From: Arnd Bergmann arnd@arndb.de
clang warns about excessive stack usage in this driver when UBSAN is enabled:
drivers/staging/greybus/audio_topology.c:977:12: error: stack frame size of 1836 bytes in function 'gbaudio_tplg_create_widget' [-Werror,-Wframe-larger-than=]
Rework this code to no longer use compound literals for initializing the structure in each case, but instead keep the common bits in a preallocated constant array and copy them as needed.
Signed-off-by: Arnd Bergmann arnd@arndb.de --- drivers/staging/greybus/audio_topology.c | 106 ++++++++++------------- 1 file changed, 47 insertions(+), 59 deletions(-)
diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c index 96b8b29fe899..c03873915c20 100644 --- a/drivers/staging/greybus/audio_topology.c +++ b/drivers/staging/greybus/audio_topology.c @@ -974,6 +974,44 @@ static int gbaudio_widget_event(struct snd_soc_dapm_widget *w, return ret; }
+static const struct snd_soc_dapm_widget gbaudio_widgets[] = { + [snd_soc_dapm_spk] = SND_SOC_DAPM_SPK("spk", gbcodec_event_spk), + [snd_soc_dapm_hp] = SND_SOC_DAPM_HP("hp", gbcodec_event_hp), + [snd_soc_dapm_mic] = SND_SOC_DAPM_MIC("mic", gbcodec_event_int_mic), + [snd_soc_dapm_output] = SND_SOC_DAPM_OUTPUT("output"), + [snd_soc_dapm_input] = SND_SOC_DAPM_INPUT("input"), + [snd_soc_dapm_switch] = SND_SOC_DAPM_SWITCH_E("switch", SND_SOC_NOPM, + 0, 0, NULL, + gbaudio_widget_event, + SND_SOC_DAPM_PRE_PMU | + SND_SOC_DAPM_POST_PMD), + [snd_soc_dapm_pga] = SND_SOC_DAPM_PGA_E("pga", SND_SOC_NOPM, + 0, 0, NULL, 0, + gbaudio_widget_event, + SND_SOC_DAPM_PRE_PMU | + SND_SOC_DAPM_POST_PMD), + [snd_soc_dapm_mixer] = SND_SOC_DAPM_MIXER_E("mixer", SND_SOC_NOPM, + 0, 0, NULL, 0, + gbaudio_widget_event, + SND_SOC_DAPM_PRE_PMU | + SND_SOC_DAPM_POST_PMD), + [snd_soc_dapm_mux] = SND_SOC_DAPM_MUX_E("mux", SND_SOC_NOPM, + 0, 0, NULL, + gbaudio_widget_event, + SND_SOC_DAPM_PRE_PMU | + SND_SOC_DAPM_POST_PMD), + [snd_soc_dapm_aif_in] = SND_SOC_DAPM_AIF_IN_E("aif_in", NULL, 0, + SND_SOC_NOPM, 0, 0, + gbaudio_widget_event, + SND_SOC_DAPM_PRE_PMU | + SND_SOC_DAPM_POST_PMD), + [snd_soc_dapm_aif_out] = SND_SOC_DAPM_AIF_OUT_E("aif_out", NULL, 0, + SND_SOC_NOPM, 0, 0, + gbaudio_widget_event, + SND_SOC_DAPM_PRE_PMU | + SND_SOC_DAPM_POST_PMD), +}; + static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module, struct snd_soc_dapm_widget *dw, struct gb_audio_widget *w, int *w_size) @@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module, strlcpy(temp_name, w->name, NAME_SIZE); snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
+ if (w->type > ARRAY_SIZE(gbaudio_widgets)) { + ret = -EINVAL; + goto error; + } + *dw = gbaudio_widgets[w->type]; + dw->name = w->name; + switch (w->type) { case snd_soc_dapm_spk: - *dw = (struct snd_soc_dapm_widget) - SND_SOC_DAPM_SPK(w->name, gbcodec_event_spk); module->op_devices |= GBAUDIO_DEVICE_OUT_SPEAKER; break; case snd_soc_dapm_hp: - *dw = (struct snd_soc_dapm_widget) - SND_SOC_DAPM_HP(w->name, gbcodec_event_hp); module->op_devices |= (GBAUDIO_DEVICE_OUT_WIRED_HEADSET - | GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE); + | GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE), module->ip_devices |= GBAUDIO_DEVICE_IN_WIRED_HEADSET; break; case snd_soc_dapm_mic: - *dw = (struct snd_soc_dapm_widget) - SND_SOC_DAPM_MIC(w->name, gbcodec_event_int_mic); module->ip_devices |= GBAUDIO_DEVICE_IN_BUILTIN_MIC; break; - case snd_soc_dapm_output: - *dw = (struct snd_soc_dapm_widget)SND_SOC_DAPM_OUTPUT(w->name); - break; - case snd_soc_dapm_input: - *dw = (struct snd_soc_dapm_widget)SND_SOC_DAPM_INPUT(w->name); - break; - case snd_soc_dapm_switch: - *dw = (struct snd_soc_dapm_widget) - SND_SOC_DAPM_SWITCH_E(w->name, SND_SOC_NOPM, 0, 0, - widget_kctls, - gbaudio_widget_event, - SND_SOC_DAPM_PRE_PMU | - SND_SOC_DAPM_POST_PMD); - break; - case snd_soc_dapm_pga: - *dw = (struct snd_soc_dapm_widget) - SND_SOC_DAPM_PGA_E(w->name, SND_SOC_NOPM, 0, 0, NULL, 0, - gbaudio_widget_event, - SND_SOC_DAPM_PRE_PMU | - SND_SOC_DAPM_POST_PMD); - break; - case snd_soc_dapm_mixer: - *dw = (struct snd_soc_dapm_widget) - SND_SOC_DAPM_MIXER_E(w->name, SND_SOC_NOPM, 0, 0, NULL, - 0, gbaudio_widget_event, - SND_SOC_DAPM_PRE_PMU | - SND_SOC_DAPM_POST_PMD); - break; - case snd_soc_dapm_mux: - *dw = (struct