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@xxxxxxxxxxxxx>
---
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)
--
2.7.4
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