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can: rcar_can: fix IRQ check 

rcar_can_probe() regards 0 as a wrong IRQ #, despite platform_get_irq() that it
calls returns negative error code in that case. This leads to the following
being printed to the console when attempting to open the device:

error requesting interrupt fffffffa

because  rcar_can_open() calls request_irq() with a negative IRQ #, and that
function naturally fails with -EINVAL.

Check for the negative error codes instead and propagate them upstream instead
of just returning -ENODEV.

Fixes: fd1159318e ("can: add Renesas R-Car CAN driver")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Sergei Shtylyov 2015-06-20 03:32:46 +03:00 committed by Marc Kleine-Budde
parent 2ee94014d9
commit 5e63e6baa1
1 changed files with 2 additions and 1 deletions
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3
drivers/net/can/rcar_can.c
View File

@ -758,8 +758,9 @@ static int rcar_can_probe(struct platform_device *pdev)
}
irq = platform_get_irq(pdev, 0);
if (!irq) {
if (irq < 0) {
dev_err(&pdev->dev, "No IRQ resource\n");
err = irq;
goto fail;
}