[PATCH] ASoC: wm_adsp: Fix missing locking in wm_adsp_[read|write]_ctl()

[PATCH] ASoC: wm_adsp: Fix missing locking in wm_adsp_[read|write]_ctl()

[Richard Fitzgerald]

wm_adsp_read_ctl() and wm_adsp_write_ctl() must hold the cs_dsp pwr_lock
mutex when calling cs_dsp_coeff_read_ctrl() and cs_dsp_coeff_write_ctrl().

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
---
These functions aren't currently used so this fix doesn't need
to be backported.
---
 sound/soc/codecs/wm_adsp.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 6fc34f41b175..d1b9238d391e 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -687,7 +687,10 @@ int wm_adsp_write_ctl(struct wm_adsp *dsp, const char *name, int type,
 	struct wm_coeff_ctl *ctl;
 	int ret;
 
+	mutex_lock(&dsp->cs_dsp.pwr_lock);
 	ret = cs_dsp_coeff_write_ctrl(cs_ctl, 0, buf, len);
+	mutex_unlock(&dsp->cs_dsp.pwr_lock);
+
 	if (ret < 0)
 		return ret;
 
@@ -703,8 +706,14 @@ EXPORT_SYMBOL_GPL(wm_adsp_write_ctl);
 int wm_adsp_read_ctl(struct wm_adsp *dsp, const char *name, int type,
 		     unsigned int alg, void *buf, size_t len)
 {
-	return cs_dsp_coeff_read_ctrl(cs_dsp_get_ctl(&dsp->cs_dsp, name, type, alg),
-				      0, buf, len);
+	int ret;
+
+	mutex_lock(&dsp->cs_dsp.pwr_lock);
+	ret = cs_dsp_coeff_read_ctrl(cs_dsp_get_ctl(&dsp->cs_dsp, name, type, alg),
+				     0, buf, len);
+	mutex_unlock(&dsp->cs_dsp.pwr_lock);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(wm_adsp_read_ctl);
 
-- 
2.30.2

Re: [PATCH] ASoC: wm_adsp: Fix missing locking in wm_adsp_[read|write]_ctl()

[Mark Brown]

On Wed, 13 Sep 2023 17:02:50 +0100, Richard Fitzgerald wrote:
> wm_adsp_read_ctl() and wm_adsp_write_ctl() must hold the cs_dsp pwr_lock
> mutex when calling cs_dsp_coeff_read_ctrl() and cs_dsp_coeff_write_ctrl().
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: wm_adsp: Fix missing locking in wm_adsp_[read|write]_ctl()
      commit: 781118bc2fc1026c8285f83ea7ecab07071a09c4

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark