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    Subject[PATCH 5.4 15/64] ALSA: intel_hdmi: Fix reference to PCM buffer address
    Date
    From: Zhen Ni <nizhen@uniontech.com>

    commit 0aa6b294b312d9710804679abd2c0c8ca52cc2bc upstream.

    PCM buffers might be allocated dynamically when the buffer
    preallocation failed or a larger buffer is requested, and it's not
    guaranteed that substream->dma_buffer points to the actually used
    buffer. The driver needs to refer to substream->runtime->dma_addr
    instead for the buffer address.

    Signed-off-by: Zhen Ni <nizhen@uniontech.com>
    Cc: <stable@vger.kernel.org>
    Link: https://lore.kernel.org/r/20220302074241.30469-1-nizhen@uniontech.com
    Signed-off-by: Takashi Iwai <tiwai@suse.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    sound/x86/intel_hdmi_audio.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/sound/x86/intel_hdmi_audio.c
    +++ b/sound/x86/intel_hdmi_audio.c
    @@ -1279,7 +1279,7 @@ static int had_pcm_mmap(struct snd_pcm_s
    {
    vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
    return remap_pfn_range(vma, vma->vm_start,
    - substream->dma_buffer.addr >> PAGE_SHIFT,
    + substream->runtime->dma_addr >> PAGE_SHIFT,
    vma->vm_end - vma->vm_start, vma->vm_page_prot);
    }


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