lkml.org 
[lkml]   [2016]   [Jul]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] dmaengine: pxa_dma: implement device_synchronize
On Sun, Jul 10, 2016 at 11:50:49PM +0200, Robert Jarzmik wrote:
> Implement the function which wait until a dma channel is stopped to have
> a synchronization point.
>
> This also protects the pxad_remove() from races, such as spurious
> interrupts while removing the driver, because :
> - as long as there is one dma channel requested, ie. dma_chan_get() but
> no dma_chan_put(), the try_module_get() of dma_chan_get() prevents
> the remove() routine from running
> - when the last channel is released, ie. the last dma_chan_put() is
> called, if there is a running DMA, pxad_synchronize() is called
> - pxad_synchronize() waits for the channel to stop, which in turn
> ensures on pxa architecture that the interrupt cannot be fired anymore

Applied, thanks

--
~Vinod

\
 
 \ /
  Last update: 2016-07-12 07:01    [W:0.045 / U:1.196 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site