[PATCH] misc: atmel_tclib: fix error return code in tc_probe()

From: Gustavo A. R. Silva
Date: Wed Aug 09 2017 - 12:42:57 EST


platform_get_irq() returns an error code, but the atmel_tclib driver
ignores it and always returns -EINVAL. This is not correct and,
prevents -EPROBE_DEFER from being propagated properly.

Print error message and propagate the return value of platform_get_irq
on failure.

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
---
drivers/misc/atmel_tclib.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/atmel_tclib.c b/drivers/misc/atmel_tclib.c
index ac24a4b..c5d3449 100644
--- a/drivers/misc/atmel_tclib.c
+++ b/drivers/misc/atmel_tclib.c
@@ -112,8 +112,10 @@ static int __init tc_probe(struct platform_device *pdev)
unsigned int i;

irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return -EINVAL;
+ if (irq < 0) {
+ dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
+ return irq;
+ }

tc = devm_kzalloc(&pdev->dev, sizeof(struct atmel_tc), GFP_KERNEL);
if (!tc)
--
2.5.0