[PATCH v2 0/2] Fix unchecked return value for clk_prepare_enable

First patch is to remove the check of clock pointer before calling
clk API.

Second patch is to fix the issue that the return value of
clk_prepare_enable is not checked.

changes in v2:
- split the patch to separate patches

Shengjiu Wang (2):
  ASoC: fsl_mqs: Don't check clock is NULL before calling clk API
  ASoC: fsl_mqs: Fix unchecked return value for clk_prepare_enable

 sound/soc/fsl/fsl_mqs.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

-- 
2.21.0

Because clk_prepare_enable and clk_disable_unprepare should
check input clock parameter is NULL or not internally, then
we don't need to check them before calling the function.

Fixes: 9e28f6532c61 ("ASoC: fsl_mqs: Add MQS component driver")
Signed-off-by: Shengjiu Wang <redacted>
---
 sound/soc/fsl/fsl_mqs.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/sound/soc/fsl/fsl_mqs.c b/sound/soc/fsl/fsl_mqs.c
index 0c813a45bba7..b44b134390a3 100644
--- a/sound/soc/fsl/fsl_mqs.c
+++ b/sound/soc/fsl/fsl_mqs.c

@@ -266,11 +266,9 @@ static int fsl_mqs_runtime_resume(struct device *dev)
 {
 	struct fsl_mqs *mqs_priv = dev_get_drvdata(dev);
 
-	if (mqs_priv->ipg)
-		clk_prepare_enable(mqs_priv->ipg);
+	clk_prepare_enable(mqs_priv->ipg);
 
-	if (mqs_priv->mclk)
-		clk_prepare_enable(mqs_priv->mclk);
+	clk_prepare_enable(mqs_priv->mclk);
 
 	if (mqs_priv->use_gpr)
 		regmap_write(mqs_priv->regmap, IOMUXC_GPR2,

@@ -292,11 +290,8 @@ static int fsl_mqs_runtime_suspend(struct device *dev)
 		regmap_read(mqs_priv->regmap, REG_MQS_CTRL,
 			    &mqs_priv->reg_mqs_ctrl);
 
-	if (mqs_priv->mclk)
-		clk_disable_unprepare(mqs_priv->mclk);
-
-	if (mqs_priv->ipg)
-		clk_disable_unprepare(mqs_priv->ipg);
+	clk_disable_unprepare(mqs_priv->mclk);
+	clk_disable_unprepare(mqs_priv->ipg);
 
 	return 0;
 }

-- 
2.21.0

Fix unchecked return value for clk_prepare_enable, add error
handler in fsl_mqs_runtime_resume.

Fixes: 9e28f6532c61 ("ASoC: fsl_mqs: Add MQS component driver")
Signed-off-by: Shengjiu Wang <redacted>
---
 sound/soc/fsl/fsl_mqs.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_mqs.c b/sound/soc/fsl/fsl_mqs.c
index b44b134390a3..69aeb0e71844 100644
--- a/sound/soc/fsl/fsl_mqs.c
+++ b/sound/soc/fsl/fsl_mqs.c

@@ -265,10 +265,20 @@ static int fsl_mqs_remove(struct platform_device *pdev)
 static int fsl_mqs_runtime_resume(struct device *dev)
 {
 	struct fsl_mqs *mqs_priv = dev_get_drvdata(dev);
+	int ret;
 
-	clk_prepare_enable(mqs_priv->ipg);
+	ret = clk_prepare_enable(mqs_priv->ipg);
+	if (ret) {
+		dev_err(dev, "failed to enable ipg clock\n");
+		return ret;
+	}
 
-	clk_prepare_enable(mqs_priv->mclk);
+	ret = clk_prepare_enable(mqs_priv->mclk);
+	if (ret) {
+		dev_err(dev, "failed to enable mclk clock\n");
+		clk_disable_unprepare(mqs_priv->ipg);
+		return ret;
+	}
 
 	if (mqs_priv->use_gpr)
 		regmap_write(mqs_priv->regmap, IOMUXC_GPR2,

-- 
2.21.0

On Tue, Jun 23, 2020 at 02:01:11PM +0800, Shengjiu Wang wrote:

Because clk_prepare_enable and clk_disable_unprepare should
check input clock parameter is NULL or not internally, then
we don't need to check them before calling the function.

Fixes: 9e28f6532c61 ("ASoC: fsl_mqs: Add MQS component driver")
Signed-off-by: Shengjiu Wang <redacted>

Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>

On Tue, Jun 23, 2020 at 02:01:12PM +0800, Shengjiu Wang wrote:

Fix unchecked return value for clk_prepare_enable, add error
handler in fsl_mqs_runtime_resume.

Fixes: 9e28f6532c61 ("ASoC: fsl_mqs: Add MQS component driver")
Signed-off-by: Shengjiu Wang <redacted>

Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>

On Tue, 23 Jun 2020 14:01:10 +0800, Shengjiu Wang wrote:

First patch is to remove the check of clock pointer before calling
clk API.

Second patch is to fix the issue that the return value of
clk_prepare_enable is not checked.

changes in v2:
- split the patch to separate patches

[...]

Applied to

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

Thanks!

[1/2] ASoC: fsl_mqs: Don't check clock is NULL before calling clk API
      commit: adf46113a608d9515801997fc96cbfe8ffa89ed3
[2/2] ASoC: fsl_mqs: Fix unchecked return value for clk_prepare_enable
      commit: 15217d170a4461c1d4c1ea7c497e1fc1122e42a9

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