linux-kernel - Re: Patch "ALSA: pci: rme: Set up buffer type properly" has been added to the 5.14-stable tree

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Date:   Sun, 7 Nov 2021 15:59:32 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     tiwai@...e.de, stable-commits@...r.kernel.org
Subject: Re: Patch "ALSA: pci: rme: Set up buffer type properly" has been
 added to the 5.14-stable tree

On Sun, Nov 07, 2021 at 03:49:17PM +0100, gregkh@...uxfoundation.org wrote:
> 
> This is a note to let you know that I've just added the patch titled
> 
>     ALSA: pci: rme: Set up buffer type properly
> 
> to the 5.14-stable tree which can be found at:
>     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> 
> The filename of the patch is:
>      alsa-pci-rme-set-up-buffer-type-properly.patch
> and it can be found in the queue-5.14 subdirectory.
> 
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@...r.kernel.org> know about it.
> 
> 
> >From 0899a7a23047f106c06888769d6cd6ff43d7395f Mon Sep 17 00:00:00 2001
> From: Takashi Iwai <tiwai@...e.de>
> Date: Mon, 9 Aug 2021 09:18:28 +0200
> Subject: ALSA: pci: rme: Set up buffer type properly
> 
> From: Takashi Iwai <tiwai@...e.de>
> 
> commit 0899a7a23047f106c06888769d6cd6ff43d7395f upstream.
> 
> Although the regression of the mmap was fixed in the recent commit
> dc0dc8a73e8e ("ALSA: pcm: Fix mmap breakage without explicit buffer
> setup"), RME9652 and HDSP drivers have still potential issues with
> their mmap handling.  Namely, they use the default mmap handler
> without the standard buffer preallocation, and PCM core wouldn't use
> the coherent DMA mapping.  It's practically OK on x86, but on some
> exotic architectures, it wouldn't work.
> 
> This patch addresses the potential breakage by replacing the buffer
> setup with the proper macro.  It also simplifies the source code,
> too.
> 
> Link: https://lore.kernel.org/r/20210809071829.22238-3-tiwai@suse.de
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  sound/pci/rme9652/hdsp.c    |    6 ++----
>  sound/pci/rme9652/rme9652.c |    6 ++----
>  2 files changed, 4 insertions(+), 8 deletions(-)
> 
> --- a/sound/pci/rme9652/hdsp.c
> +++ b/sound/pci/rme9652/hdsp.c
> @@ -4518,8 +4518,7 @@ static int snd_hdsp_playback_open(struct
>  	snd_pcm_set_sync(substream);
>  
>          runtime->hw = snd_hdsp_playback_subinfo;
> -	runtime->dma_area = hdsp->playback_buffer;
> -	runtime->dma_bytes = HDSP_DMA_AREA_BYTES;
> +	snd_pcm_set_runtime_buffer(substream, hdsp->playback_dma_buf);
>  
>  	hdsp->playback_pid = current->pid;
>  	hdsp->playback_substream = substream;
> @@ -4595,8 +4594,7 @@ static int snd_hdsp_capture_open(struct
>  	snd_pcm_set_sync(substream);
>  
>  	runtime->hw = snd_hdsp_capture_subinfo;
> -	runtime->dma_area = hdsp->capture_buffer;
> -	runtime->dma_bytes = HDSP_DMA_AREA_BYTES;
> +	snd_pcm_set_runtime_buffer(substream, hdsp->capture_dma_buf);
>  
>  	hdsp->capture_pid = current->pid;
>  	hdsp->capture_substream = substream;
> --- a/sound/pci/rme9652/rme9652.c
> +++ b/sound/pci/rme9652/rme9652.c
> @@ -2279,8 +2279,7 @@ static int snd_rme9652_playback_open(str
>  	snd_pcm_set_sync(substream);
>  
>          runtime->hw = snd_rme9652_playback_subinfo;
> -	runtime->dma_area = rme9652->playback_buffer;
> -	runtime->dma_bytes = RME9652_DMA_AREA_BYTES;
> +	snd_pcm_set_runtime_buffer(substream, rme9652->playback_dma_buf);
>  
>  	if (rme9652->capture_substream == NULL) {
>  		rme9652_stop(rme9652);
> @@ -2339,8 +2338,7 @@ static int snd_rme9652_capture_open(stru
>  	snd_pcm_set_sync(substream);
>  
>  	runtime->hw = snd_rme9652_capture_subinfo;
> -	runtime->dma_area = rme9652->capture_buffer;
> -	runtime->dma_bytes = RME9652_DMA_AREA_BYTES;
> +	snd_pcm_set_runtime_buffer(substream, rme9652->capture_dma_buf);
>  
>  	if (rme9652->playback_substream == NULL) {
>  		rme9652_stop(rme9652);
> 
> 
> Patches currently in stable-queue which might be from tiwai@...e.de are
> 
> queue-5.14/alsa-pci-rme-set-up-buffer-type-properly.patch
> queue-5.14/alsa-pcm-check-mmap-capability-of-runtime-dma-buffer-at-first.patch
> queue-5.14/alsa-pci-cs46xx-fix-set-up-buffer-type-properly.patch

This patch breaks the build, so I will drop it.

Can you provide a working backport?

thanks,

greg k-h