media: tuner-xc2028: Don't use dynamic static allocation

commit 56ac033725ec93a45170caf3979eb2b1211a59a8 upstream.

Dynamic static allocation is evil, as Kernel stack is too low, and
compilation complains about it on some archs:
	drivers/media/tuners/tuner-xc2028.c:651:1: warning: 'load_firmware' 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 limit is 80, used only
on tm6000 driver. This limit is due to the size of the USB control URBs.
Ok, it would be theoretically possible to use a bigger size on PCI
devices, but the firmware load time is already good enough. Anyway,
if some usage requires more, it is just a matter of also increasing
the buffer size at load_firmware().

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/media/tuners/tuner-xc2028.c b/drivers/media/tuners/tuner-xc2028.c
index 878d2c4d9e8ef545d7f76bbda04f5d96ecf7fdbd..9771cd83c06e2a0d0c49666a36402734a1f493ff 100644 (file)
--- a/drivers/media/tuners/tuner-xc2028.c
+++ b/drivers/media/tuners/tuner-xc2028.c
@@ -24,6 +24,9 @@
 #include <linux/dvb/frontend.h>
 #include "dvb_frontend.h"
 
+/* Max transfer size done by I2C transfer functions */
+#define MAX_XFER_SIZE  80
+
 /* Registers (Write-only) */
 #define XREG_INIT         0x00
 #define XREG_RF_FREQ      0x02
@@ -547,7 +550,10 @@ static int load_firmware(struct dvb_frontend *fe, unsigned int type,
 {
        struct xc2028_data *priv = fe->tuner_priv;
        int                pos, rc;
-       unsigned char      *p, *endp, buf[priv->ctrl.max_len];
+       unsigned char      *p, *endp, buf[MAX_XFER_SIZE];
+
+       if (priv->ctrl.max_len > sizeof(buf))
+               priv->ctrl.max_len = sizeof(buf);
 
        tuner_dbg("%s called\n", __func__);