In Linux 4.0 or former, call of ioctl(2) with SNDRV_CTL_IOCTL_ELEM_ADD doesn't fill all of identical information in an argument; i.e. numid. With the kernel, a test of user-defined element set fails.
This commit fixes the bug. The 'numid' field in identical information is always zero when adding an element set, therefore zero check has an effect.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- test/user-ctl-element-set.c | 31 ++++++++++++++++++++----------- 1 file changed, 20 insertions(+), 11 deletions(-)
diff --git a/test/user-ctl-element-set.c b/test/user-ctl-element-set.c index 09c7929..bfb11d7 100644 --- a/test/user-ctl-element-set.c +++ b/test/user-ctl-element-set.c @@ -279,6 +279,7 @@ static int check_elem_set_props(struct elem_set_trial *trial) snd_ctl_elem_id_t *id; snd_ctl_elem_info_t *info; unsigned int numid; + unsigned int index; unsigned int i; int err;
@@ -286,10 +287,18 @@ static int check_elem_set_props(struct elem_set_trial *trial) snd_ctl_elem_info_alloca(&info);
snd_ctl_elem_info_set_id(info, trial->id); - numid = snd_ctl_elem_info_get_numid(info); + numid = snd_ctl_elem_id_get_numid(trial->id); + index = snd_ctl_elem_id_get_index(trial->id);
for (i = 0; i < trial->element_count; ++i) { - snd_ctl_elem_info_set_numid(info, numid + i); + snd_ctl_elem_info_set_index(info, index + i); + + /* + * In Linux 4.0 or former, ioctl(SNDRV_CTL_IOCTL_ELEM_ADD) + * doesn't fill all of fields for identification. + */ + if (numid > 0) + snd_ctl_elem_info_set_numid(info, numid + i);
err = snd_ctl_elem_info(trial->handle, info); if (err < 0) @@ -335,25 +344,25 @@ static int check_elems(struct elem_set_trial *trial) { snd_ctl_elem_value_t *data; unsigned int numid; + unsigned int index; unsigned int i; int err;
snd_ctl_elem_value_alloca(&data);
snd_ctl_elem_value_set_id(data, trial->id); - - /* - * Get the value of numid field in identical information for the first - * element of this element set. - */ - numid = snd_ctl_elem_value_get_numid(data); + numid = snd_ctl_elem_id_get_numid(trial->id); + index = snd_ctl_elem_id_get_index(trial->id);
for (i = 0; i < trial->element_count; ++i) { + snd_ctl_elem_value_set_index(data, index + i); + /* - * Here, I increment numid, while we can also increment offset - * to enumerate each element in this element set. + * In Linux 4.0 or former, ioctl(SNDRV_CTL_IOCTL_ELEM_ADD) + * doesn't fill all of fields for identification. */ - snd_ctl_elem_value_set_numid(data, numid + i); + if (numid > 0) + snd_ctl_elem_value_set_numid(data, numid + i);
err = snd_ctl_elem_read(trial->handle, data); if (err < 0)