spi: xlp: fix error return code in xlp_spi_probe()

platform_get_irq() returns an error code, but the spi-xlp driver ignores
it and always returns -EINVAL. 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: Mark Brown <broonie@kernel.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/spi/spi-xlp.c b/drivers/spi/spi-xlp.c
index 80cb4d6af892..74a01b09a8a5 100644
--- a/drivers/spi/spi-xlp.c
+++ b/drivers/spi/spi-xlp.c
@@ -393,8 +393,8 @@ static int xlp_spi_probe(struct platform_device *pdev)
 
         irq = platform_get_irq(pdev, 0);
         if (irq < 0) {
-                dev_err(&pdev->dev, "no IRQ resource found\n");
-                return -EINVAL;
+                dev_err(&pdev->dev, "no IRQ resource found: %d\n", irq);
+                return irq;
         }
         err = devm_request_irq(&pdev->dev, irq, xlp_spi_interrupt, 0,
                         pdev->name, xspi);