From 2b49df0c554cb9c7fc717dcf82d1b8f5310eef62 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Sun, 28 Oct 2012 12:30:29 +0100 Subject: [PATCH] pcm: fix 64-bit SNDRV_PCM_IOCTL_STATUS ABI breakage Commit cf40ea169aad (pcm: support for audio timestamps) added the new audio_tstamp field to struct sndrv_pcm_status. However, struct timespec requires 64-bit alignment, so the 64-bit compiler would insert 32 bits of padding before this field, which broke SNDRV_PCM_IOCTL_STATUS with error messages like this: kernel: unknown ioctl = 0x80984120 To solve this, insert the padding explicitly so that it can be taken into account when calculating the ABI structure size. Signed-off-by: Clemens Ladisch --- include/sound/asound.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/sound/asound.h b/include/sound/asound.h index 16d03e82..8fdad913 100644 --- a/include/sound/asound.h +++ b/include/sound/asound.h @@ -427,8 +427,9 @@ struct sndrv_pcm_status { sndrv_pcm_uframes_t avail_max; /* max frames available on hw since last status */ sndrv_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */ int suspended_state; /* suspended stream state */ + u_int32_t reserved_alignment; /* must be filled with zero */ struct timespec audio_tstamp; /* from sample counter or wall clock */ - unsigned char reserved[60-sizeof(struct timespec)]; /* must be filled with zero */ + unsigned char reserved[56-sizeof(struct timespec)]; /* must be filled with zero */ }; struct sndrv_pcm_mmap_status { -- 2.11.0