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    Subject[PATCH 5.10 550/717] ALSA: core: memalloc: add page alignment for iram
    Date
    From: Robin Gong <yibin.gong@nxp.com>

    commit 74c64efa1557fef731b59eb813f115436d18078e 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>

    ---
    sound/core/memalloc.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/sound/core/memalloc.c
    +++ b/sound/core/memalloc.c
    @@ -77,7 +77,8 @@ static void snd_malloc_dev_iram(struct s
    /* 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);
    }

    /**

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