[PATCH 3.16 034/366] spi: pxa2xx: check clk_prepare_enable() return value

Ben Hutchings
2018-11-11T19:49:05Z

From: Tobias Jordan <Tobias.Jordan@elektrobit.com>

commit 62bbc864d1946c715063bd481bff3641fd1324e2 upstream.

clk_prepare_enable() can fail, so its return value should be checked and
acted upon.

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 3343b7a6d2cd ("spi/pxa2xx: convert to the common clk framework")
Signed-off-by: Tobias Jordan <Tobias.Jordan@elektrobit.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/spi/spi-pxa2xx.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)

--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1182,7 +1182,9 @@ static int pxa2xx_spi_probe(struct platf
}

/* Enable SOC clock */
- clk_prepare_enable(ssp->clk);
+ status = clk_prepare_enable(ssp->clk);
+ if (status)
+ goto out_error_dma_irq_alloc;

drv_data->max_clk_rate = clk_get_rate(ssp->clk);

@@ -1221,6 +1223,8 @@ static int pxa2xx_spi_probe(struct platf

out_error_clock_enabled:
clk_disable_unprepare(ssp->clk);
+
+out_error_dma_irq_alloc:
pxa2xx_spi_dma_release(drv_data);
free_irq(ssp->irq, drv_data);

@@ -1296,8 +1300,11 @@ static int pxa2xx_spi_resume(struct devi
pxa2xx_spi_dma_resume(drv_data);

/* Enable the SSP clock */
- if (!pm_runtime_suspended(dev))
- clk_prepare_enable(ssp->clk);
+ if (!pm_runtime_suspended(dev)) {
+ status = clk_prepare_enable(ssp->clk);
+ if (status)
+ return status;
+ }

/* Restore LPSS private register bits */
lpss_ssp_setup(drv_data);
@@ -1325,9 +1332,10 @@ static int pxa2xx_spi_runtime_suspend(st
static int pxa2xx_spi_runtime_resume(struct device *dev)
{
struct driver_data *drv_data = dev_get_drvdata(dev);
+ int status;

- clk_prepare_enable(drv_data->ssp->clk);
- return 0;
+ status = clk_prepare_enable(drv_data->ssp->clk);
+ return status;
}
#endif