[PATCH] gpu: host1x: fix error return code in host1x_probe()

[PATCH] gpu: host1x: fix error return code in host1x_probe()

[Gustavo A. R. Silva]

platform_get_irq() returns an error code, but the host1x driver
ignores it and always returns -ENXIO. This is not correct and,
prevents -EPROBE_DEFER from being propagated properly.

Notice that platform_get_irq() no longer returns 0 on error:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e330b9a6bb35dc7097a4f02cb1ae7b6f96df92af

Print 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-L1vi/lXTdts+Va1GwOuvDg@public.gmane.org>
---
 drivers/gpu/host1x/dev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index 7782725..7f22c5c 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -134,8 +134,8 @@ static int host1x_probe(struct platform_device *pdev)
 
 	syncpt_irq = platform_get_irq(pdev, 0);
 	if (syncpt_irq < 0) {
-		dev_err(&pdev->dev, "failed to get IRQ\n");
-		return -ENXIO;
+		dev_err(&pdev->dev, "failed to get IRQ: %d\n", syncpt_irq);
+		return syncpt_irq;
 	}
 
 	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
-- 
2.5.0

Re: [PATCH] gpu: host1x: fix error return code in host1x_probe()

[Thierry Reding]

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On Tue, Aug 08, 2017 at 12:08:06AM -0500, Gustavo A. R. Silva wrote:
> platform_get_irq() returns an error code, but the host1x driver
> ignores it and always returns -ENXIO. This is not correct and,
> prevents -EPROBE_DEFER from being propagated properly.
> 
> Notice that platform_get_irq() no longer returns 0 on error:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e330b9a6bb35dc7097a4f02cb1ae7b6f96df92af
> 
> Print 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-L1vi/lXTdts+Va1GwOuvDg@public.gmane.org>
> ---
>  drivers/gpu/host1x/dev.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Applied, thanks.

Thierry

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