On 06/06/2010 02:43 PM, Richard Zidlicky wrote:
> Hi,
>
> I have done a minimaly invasive patch for the stable 2.6.34 kernel and
> stress-tested
> it for many hours, definitely seems to improve the behaviour.
>
> I have left out your beautification suggestion for now, want to do more
> playing with
> other aspects of the driver. There still seem to be issues when the device is
> unplugged
> while in use and such.
>
> --- linux-2.6.34/drivers/media/dvb/siano/smscoreapi.c.rz 2010-06-03
> 21:58:11.000000000 +0200
> +++ linux-2.6.34/drivers/media/dvb/siano/smscoreapi.c 2010-06-04
> 23:00:35.000000000 +0200
> @@ -1100,31 +1100,26 @@
> *
> * @return pointer to descriptor on success, NULL on error.
> */
> -struct smscore_buffer_t *smscore_getbuffer(struct smscore_device_t *coredev)
> +
> +struct smscore_buffer_t *get_entry(void)
> {
> struct smscore_buffer_t *cb = NULL;
> unsigned long flags;
>
> - DEFINE_WAIT(wait);
> -
> spin_lock_irqsave(&coredev->bufferslock, flags);
Sorry, maybe I'm just blind, but where is 'coredev' defined in this
scope? You probably forgot to pass it to get_entry?
How could this be compiled? Is there coredev defined globally?
> -
> - /* This function must return a valid buffer, since the buffer list is
> - * finite, we check that there is an available buffer, if not, we wait
> - * until such buffer become available.
> - */
> -
> - prepare_to_wait(&coredev->buffer_mng_waitq, &wait, TASK_INTERRUPTIBLE);
> -
> - if (list_empty(&coredev->buffers))
> - schedule();
> -
> - finish_wait(&coredev->buffer_mng_waitq, &wait);
> -
> + if (!list_empty(&coredev->buffers)) {
> cb = (struct smscore_buffer_t *) coredev->buffers.next;
> list_del(&cb->entry);
> -
> + }
> spin_unlock_irqrestore(&coredev->bufferslock, flags);
> + return cb;
> +}
> +
> +struct smscore_buffer_t *smscore_getbuffer(struct smscore_device_t *coredev)
> +{
> + struct smscore_buffer_t *cb = NULL;
> +
> + wait_event(coredev->buffer_mng_waitq, (cb = get_entry()));
>
> return cb;
> }
--
js
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