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ALSA: core: memalloc: add page alignment for iram

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commit 74c64efa15 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robin Gong 2020-12-18 00:15:47 +08:00 • committed by Greg Kroah-Hartman
commit bb9dc2f2e5
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);
}
/**