Re: [hg:v4l-dvb] cx88: Prevent general protection fault on rmmod

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On Wed, 11 Mar 2009 10:19:52 +0100
Jean Delvare <khali@xxxxxxxxxxxx> wrote:

> On Wed, 11 Mar 2009 04:55:19 +0100, Patch from Jean Delvare wrote:
> > The patch number 10935 was added via Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> > to http://linuxtv.org/hg/v4l-dvb master development tree.
> > 
> > Kernel patches in this development tree may be modified to be backward
> > compatible with older kernels. Compatibility modifications will be
> > removed before inclusion into the mainstream Kernel
> > 
> > If anyone has any objections, please let us know by sending a message to:
> > 	Linux Media Mailing List <linux-media@xxxxxxxxxxxxxxx>
> 
> Ugh, you committed the wrong patches :( I have sent updated patches with
> much cleaner code since then:
> http://www.spinics.net/lists/linux-media/msg02646.html
> http://www.spinics.net/lists/linux-media/msg02647.html
> http://www.spinics.net/lists/linux-media/msg02648.html
> http://www.spinics.net/lists/linux-media/msg02649.html

Yes, I noticed, while reviewing the other patches at patchwork. I've already
reverted it and applied the correct ones.
> 
> > ------
> > 
> > From: Jean Delvare  <khali@xxxxxxxxxxxx>
> > cx88: Prevent general protection fault on rmmod
> > 
> > 
> > When unloading the cx8800 driver I sometimes get a general protection
> > fault. Analysis revealed a race in cx88_ir_stop(). It can be solved by
> > using a delayed work instead of a timer for infrared input polling.
> > 
> > This fixes kernel.org bug #12802.
> > 
> > Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
> > Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> > 
> > 
> > ---
> > 
> >  linux/drivers/media/video/cx88/cx88-input.c |   27 +++++++++++++++-----
> >  1 file changed, 21 insertions(+), 6 deletions(-)
> > 
> > diff -r 60b0989f6c7a -r 46412997b3c0 linux/drivers/media/video/cx88/cx88-input.c
> > --- a/linux/drivers/media/video/cx88/cx88-input.c	Tue Mar 10 19:28:33 2009 -0700
> > +++ b/linux/drivers/media/video/cx88/cx88-input.c	Thu Mar 05 09:38:24 2009 +0000
> > @@ -49,8 +49,12 @@ struct cx88_IR {
> >  
> >  	/* poll external decoder */
> >  	int polling;
> > +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
> >  	struct work_struct work;
> >  	struct timer_list timer;
> > +#else
> > +	struct delayed_work work;
> > +#endif
> >  	u32 gpio_addr;
> >  	u32 last_gpio;
> >  	u32 mask_keycode;
> > (...)
> 


-- 

Cheers,
Mauro
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