On Mon, Sep 14, 2009 at 11:50:50PM +0200, Jiri Slaby wrote:
> A potential problem here is rather that it may wait longer due to
> returning 1 jiffie. It's then timeout * 1000 * 1. On 250HZ system it
> makes a difference of multiple of 4. Don't think it's a real issue in
> those drivers at all, but it's worth fixing. Care to post a patch?
*sigh*. :) OK, last thing to be done this day.
Generated via precise copy&paste of the change between drivers
(which is a flashing warning that they likely contain too much c&p anyway),
plus:
for file in sn9c102/sn9c102_core.c et61x251/et61x251_core.c zc0301/zc0301_core.c; do diff -upN
linux-2.6.31/drivers/media/video/"$file" linux-2.6.31.patched/drivers/media/video/"$file" >>
/tmp/v4l2_drivers.diff; done
Disclaimer: FULLY UNTESTED, make sure to guard your hen house, use as dog food.
ChangeLog:
Correct dangerous and inefficient msecs_to_jiffies() calculation in some V4L2 drivers
Signed-off-by: Andreas Mohr <andi@xxxxxxxx>
--- linux-2.6.31/drivers/media/video/sn9c102/sn9c102_core.c 2009-09-10 00:13:59.000000000 +0200
+++ linux-2.6.31.patched/drivers/media/video/sn9c102/sn9c102_core.c 2009-09-14 23:58:27.000000000 +0200
@@ -1954,8 +1954,10 @@ sn9c102_read(struct file* filp, char __u
(!list_empty(&cam->outqueue)) ||
(cam->state & DEV_DISCONNECTED) ||
(cam->state & DEV_MISCONFIGURED),
- cam->module_param.frame_timeout *
- 1000 * msecs_to_jiffies(1) );
+ msecs_to_jiffies(
+ cam->module_param.frame_timeout * 1000
+ )
+ );
if (timeout < 0) {
mutex_unlock(&cam->fileop_mutex);
return timeout;
--- linux-2.6.31/drivers/media/video/et61x251/et61x251_core.c 2009-09-10 00:13:59.000000000 +0200
+++ linux-2.6.31.patched/drivers/media/video/et61x251/et61x251_core.c 2009-09-14 23:58:54.000000000 +0200
@@ -1379,8 +1379,10 @@ et61x251_read(struct file* filp, char __
(!list_empty(&cam->outqueue)) ||
(cam->state & DEV_DISCONNECTED) ||
(cam->state & DEV_MISCONFIGURED),
- cam->module_param.frame_timeout *
- 1000 * msecs_to_jiffies(1) );
+ msecs_to_jiffies(
+ cam->module_param.frame_timeout * 1000
+ )
+ );
if (timeout < 0) {
mutex_unlock(&cam->fileop_mutex);
return timeout;
--- linux-2.6.31/drivers/media/video/zc0301/zc0301_core.c 2009-09-10 00:13:59.000000000 +0200
+++ linux-2.6.31.patched/drivers/media/video/zc0301/zc0301_core.c 2009-09-15 00:00:14.000000000 +0200
@@ -819,8 +819,10 @@ zc0301_read(struct file* filp, char __us
(!list_empty(&cam->outqueue)) ||
(cam->state & DEV_DISCONNECTED) ||
(cam->state & DEV_MISCONFIGURED),
- cam->module_param.frame_timeout *
- 1000 * msecs_to_jiffies(1) );
+ msecs_to_jiffies(
+ cam->module_param.frame_timeout * 1000
+ )
+ );
if (timeout < 0) {
mutex_unlock(&cam->fileop_mutex);
return timeout;
--
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