gpu: host1x: fix error return code in host1x_probe()

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@embeddedor.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index 2c58a39..9476a6d 100644 (file)
--- 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);