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ALSA: core: memalloc: add page alignment for iram

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Since mmap for userspace is based on page alignment, add page alignment
for iram alloc from pool, otherwise, some good data located in the same
page of dmab->area maybe touched wrongly by userspace like pulseaudio.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1608221747-3474-1-git-send-email-yibin.gong@nxp.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Robin Gong 2020-12-18 00:15:47 +08:00 • committed by Takashi Iwai
parent 150927c367
commit 74c64efa15
1 changed files with 2 additions and 1 deletions
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3
sound/core/memalloc.c
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@ -77,7 +77,8 @@ static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
/* Assign the pool into private_data field */
dmab->private_data = pool;
dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
dmab->area = gen_pool_dma_alloc_align(pool, size, &dmab->addr,
PAGE_SIZE);
}
/**