[PATCH v3] soundwire: debugfs: move debug statement outside of error handling

[PATCH v3] soundwire: debugfs: move debug statement outside of error handling

[Rodrigo Gobbi]

The start_t and finish_t variables are not properly initialized
if errors happens over request_firmware actions.
This was also detected by smatch:

drivers/soundwire/debugfs.c:301 cmd_go() error: uninitialized symbol 'finish_t'.
drivers/soundwire/debugfs.c:301 cmd_go() error: uninitialized symbol 'start_t'.

Move the debug statement outside of firmware error handling.

Signed-off-by: Rodrigo Gobbi <rodrigo.gobbi.7@gmail.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-sound/0db6d0bf-7bac-43a7-b624-a00d3d2bf829@stanley.mountain/
Fixes: bb5cb09eedce ("soundwire: debugfs: add interface for BPT/BRA transfers")
---
Changelog:
v3: removed superfluous initialization of ktime_t vars
v2: https://lore.kernel.org/linux-sound/aF2Em76RGWVpJfg-@vaman/T/#mb875b96a6dc1bd18a939caf1d3288b3b3b5e78c3
v1: https://lore.kernel.org/linux-sound/20250617015230.54981-1-rodrigo.gobbi.7@gmail.com/#t
---
 drivers/soundwire/debugfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/soundwire/debugfs.c b/drivers/soundwire/debugfs.c
index 3099ea074f10..230a51489486 100644
--- a/drivers/soundwire/debugfs.c
+++ b/drivers/soundwire/debugfs.c
@@ -291,6 +291,9 @@ static int cmd_go(void *data, u64 value)
 
 	finish_t = ktime_get();
 
+	dev_dbg(&slave->dev, "command completed, num_byte %zu status %d, time %lld ms\n",
+		num_bytes, ret, div_u64(finish_t - start_t, NSEC_PER_MSEC));
+
 out:
 	if (fw)
 		release_firmware(fw);
@@ -298,9 +301,6 @@ static int cmd_go(void *data, u64 value)
 	pm_runtime_mark_last_busy(&slave->dev);
 	pm_runtime_put(&slave->dev);
 
-	dev_dbg(&slave->dev, "command completed, num_byte %zu status %d, time %lld ms\n",
-		num_bytes, ret, div_u64(finish_t - start_t, NSEC_PER_MSEC));
-
 	return ret;
 }
 DEFINE_DEBUGFS_ATTRIBUTE(cmd_go_fops, NULL,
-- 
2.49.0

Re: [PATCH v3] soundwire: debugfs: move debug statement outside of error handling

[Vinod Koul]

On Thu, 26 Jun 2025 18:33:14 -0300, Rodrigo Gobbi wrote:
> The start_t and finish_t variables are not properly initialized
> if errors happens over request_firmware actions.
> This was also detected by smatch:
> 
> drivers/soundwire/debugfs.c:301 cmd_go() error: uninitialized symbol 'finish_t'.
> drivers/soundwire/debugfs.c:301 cmd_go() error: uninitialized symbol 'start_t'.
> 
> [...]

Applied, thanks!

[1/1] soundwire: debugfs: move debug statement outside of error handling
      commit: 06f77ff9d852c9f2764659ea81489364d8a69a9c

Best regards,
-- 
~Vinod