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Allow DSP basename cloning to be disabled or enabled at boot and

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runtime. This is useful when implementing OSS sound stacks in
userspace via libcuse for example.

MFC after:	2 weeks
This commit is contained in:
Hans Petter Selasky 2015-04-26 11:39:13 +00:00
parent 0af928e203
commit d3f37016f7
1 changed files with 9 additions and 3 deletions
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12
sys/dev/sound/pcm/dsp.c
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@ -48,6 +48,11 @@ SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RWTUN,
&dsp_mmap_allow_prot_exec, 0,
"linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
static int dsp_basename_clone = 1;
SYSCTL_INT(_hw_snd, OID_AUTO, basename_clone, CTLFLAG_RWTUN,
&dsp_basename_clone, 0,
"DSP basename cloning (0: Disable; 1: Enabled)");
struct dsp_cdevinfo {
struct pcm_channel *rdch, *wrch;
struct pcm_channel *volch;
@ -2357,9 +2362,10 @@ dsp_clone(void *arg,
devname = devcmp;
devhw = dsp_cdevs[i].hw;
devcmax = dsp_cdevs[i].max - 1;
if (strcmp(name, devcmp) == 0)
unit = snd_unit;
else if (dsp_stdclone(name, devcmp, devsep,
if (strcmp(name, devcmp) == 0) {
if (dsp_basename_clone != 0)
unit = snd_unit;
} else if (dsp_stdclone(name, devcmp, devsep,
dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
unit = -1;
cunit = -1;