On Fri, 22 Mar 2019 15:06:28 +0100,
Arnd Bergmann wrote:
>
> When CONFIG_PCI is disabled, clang gets confused about the
> control flow of the switch() statement always ending up
> in the default case, and warns:
>
> sound/pci/hda/patch_ca0132.c:7558:6: error: variable 'fw_entry' is used uninitialized whenever 'if' condition is false
> [-Werror,-Wsometimes-uninitialized]
> if (!spec->alt_firmware_present) {
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> sound/pci/hda/patch_ca0132.c:7565:42: note: uninitialized use occurs here
> dsp_os_image = (struct dsp_image_seg *)(fw_entry->data);
> ^~~~~~~~
> sound/pci/hda/patch_ca0132.c:7558:2: note: remove the 'if' if its condition is always true
> if (!spec->alt_firmware_present) {
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> sound/pci/hda/patch_ca0132.c:7521:33: note: initialize the variable 'fw_entry' to silence this warning
> const struct firmware *fw_entry;
> ^
> = NULL
>
> Adding an explicit check for CONFIG_PCI avoids the issue.
> Unfortunately this is not very intuitive here.
>
> Link: https://bugs.llvm.org/show_bug.cgi?id=41197#c1
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> Any suggestions for other workarounds appreciated. If you can think
> of a better fix, please treat this as a reported-by:
Can it be addressed by the code simplification like below, instead?
thanks,
Takashi
---
sound/pci/hda/patch_ca0132.c | 20 ++++++--------------
1 file changed, 6 insertions(+), 14 deletions(-)
diff --git a/sound/pci/hda/patch_ca0132.c b/sound/pci/hda/patch_ca0132.c
index 29882bda7632..e1ebc6d5f382 100644
--- a/sound/pci/hda/patch_ca0132.c
+++ b/sound/pci/hda/patch_ca0132.c
@@ -1005,7 +1005,6 @@ struct ca0132_spec {
unsigned int scp_resp_header;
unsigned int scp_resp_data[4];
unsigned int scp_resp_count;
- bool alt_firmware_present;
bool startup_check_entered;
bool dsp_reload;
@@ -7518,7 +7517,7 @@ static bool ca0132_download_dsp_images(struct hda_codec *codec)
bool dsp_loaded = false;
struct ca0132_spec *spec = codec->spec;
const struct dsp_image_seg *dsp_os_image;
- const struct firmware *fw_entry;
+ const struct firmware *fw_entry = NULL;
/*
* Alternate firmwares for different variants. The Recon3Di apparently
* can use the default firmware, but I'll leave the option in case
@@ -7529,33 +7528,26 @@ static bool ca0132_download_dsp_images(struct hda_codec *codec)
case QUIRK_R3D:
case QUIRK_AE5:
if (request_firmware(&fw_entry, DESKTOP_EFX_FILE,
- codec->card->dev) != 0) {
+ codec->card->dev) != 0)
codec_dbg(codec, "Desktop firmware not found.");
- spec->alt_firmware_present = false;
- } else {
+ else
codec_dbg(codec, "Desktop firmware selected.");
- spec->alt_firmware_present = true;
- }
break;
case QUIRK_R3DI:
if (request_firmware(&fw_entry, R3DI_EFX_FILE,
- codec->card->dev) != 0) {
+ codec->card->dev) != 0)
codec_dbg(codec, "Recon3Di alt firmware not detected.");
- spec->alt_firmware_present = false;
- } else {
+ else
codec_dbg(codec, "Recon3Di firmware selected.");
- spec->alt_firmware_present = true;
- }
break;
default:
- spec->alt_firmware_present = false;
break;
}
/*
* Use default ctefx.bin if no alt firmware is detected, or if none
* exists for your particular codec.
*/
- if (!spec->alt_firmware_present) {
+ if (!fw_entry) {
codec_dbg(codec, "Default firmware selected.");
if (request_firmware(&fw_entry, EFX_FILE,
codec->card->dev) != 0)
--
2.16.4
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