Messages in this thread Patch in this message | | | Date | Mon, 03 Nov 2014 16:15:49 +0100 | From | Hans Verkuil <> | Subject | Re: [PATCH 4/4] [media] solo6x10: don't turn off/on encoder interrupt in processing loop |
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Hi Andrey,
On 10/29/2014 05:03 PM, Andrey Utkin wrote: > The used approach actually cannot prevent new encoder interrupt to > appear, because interrupt handler can execute in different thread, and > in current implementation there is still race condition regarding this.
I don't understand what you mean with 'interrupt handler can execute in different thread'. Can you elaborate?
Note that I do think that this change makes sense, but I do like to have a better explanation.
Regards,
Hans
> Also from practice the code with this change seems to work as stable as > before. > > Signed-off-by: Andrey Utkin <andrey.krieger.utkin@gmail.com> > --- > drivers/media/pci/solo6x10/solo6x10-v4l2-enc.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/drivers/media/pci/solo6x10/solo6x10-v4l2-enc.c b/drivers/media/pci/solo6x10/solo6x10-v4l2-enc.c > index b9b61b9..30e09d9 100644 > --- a/drivers/media/pci/solo6x10/solo6x10-v4l2-enc.c > +++ b/drivers/media/pci/solo6x10/solo6x10-v4l2-enc.c > @@ -703,9 +703,7 @@ static int solo_ring_thread(void *data) > > if (timeout == -ERESTARTSYS || kthread_should_stop()) > break; > - solo_irq_off(solo_dev, SOLO_IRQ_ENCODER); > solo_handle_ring(solo_dev); > - solo_irq_on(solo_dev, SOLO_IRQ_ENCODER); > try_to_freeze(); > } > >
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