linux-kernel - [PATCH AUTOSEL 4.4 58/65] spi: xlp: fix error return code in xlp_spi

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Message-Id: <20181025141705.213937-58-sashal@kernel.org>
Date:   Thu, 25 Oct 2018 10:16:58 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.4 58/65] spi: xlp: fix error return code in xlp_spi_probe()

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>

[ Upstream commit 9a6b94796ae6feaf275ec6200e9b2964db208182 ]

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@...eddedor.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-xlp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-xlp.c b/drivers/spi/spi-xlp.c
index 8f04feca6ee3..0ddb0adaa8aa 100644
--- a/drivers/spi/spi-xlp.c
+++ b/drivers/spi/spi-xlp.c
@@ -392,8 +392,8 @@ 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);
-- 
2.17.1