This is a note to let you know that I've just added the patch titled
media: tuner-xc2028: Don't use dynamic static allocation
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-tuner-xc2028-don-t-use-dynamic-static-allocation.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 56ac033725ec93a45170caf3979eb2b1211a59a8 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Date: Sat, 2 Nov 2013 06:13:11 -0300
Subject: media: tuner-xc2028: Don't use dynamic static allocation
From: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Reviewed-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/tuners/tuner-xc2028.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- 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_fron
{
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__);
Patches currently in stable-queue which might be from m.chehab@xxxxxxxxxxx are
queue-3.12/media-af9015-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-dw2102-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-af9035-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-stb0899_drv-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-dibusb-common-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-cx18-struct-i2c_client-is-too-big-for-stack.patch
queue-3.12/media-tuner-xc2028-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-cimax2-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-tuners-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-v4l2-async-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-dvb-frontends-again-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-dvb-frontends-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-stv090x-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-s5h1420-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-av7110_hw-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-stv0367-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-lirc_zilog-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-cxusb-don-t-use-dynamic-static-allocation.patch
queue-3.12/media-mxl111sf-don-t-use-dynamic-static-allocation.patch
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