| Message ID | 20220515064126.1424-4-linux.amoon@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Exynos Thermal code inprovement | expand |
On 15/05/2022 08:41, Anand Moon wrote: > All code in clk_disable_unprepare() already checks the clk ptr using > IS_ERR_OR_NULL so there is no need to check it again before calling it. > A lot of other drivers already rely on this behaviour, so it's safe > to do so here. > > Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> > Signed-off-by: Anand Moon <linux.amoon@gmail.com> > --- > v1: improve the commit message > --- > drivers/thermal/samsung/exynos_tmu.c | 12 ++++-------- > 1 file changed, 4 insertions(+), 8 deletions(-) > > diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c > index 1ef90dc52c08..58ff1b577c47 100644 > --- a/drivers/thermal/samsung/exynos_tmu.c > +++ b/drivers/thermal/samsung/exynos_tmu.c > @@ -289,8 +289,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev) > > mutex_lock(&data->lock); > clk_enable(data->clk); > - if (!IS_ERR(data->clk_sec)) > - clk_enable(data->clk_sec); > + clk_enable(data->clk_sec); You say that clk_enable() checks for IS_ERR_OR_NULL. Where? I see only check for non-null case and then immediately taking clk prepare lock. This looks buggy... did you test it? Best regards, Krzysztof
Hi Krzysztof, On Sun, 15 May 2022 at 15:13, Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> wrote: > > On 15/05/2022 08:41, Anand Moon wrote: > > All code in clk_disable_unprepare() already checks the clk ptr using > > IS_ERR_OR_NULL so there is no need to check it again before calling it. > > A lot of other drivers already rely on this behaviour, so it's safe > > to do so here. > > > > Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> > > Signed-off-by: Anand Moon <linux.amoon@gmail.com> > > --- > > v1: improve the commit message > > --- > > drivers/thermal/samsung/exynos_tmu.c | 12 ++++-------- > > 1 file changed, 4 insertions(+), 8 deletions(-) > > > > diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c > > index 1ef90dc52c08..58ff1b577c47 100644 > > --- a/drivers/thermal/samsung/exynos_tmu.c > > +++ b/drivers/thermal/samsung/exynos_tmu.c > > @@ -289,8 +289,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev) > > > > mutex_lock(&data->lock); > > clk_enable(data->clk); > > - if (!IS_ERR(data->clk_sec)) > > - clk_enable(data->clk_sec); > > + clk_enable(data->clk_sec); > > You say that clk_enable() checks for IS_ERR_OR_NULL. Where? I see only > check for non-null case and then immediately taking clk prepare lock. > > This looks buggy... did you test it? Thanks for your review comments Yes have tested the changes, this was last-minute changes will drop this in the next version. > > Best regards, > Krzysztof Thanks & Regards -Anand
diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c index 1ef90dc52c08..58ff1b577c47 100644 --- a/drivers/thermal/samsung/exynos_tmu.c +++ b/drivers/thermal/samsung/exynos_tmu.c @@ -289,8 +289,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev) mutex_lock(&data->lock); clk_enable(data->clk); - if (!IS_ERR(data->clk_sec)) - clk_enable(data->clk_sec); + clk_enable(data->clk_sec); status = readb(data->base + EXYNOS_TMU_REG_STATUS); if (!status) { @@ -323,8 +322,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev) err: clk_disable(data->clk); mutex_unlock(&data->lock); - if (!IS_ERR(data->clk_sec)) - clk_disable(data->clk_sec); + clk_disable(data->clk_sec); out: return ret; } @@ -1119,8 +1117,7 @@ static int exynos_tmu_probe(struct platform_device *pdev) err_thermal: thermal_zone_of_sensor_unregister(&pdev->dev, data->tzd); err_clk_sec: - if (!IS_ERR(data->clk_sec)) - clk_disable_unprepare(data->clk_sec); + clk_disable_unprepare(data->clk_sec); err_sclk: clk_disable_unprepare(data->sclk); err_clk_apbif: @@ -1142,8 +1139,7 @@ static int exynos_tmu_remove(struct platform_device *pdev) clk_disable_unprepare(data->sclk); clk_disable_unprepare(data->clk); - if (!IS_ERR(data->clk_sec)) - clk_disable_unprepare(data->clk_sec); + clk_disable_unprepare(data->clk_sec); if (!IS_ERR(data->regulator)) regulator_disable(data->regulator);
All code in clk_disable_unprepare() already checks the clk ptr using IS_ERR_OR_NULL so there is no need to check it again before calling it. A lot of other drivers already rely on this behaviour, so it's safe to do so here. Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: Anand Moon <linux.amoon@gmail.com> --- v1: improve the commit message --- drivers/thermal/samsung/exynos_tmu.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-)