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pcm: fix 64-bit SNDRV_PCM_IOCTL_STATUS ABI breakage

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Commit cf40ea169a (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 <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2012-10-28 12:30:29 +01:00
parent cf40ea169a
commit 2b49df0c55
1 changed files with 2 additions and 1 deletions
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3
include/sound/asound.h
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@ -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 {