maiblox: mediatek: Fix handling of platform_get_irq() error

platform_get_irq() returns -ERRNO on error.  In such case casting to u32
and comparing to 0 would pass the check.

Fixes: 623a6143a845 ("mailbox: mediatek: Add Mediatek CMDQ driver")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index 484d443..5665b6e 100644 (file)
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -69,7 +69,7 @@ struct cmdq_task {
 struct cmdq {
        struct mbox_controller  mbox;
        void __iomem            *base;
-       u32                     irq;
+       int                     irq;
        u32                     thread_nr;
        u32                     irq_mask;
        struct cmdq_thread      *thread;
@@ -525,10 +525,8 @@ static int cmdq_probe(struct platform_device *pdev)
        }
 
        cmdq->irq = platform_get_irq(pdev, 0);
-       if (!cmdq->irq) {
-               dev_err(dev, "failed to get irq\n");
-               return -EINVAL;
-       }
+       if (cmdq->irq < 0)
+               return cmdq->irq;
 
        plat_data = (struct gce_plat *)of_device_get_match_data(dev);
        if (!plat_data) {