ALSA: pcm: use goto statement instead of while statement to reduce indentation
In a process to calculate parameters of PCM substream, application of all
rules is iterated several times till parameter dependencies are satisfied.
In current implementation, two loops are used for the design, however this
brings two-level indentation and decline readability.
This commit attempts to reduce the indentation by using goto statement,
instead of outer while loop.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 000e6e9a..41aeb6f 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -337,54 +337,56 @@
rstamps[k] = 0;
for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
- do {
- again = 0;
- for (k = 0; k < constrs->rules_num; k++) {
- struct snd_pcm_hw_rule *r = &constrs->rules[k];
- unsigned int d;
- int doit = 0;
- if (r->cond && !(r->cond & params->flags))
- continue;
- for (d = 0; r->deps[d] >= 0; d++) {
- if (vstamps[r->deps[d]] > rstamps[k]) {
- doit = 1;
- break;
- }
+retry:
+ again = 0;
+ for (k = 0; k < constrs->rules_num; k++) {
+ struct snd_pcm_hw_rule *r = &constrs->rules[k];
+ unsigned int d;
+ int doit = 0;
+ if (r->cond && !(r->cond & params->flags))
+ continue;
+ for (d = 0; r->deps[d] >= 0; d++) {
+ if (vstamps[r->deps[d]] > rstamps[k]) {
+ doit = 1;
+ break;
}
- if (!doit)
- continue;
-
- if (trace_hw_mask_param_enabled()) {
- if (hw_is_mask(r->var))
- old_mask = *hw_param_mask(params, r->var);
- }
- if (trace_hw_interval_param_enabled()) {
- if (hw_is_interval(r->var))
- old_interval = *hw_param_interval(params, r->var);
- }
-
- changed = r->func(params, r);
-
- if (hw_is_mask(r->var)) {
- trace_hw_mask_param(substream, r->var, k + 1,
- &old_mask, hw_param_mask(params, r->var));
- }
- if (hw_is_interval(r->var)) {
- trace_hw_interval_param(substream, r->var, k + 1,
- &old_interval, hw_param_interval(params, r->var));
- }
-
- rstamps[k] = stamp;
- if (changed && r->var >= 0) {
- params->cmask |= (1 << r->var);
- vstamps[r->var] = stamp;
- again = 1;
- }
- if (changed < 0)
- return changed;
- stamp++;
}
- } while (again);
+ if (!doit)
+ continue;
+
+ if (trace_hw_mask_param_enabled()) {
+ if (hw_is_mask(r->var))
+ old_mask = *hw_param_mask(params, r->var);
+ }
+ if (trace_hw_interval_param_enabled()) {
+ if (hw_is_interval(r->var))
+ old_interval = *hw_param_interval(params, r->var);
+ }
+
+ changed = r->func(params, r);
+
+ if (hw_is_mask(r->var)) {
+ trace_hw_mask_param(substream, r->var, k + 1,
+ &old_mask, hw_param_mask(params, r->var));
+ }
+ if (hw_is_interval(r->var)) {
+ trace_hw_interval_param(substream, r->var, k + 1,
+ &old_interval, hw_param_interval(params, r->var));
+ }
+
+ rstamps[k] = stamp;
+ if (changed && r->var >= 0) {
+ params->cmask |= (1 << r->var);
+ vstamps[r->var] = stamp;
+ again = 1;
+ }
+ if (changed < 0)
+ return changed;
+ stamp++;
+ }
+
+ if (again)
+ goto retry;
return 0;
}