| Message ID | 20240826014419.5151-1-guoqing.jiang@canonical.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | hwrng: mtk - Add remove function | expand |
On Mon, Aug 26, 2024 at 9:45 AM Guoqing Jiang <guoqing.jiang@canonical.com> wrote: > > Add mtk_rng_remove function which calles pm_runtime relevant funcs > and unregister hwrng to paired with mtk_rng_probe. > > And without remove function, pm_runtime complains below when reload > the driver. > > mtk_rng 1020f000.rng: Unbalanced pm_runtime_enable! > > Signed-off-by: Guoqing Jiang <guoqing.jiang@canonical.com> > --- > drivers/char/hw_random/mtk-rng.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/char/hw_random/mtk-rng.c b/drivers/char/hw_random/mtk-rng.c > index 302e201b51c2..1b6aa9406b11 100644 > --- a/drivers/char/hw_random/mtk-rng.c > +++ b/drivers/char/hw_random/mtk-rng.c > @@ -149,6 +149,15 @@ static int mtk_rng_probe(struct platform_device *pdev) > return 0; > } > > +static void mtk_rng_remove(struct platform_device *pdev) > +{ > + struct mtk_rng *priv = platform_get_drvdata(pdev); > + > + pm_runtime_disable(&pdev->dev); Instead maybe just replace pm_runtime_enable() with devm_pm_runtime_enable() in the probe function? > + pm_runtime_set_suspended(&pdev->dev); Not sure if this is needed? I'm not super familiar with runtime PM. > + devm_hwrng_unregister(&pdev->dev, &priv->rng); The fact that it is already devm_* means that you shouldn't need to call it. ChenYu > +} > + > #ifdef CONFIG_PM > static int mtk_rng_runtime_suspend(struct device *dev) > { > @@ -186,6 +195,7 @@ MODULE_DEVICE_TABLE(of, mtk_rng_match); > > static struct platform_driver mtk_rng_driver = { > .probe = mtk_rng_probe, > + .remove_new = mtk_rng_remove, > .driver = { > .name = MTK_RNG_DEV, > .pm = MTK_RNG_PM_OPS, > -- > 2.34.1 > >
On 8/26/24 13:17, Chen-Yu Tsai wrote: > On Mon, Aug 26, 2024 at 9:45 AM Guoqing Jiang > <guoqing.jiang@canonical.com> wrote: >> Add mtk_rng_remove function which calles pm_runtime relevant funcs >> and unregister hwrng to paired with mtk_rng_probe. >> >> And without remove function, pm_runtime complains below when reload >> the driver. >> >> mtk_rng 1020f000.rng: Unbalanced pm_runtime_enable! >> >> Signed-off-by: Guoqing Jiang <guoqing.jiang@canonical.com> >> --- >> drivers/char/hw_random/mtk-rng.c | 10 ++++++++++ >> 1 file changed, 10 insertions(+) >> >> diff --git a/drivers/char/hw_random/mtk-rng.c b/drivers/char/hw_random/mtk-rng.c >> index 302e201b51c2..1b6aa9406b11 100644 >> --- a/drivers/char/hw_random/mtk-rng.c >> +++ b/drivers/char/hw_random/mtk-rng.c >> @@ -149,6 +149,15 @@ static int mtk_rng_probe(struct platform_device *pdev) >> return 0; >> } >> >> +static void mtk_rng_remove(struct platform_device *pdev) >> +{ >> + struct mtk_rng *priv = platform_get_drvdata(pdev); >> + >> + pm_runtime_disable(&pdev->dev); > Instead maybe just replace pm_runtime_enable() with devm_pm_runtime_enable() > in the probe function? Good point, will try it though it seems the function was not called by any hwrng driver so far. >> + pm_runtime_set_suspended(&pdev->dev); > Not sure if this is needed? I'm not super familiar with runtime PM. > >> + devm_hwrng_unregister(&pdev->dev, &priv->rng); > The fact that it is already devm_* means that you shouldn't need to > call it. Okay, will remove the unnecessary calls. Thanks, Guoqing
diff --git a/drivers/char/hw_random/mtk-rng.c b/drivers/char/hw_random/mtk-rng.c index 302e201b51c2..1b6aa9406b11 100644 --- a/drivers/char/hw_random/mtk-rng.c +++ b/drivers/char/hw_random/mtk-rng.c @@ -149,6 +149,15 @@ static int mtk_rng_probe(struct platform_device *pdev) return 0; } +static void mtk_rng_remove(struct platform_device *pdev) +{ + struct mtk_rng *priv = platform_get_drvdata(pdev); + + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + devm_hwrng_unregister(&pdev->dev, &priv->rng); +} + #ifdef CONFIG_PM static int mtk_rng_runtime_suspend(struct device *dev) { @@ -186,6 +195,7 @@ MODULE_DEVICE_TABLE(of, mtk_rng_match); static struct platform_driver mtk_rng_driver = { .probe = mtk_rng_probe, + .remove_new = mtk_rng_remove, .driver = { .name = MTK_RNG_DEV, .pm = MTK_RNG_PM_OPS,
Add mtk_rng_remove function which calles pm_runtime relevant funcs and unregister hwrng to paired with mtk_rng_probe. And without remove function, pm_runtime complains below when reload the driver. mtk_rng 1020f000.rng: Unbalanced pm_runtime_enable! Signed-off-by: Guoqing Jiang <guoqing.jiang@canonical.com> --- drivers/char/hw_random/mtk-rng.c | 10 ++++++++++ 1 file changed, 10 insertions(+)