snd_soc_dapm_widget) - SND_SOC_DAPM_MUX_E(w->name, SND_SOC_NOPM, 0, 0, - widget_kctls, gbaudio_widget_event, - SND_SOC_DAPM_PRE_PMU | - SND_SOC_DAPM_POST_PMD); - break; case snd_soc_dapm_aif_in: - *dw = (struct snd_soc_dapm_widget) - SND_SOC_DAPM_AIF_IN_E(w->name, w->sname, 0, - SND_SOC_NOPM, - 0, 0, gbaudio_widget_event, - SND_SOC_DAPM_PRE_PMU | - SND_SOC_DAPM_POST_PMD); - break; case snd_soc_dapm_aif_out: - *dw = (struct snd_soc_dapm_widget) - SND_SOC_DAPM_AIF_OUT_E(w->name, w->sname, 0, - SND_SOC_NOPM, - 0, 0, gbaudio_widget_event, - SND_SOC_DAPM_PRE_PMU | - SND_SOC_DAPM_POST_PMD); - break; - default: - ret = -EINVAL; - goto error; + dw->sname = w->sname; }
dev_dbg(module->dev, "%s: widget of type %d created\n", dw->name,
On 1/3/21 4:35 PM, Arnd Bergmann wrote:
From: Arnd Bergmann arnd@arndb.de
clang warns about excessive stack usage in this driver when UBSAN is enabled:
drivers/staging/greybus/audio_topology.c:977:12: error: stack frame size of 1836 bytes in function 'gbaudio_tplg_create_widget' [-Werror,-Wframe-larger-than=]
Rework this code to no longer use compound literals for initializing the structure in each case, but instead keep the common bits in a preallocated constant array and copy them as needed.
This is good, but I have a few comments.
You took out the default case, and it seems you are using a w->type value bigger than the initialization array to determine validity. But there are more values defined in the snd_soc_dapm_type enumerated type than are explicitly listed as cases in the switch statement. So the switch statement no longer treats some types as invalid (such as snd_soc_dapm_demux). Am I missing something?
You are setting explicit names, such as "spk", "hp", "mic", etc. in the initialization array. But you update the name after (struct) assigning from the array. I have no real objection I guess, but why bother? Why not just use null pointers in the initialization array?
You change a semicolon to a comma in one spot, and you should not have. I'll point that out below.
I like that you got rid of the type casts, which were apparently unnecessary.
You dropped the break in the final case in the switch statement, but in an earlier discussion I think we concluded that wasn't a problem.
I guess the main thing is the first thing mentioned.
Thanks.
-Alex
Signed-off-by: Arnd Bergmann arnd@arndb.de
drivers/staging/greybus/audio_topology.c | 106 ++++++++++------------- 1 file changed, 47 insertions(+), 59 deletions(-)
diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c index 96b8b29fe899..c03873915c20 100644 --- a/drivers/staging/greybus/audio_topology.c +++ b/drivers/staging/greybus/audio_topology.c @@ -974,6 +974,44 @@ static int gbaudio_widget_event(struct snd_soc_dapm_widget *w, return ret; } +static const struct snd_soc_dapm_widget gbaudio_widgets[] = {
- [snd_soc_dapm_spk] = SND_SOC_DAPM_SPK("spk", gbcodec_event_spk),
- [snd_soc_dapm_hp] = SND_SOC_DAPM_HP("hp", gbcodec_event_hp),
- [snd_soc_dapm_mic] = SND_SOC_DAPM_MIC("mic", gbcodec_event_int_mic),
. . .
@@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module, strlcpy(temp_name, w->name, NAME_SIZE); snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
- if (w->type > ARRAY_SIZE(gbaudio_widgets)) {
ret = -EINVAL;goto error;- }
- *dw = gbaudio_widgets[w->type];
- dw->name = w->name;
- switch (w->type) { case snd_soc_dapm_spk:
*dw = (struct snd_soc_dapm_widget)SND_SOC_DAPM_SPK(w->name, gbcodec_event_spk);*dw = (struct snd_soc_dapm_widget)SND_SOC_DAPM_HP(w->name, gbcodec_event_hp);| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE);
| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE),
Please fix this (above) to preserve the original semicolon.
module->ip_devices |= GBAUDIO_DEVICE_IN_WIRED_HEADSET; break;case snd_soc_dapm_mic:
*dw = (struct snd_soc_dapm_widget)SND_SOC_DAPM_MIC(w->name, gbcodec_event_int_mic);
. . .
On Sun, Jan 03, 2021 at 11:35:32PM +0100, Arnd Bergmann wrote:
@@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module, strlcpy(temp_name, w->name, NAME_SIZE); snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
- if (w->type > ARRAY_SIZE(gbaudio_widgets)) {
^^
Off by one. >= here.
ret = -EINVAL;goto error;- }
- *dw = gbaudio_widgets[w->type];
- dw->name = w->name;
regards, dan carpenter
-
Alex Elder -
Arnd Bergmann -
Dan Carpenter