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spi: mt7621: Use the devm_clk_get_enabled() helper to simplify error handling

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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 46b5c4fb87 ("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>
Link: https://lore.kernel.org/r/05a7fd22719008c8a905d6328aa9548ce40f2a7a.1661599671.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Christophe JAILLET 2022-08-27 13:42:19 +02:00 committed by Mark Brown
parent 2b2bf6b7fa
commit 3d6af96814
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GPG Key ID: 24D68B725D5487D0
1 changed files with 1 additions and 13 deletions
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14
drivers/spi/spi-mt7621.c
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@ -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;
}