Re: [patch] [media] mx3-camera: locking typo in mx3_videobuf_queue()

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Hi Dan,

On Fri, 23 Aug 2013, Dan Carpenter wrote:

> There is a return in the middle where we haven't restored the IRQs to
> their original state.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> 
> diff --git a/drivers/media/platform/soc_camera/mx3_camera.c b/drivers/media/platform/soc_camera/mx3_camera.c
> index 1047e3e..4bae910 100644
> --- a/drivers/media/platform/soc_camera/mx3_camera.c
> +++ b/drivers/media/platform/soc_camera/mx3_camera.c
> @@ -334,7 +334,7 @@ static void mx3_videobuf_queue(struct vb2_buffer *vb)
>  	if (!mx3_cam->active)
>  		mx3_cam->active = buf;
>  
> -	spin_unlock_irq(&mx3_cam->lock);
> +	spin_unlock_irqrestore(&mx3_cam->lock, flags);
>  
>  	cookie = txd->tx_submit(txd);
>  	dev_dbg(icd->parent, "Submitted cookie %d DMA 0x%08x\n",

Please, wait with this. The above doesn't seem quite right to me. IIRC, 
the purpose of unlock_irq(), i.e. of the unconditionally enabling IRQs was 
to make sure ->tx_submit() is called with interrupts enabled. I'm 
currently on holiday with very scarce internet access. Either please 
double-check this yourself or I'll have another look at it when back home 
next week.

Thanks
Guennadi

> @@ -343,7 +343,7 @@ static void mx3_videobuf_queue(struct vb2_buffer *vb)
>  	if (cookie >= 0)
>  		return;
>  
> -	spin_lock_irq(&mx3_cam->lock);
> +	spin_lock_irqsave(&mx3_cam->lock, flags);
>  
>  	/* Submit error */
>  	list_del_init(&buf->queue);
> 

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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