[alsa-devel] [PATCH] ALSA: pcm: Use dma_bytes as size parameter in dma_mmap_coherent()

[Takashi Iwai]

On Mon, 26 Mar 2018 16:10:21 +0200,
Stefan Roese wrote:
> 
> When trying to use the driver (e.g. aplay *.wav), the 4MiB DMA buffer
> will get mmapp'ed in 16KiB chunks. But this fails with the 2nd 16KiB
> area, as the page offset is outside of the VMA range (size), which is
> currently used as size parameter in snd_pcm_lib_default_mmap(). By
> using the DMA buffer size (dma_bytes) instead, the complete DMA buffer
> can be mmapp'ed and the issue is fixed.
> 
> This issue was detected on an ARM platform (TI AM57xx) using the RME
> HDSP MADI PCIe soundcard.
> 
> Signed-off-by: Stefan Roese <sr at denx.de>
> Cc: Jaroslav Kysela <perex at perex.cz>
> Cc: Takashi Iwai <tiwai at suse.com>
> Cc: Takashi Sakamoto <o-takashi at sakamocchi.jp>

Applied now.

Thanks for catching this.  It was an itchy bug that has been standing
for long time.


Takashi