linux-kernel - Re: [PATCH] ALSA: memalloc: prefer dma_mapping

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Message-ID: <878qsaraxt.wl-tiwai@suse.de>
Date: Fri, 20 Dec 2024 09:54:54 +0100
From: Takashi Iwai <tiwai@...e.de>
To: Fedor Pchelkin <pchelkin@...ras.ru>
Cc: Takashi Iwai <tiwai@...e.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
Subject: Re: [PATCH] ALSA: memalloc: prefer dma_mapping_error() over explicit address checking

On Thu, 19 Dec 2024 21:33:45 +0100,
Fedor Pchelkin wrote:
> 
> With CONFIG_DMA_API_DEBUG enabled, the following warning is observed:
> 
> DMA-API: snd_hda_intel 0000:03:00.1: device driver failed to check map error[device address=0x00000000ffff0000] [size=20480 bytes] [mapped as single]
> WARNING: CPU: 28 PID: 2255 at kernel/dma/debug.c:1036 check_unmap+0x1408/0x2430
> CPU: 28 UID: 42 PID: 2255 Comm: wireplumber Tainted: G  W L  6.12.0-10-133577cad6bf48e5a7848c4338124081393bfe8a+ #759
> debug_dma_unmap_page+0xe9/0xf0
> snd_dma_wc_free+0x85/0x130 [snd_pcm]
> snd_pcm_lib_free_pages+0x1e3/0x440 [snd_pcm]
> snd_pcm_common_ioctl+0x1c9a/0x2960 [snd_pcm]
> snd_pcm_ioctl+0x6a/0xc0 [snd_pcm]
> ...
> 
> Check for returned DMA addresses using specialized dma_mapping_error()
> helper which is generally recommended for this purpose by
> Documentation/core-api/dma-api.rst.
> 
> Fixes: c880a5146642 ("ALSA: memalloc: Use proper DMA mapping API for x86 WC buffer allocations")
> Reported-by: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
> Closes: https://lore.kernel.org/r/CABXGCsNB3RsMGvCucOy3byTEOxoc-Ys+zB_HQ=Opb_GhX1ioDA@mail.gmail.com/
> Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
> Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
> ---
> Decided not to wrap long dmesg lines. If it looks really ugly for the
> commit message, please feel free to adjust them to the standards.

It looks fine, so applied now.  Thanks!


Takashi