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usb: imx21-hcd: fix error return code in imx21_probe() 

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>
This commit is contained in:
Gustavo A. R. Silva 2017-08-07 23:14:23 -05:00 committed by Greg Kroah-Hartman
parent 99dbff202e
commit 46edf52d08
1 changed files with 4 additions and 2 deletions
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6
drivers/usb/host/imx21-hcd.c
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@ -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));