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The appl pointer needs to be updated only when snd_pcm_mmap_commit() is successfully returned. Or it shouldn't be updated. This is to fix the avail_update()'s result is incorrect when returns error. (From OE-Core rev: fcd7e439497174256a5c467532aad402f4d19ca1) (From OE-Core rev: 4ddef11c6a0f0a2d2ff0d4e556c0bbb3d5999f83) Signed-off-by: Yuqing Zhu <carol.zhu@nxp.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> Signed-off-by: Armin Kuster <akuster@mvista.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>