c
+++ b/drivers/media/usb/usbvision/usbvision-i2c.c
@@ -343,7 +343,7 @@ static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
 {
        int rc, retries;
        int i;
-       unsigned char value[6];
+       unsigned char *value = usbvision->ctrl_urb_buffer;
        unsigned char ser_cont;
 
        ser_cont = (len & 0x07) | 0x10;