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[media] av7110_hw: Don't use dynamic static allocation 

Dynamic static allocation is evil, as Kernel stack is too low, and
compilation complains about it on some archs:
	drivers/media/pci/ttpci/av7110_hw.c:510:1: warning: 'av7110_fw_cmd' uses dynamic stack allocation [enabled by default]
Instead, let's enforce a limit for the buffer.
In the specific case of this driver, the maximum fw command size
is 6 + 2, as checked using:
	$ git grep -A1 av7110_fw_cmd drivers/media/pci/ttpci/
So, use 8 for the buffer size.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2013-11-02 05:51:59 -03:00
parent f7a35df15b
commit 5bf30b3bc4
1 changed files with 17 additions and 2 deletions
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19
drivers/media/pci/ttpci/av7110_hw.c
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@ -22,7 +22,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
*
* the project's page is at http://www.linuxtv.org/
* the project's page is at http://www.linuxtv.org/
*/
/* for debugging ARM communication: */
@ -40,6 +40,14 @@
#define _NOHANDSHAKE
/*
* Max transfer size done by av7110_fw_cmd()
*
* The maximum size passed to this function is 6 bytes. The buffer also
* uses two additional ones for type and size. So, 8 bytes is enough.
*/
#define MAX_XFER_SIZE 8
/****************************************************************************
* DEBI functions
****************************************************************************/
@ -488,11 +496,18 @@ static int av7110_send_fw_cmd(struct av7110 *av7110, u16* buf, int length)
int av7110_fw_cmd(struct av7110 *av7110, int type, int com, int num, ...)
{
va_list args;
u16 buf[num + 2];
u16 buf[MAX_XFER_SIZE];
int i, ret;
// dprintk(4, "%p\n", av7110);
if (2 + num > sizeof(buf)) {
printk(KERN_WARNING
"%s: %s len=%d is too big!\n",
KBUILD_MODNAME, __func__, num);
return -EINVAL;
}
buf[0] = ((type << 8) | com);
buf[1] = num;