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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 070/114] usb: imx21-hcd: fix error return code in imx21_probe()
Date:   Thu,  8 Nov 2018 13:51:25 -0800
Message-Id: <20181108215107.390810182@linuxfoundation.org>
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4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 46edf52d08342b3dc1f9a61c5200ab8b1c0f5a37 ]

platform_get_irq() returns an error code, but the imx21-hcd 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 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@embeddedor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/host/imx21-hcd.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/imx21-hcd.c b/drivers/usb/host/imx21-hcd.c
index f542045dc2a6..e25d72e0527f 100644
--- a/drivers/usb/host/imx21-hcd.c
+++ b/drivers/usb/host/imx21-hcd.c
@@ -1849,8 +1849,10 @@ static int imx21_probe(struct platform_device *pdev)
 	if (!res)
 		return -ENODEV;
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return -ENXIO;
+	if (irq < 0) {
+		dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
+		return irq;
+	}
 
 	hcd = usb_create_hcd(&imx21_hc_driver,
 		&pdev->dev, dev_name(&pdev->dev));
-- 
2.17.1