misc: atmel-ssc: Fix IRQ check in ssc_probe

[ Upstream commit 1c245358ce0b13669f6d1625f7a4e05c41f28980 ]

platform_get_irq() returns negative error number instead 0 on failure.
And the doc of platform_get_irq() provides a usage example:

    int irq = platform_get_irq(pdev, 0);
    if (irq < 0)
        return irq;

Fix the check of return value to catch errors correctly.

Fixes: eb1f2930609b ("Driver for the Atmel on-chip SSC on AT32AP and AT91")
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Link: https://lore.kernel.org/r/20220601123026.7119-1-linmq006@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c
index f9caf233e2cc05225b818857b7bdd340c90f4d50..48521861beb52b5edf1b0d4f8765afc1fb593225 100644 (file)
--- a/drivers/misc/atmel-ssc.c
+++ b/drivers/misc/atmel-ssc.c
@@ -235,9 +235,9 @@ static int ssc_probe(struct platform_device *pdev)
        clk_disable_unprepare(ssc->clk);
 
        ssc->irq = platform_get_irq(pdev, 0);
-       if (!ssc->irq) {
+       if (ssc->irq < 0) {
                dev_dbg(&pdev->dev, "could not get irq\n");
-               return -ENXIO;
+               return ssc->irq;
        }
 
        mutex_lock(&user_lock);