| Message ID | 05a7fd22719008c8a905d6328aa9548ce40f2a7a.1661599671.git.christophe.jaillet@wanadoo.fr (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | spi: mt7621: Fix an erroneous message + clean-ups | expand |
On 27/08/2022 13:42, Christophe JAILLET wrote: > The devm_clk_get_enabled() helper: > - calls devm_clk_get() > - calls clk_prepare_enable() and registers what is needed in order to > call clk_disable_unprepare() when needed, as a managed resource. > > This helper is well suited for cases where the clock would be kept > prepared or enabled for the whole lifetime of the driver. > > This simplifies the error handling a lot. > > The order between spi_unregister_controller() (in the remove function) and > the clk_disable_unprepare() (now handle by a managed resource) is kept > the same. > (see commit 46b5c4fb87ce ("spi: mt7621: Don't leak SPI master in probe > error path") to see why it matters) > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> > --- > The order with devm_spi_release_controller() (which undoes > devm_spi_alloc_master()) is reversed, but I don't think it is an issue. > --- > drivers/spi/spi-mt7621.c | 14 +------------- > 1 file changed, 1 insertion(+), 13 deletions(-) > > diff --git a/drivers/spi/spi-mt7621.c b/drivers/spi/spi-mt7621.c > index 351b0ef52bbc..2580b28042be 100644 > --- a/drivers/spi/spi-mt7621.c > +++ b/drivers/spi/spi-mt7621.c > @@ -327,7 +327,6 @@ static int mt7621_spi_probe(struct platform_device *pdev) > struct spi_controller *master; > struct mt7621_spi *rs; > void __iomem *base; > - int status = 0; > struct clk *clk; > int ret; > > @@ -339,19 +338,14 @@ static int mt7621_spi_probe(struct platform_device *pdev) > if (IS_ERR(base)) > return PTR_ERR(base); > > - clk = devm_clk_get(&pdev->dev, NULL); > + clk = devm_clk_get_enabled(&pdev->dev, NULL); > if (IS_ERR(clk)) > return dev_err_probe(&pdev->dev, PTR_ERR(clk), > "unable to get SYS clock\n"); > > - status = clk_prepare_enable(clk); > - if (status) > - return status; > - > master = devm_spi_alloc_master(&pdev->dev, sizeof(*rs)); > if (!master) { > dev_info(&pdev->dev, "master allocation failed\n"); > - clk_disable_unprepare(clk); > return -ENOMEM; > } > > @@ -376,13 +370,10 @@ static int mt7621_spi_probe(struct platform_device *pdev) > ret = device_reset(&pdev->dev); > if (ret) { > dev_err(&pdev->dev, "SPI reset failed!\n"); > - clk_disable_unprepare(clk); > return ret; > } > > ret = spi_register_controller(master); > - if (ret) > - clk_disable_unprepare(clk); > > return ret; > } > @@ -390,13 +381,10 @@ static int mt7621_spi_probe(struct platform_device *pdev) > static int mt7621_spi_remove(struct platform_device *pdev) > { > struct spi_controller *master; > - struct mt7621_spi *rs; > > master = dev_get_drvdata(&pdev->dev); > - rs = spi_controller_get_devdata(master); > > spi_unregister_controller(master); > - clk_disable_unprepare(rs->clk); > > return 0; > }
Il 27/08/22 13:42, Christophe JAILLET ha scritto: > The devm_clk_get_enabled() helper: > - calls devm_clk_get() > - calls clk_prepare_enable() and registers what is needed in order to > call clk_disable_unprepare() when needed, as a managed resource. > > This helper is well suited for cases where the clock would be kept > prepared or enabled for the whole lifetime of the driver. > > This simplifies the error handling a lot. > > The order between spi_unregister_controller() (in the remove function) and > the clk_disable_unprepare() (now handle by a managed resource) is kept > the same. > (see commit 46b5c4fb87ce ("spi: mt7621: Don't leak SPI master in probe > error path") to see why it matters) > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> > Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
diff --git a/drivers/spi/spi-mt7621.c b/drivers/spi/spi-mt7621.c index 351b0ef52bbc..2580b28042be 100644 --- a/drivers/spi/spi-mt7621.c +++ b/drivers/spi/spi-mt7621.c @@ -327,7 +327,6 @@ static int mt7621_spi_probe(struct platform_device *pdev) struct spi_controller *master; struct mt7621_spi *rs; void __iomem *base; - int status = 0; struct clk *clk; int ret; @@ -339,19 +338,14 @@ static int mt7621_spi_probe(struct platform_device *pdev) if (IS_ERR(base)) return PTR_ERR(base); - clk = devm_clk_get(&pdev->dev, NULL); + clk = devm_clk_get_enabled(&pdev->dev, NULL); if (IS_ERR(clk)) return dev_err_probe(&pdev->dev, PTR_ERR(clk), "unable to get SYS clock\n"); - status = clk_prepare_enable(clk); - if (status) - return status; - master = devm_spi_alloc_master(&pdev->dev, sizeof(*rs)); if (!master) { dev_info(&pdev->dev, "master allocation failed\n"); - clk_disable_unprepare(clk); return -ENOMEM; } @@ -376,13 +370,10 @@ static int mt7621_spi_probe(struct platform_device *pdev) ret = device_reset(&pdev->dev); if (ret) { dev_err(&pdev->dev, "SPI reset failed!\n"); - clk_disable_unprepare(clk); return ret; } ret = spi_register_controller(master); - if (ret) - clk_disable_unprepare(clk); return ret; } @@ -390,13 +381,10 @@ static int mt7621_spi_probe(struct platform_device *pdev) static int mt7621_spi_remove(struct platform_device *pdev) { struct spi_controller *master; - struct mt7621_spi *rs; master = dev_get_drvdata(&pdev->dev); - rs = spi_controller_get_devdata(master); spi_unregister_controller(master); - clk_disable_unprepare(rs->clk); return 0; }
The devm_clk_get_enabled() helper: - calls devm_clk_get() - calls clk_prepare_enable() and registers what is needed in order to call clk_disable_unprepare() when needed, as a managed resource. This helper is well suited for cases where the clock would be kept prepared or enabled for the whole lifetime of the driver. This simplifies the error handling a lot. The order between spi_unregister_controller() (in the remove function) and the clk_disable_unprepare() (now handle by a managed resource) is kept the same. (see commit 46b5c4fb87ce ("spi: mt7621: Don't leak SPI master in probe error path") to see why it matters) Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- The order with devm_spi_release_controller() (which undoes devm_spi_alloc_master()) is reversed, but I don't think it is an issue. --- drivers/spi/spi-mt7621.c | 14 +------------- 1 file changed, 1 insertion(+), 13 deletions(-)