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Subject[PATCH] mfd: fsl-imx25: Fix an error handling path in mx25_tsadc_setup_irq()
Date
If devm_of_platform_populate() fails, some resources need to be
released.

Introduce a mx25_tsadc_unset_irq() function that undoes
mx25_tsadc_setup_irq() and call it both from the new error handling path
of the probe and in the remove function.

Fixes: a55196eff6d6 ("mfd: fsl-imx25: Use devm_of_platform_populate()")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
mx25_tsadc_setup_irq() and mx25_tsadc_unset_irq() are not symetrical.
One tests for "(irq <= 0)" while the other one tests for "(irq)".

If <0 the probe will fails, so that is fine.
If ==0, according to doc platform_get_irq() can't return 0, so that should
be fine as well.


That said, I think that the "if (irq)" in mx25_tsadc_unset_irq() can be
removed.
---
drivers/mfd/fsl-imx25-tsadc.c | 32 ++++++++++++++++++++++++--------
1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/fsl-imx25-tsadc.c b/drivers/mfd/fsl-imx25-tsadc.c
index 37e5e02a1d05..85f7982d26d2 100644
--- a/drivers/mfd/fsl-imx25-tsadc.c
+++ b/drivers/mfd/fsl-imx25-tsadc.c
@@ -84,6 +84,19 @@ static int mx25_tsadc_setup_irq(struct platform_device *pdev,
return 0;
}

+static int mx25_tsadc_unset_irq(struct platform_device *pdev)
+{
+ struct mx25_tsadc *tsadc = platform_get_drvdata(pdev);
+ int irq = platform_get_irq(pdev, 0);
+
+ if (irq) {
+ irq_set_chained_handler_and_data(irq, NULL, NULL);
+ irq_domain_remove(tsadc->domain);
+ }
+
+ return 0;
+}
+
static void mx25_tsadc_setup_clk(struct platform_device *pdev,
struct mx25_tsadc *tsadc)
{
@@ -171,18 +184,21 @@ static int mx25_tsadc_probe(struct platform_device *pdev)

platform_set_drvdata(pdev, tsadc);

- return devm_of_platform_populate(dev);
+ ret = devm_of_platform_populate(dev);
+ if (ret)
+ goto err_irq;
+
+ return 0;
+
+err_irq:
+ mx25_tsadc_unset_irq(pdev);
+
+ return ret;
}

static int mx25_tsadc_remove(struct platform_device *pdev)
{
- struct mx25_tsadc *tsadc = platform_get_drvdata(pdev);
- int irq = platform_get_irq(pdev, 0);
-
- if (irq) {
- irq_set_chained_handler_and_data(irq, NULL, NULL);
- irq_domain_remove(tsadc->domain);
- }
+ mx25_tsadc_unset_irq(pdev);

return 0;
}
--
2.34.1
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