mailbox: mailbox-test: Fix an error check in mbox_test_probe()

mbox_test_request_channel() function returns NULL or
error value embedded in the pointer (PTR_ERR).
Evaluate the return value using IS_ERR_OR_NULL.

Signed-off-by: Minjie Du <duminjie@vivo.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index 91b68cb..22d6018 100644 (file)
--- a/drivers/mailbox/mailbox-test.c
+++ b/drivers/mailbox/mailbox-test.c
@@ -388,7 +388,7 @@ static int mbox_test_probe(struct platform_device *pdev)
        tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
        tdev->rx_channel = mbox_test_request_channel(pdev, "rx");
 
-       if (!tdev->tx_channel && !tdev->rx_channel)
+       if (IS_ERR_OR_NULL(tdev->tx_channel) && IS_ERR_OR_NULL(tdev->rx_channel))
                return -EPROBE_DEFER;
 
        /* If Rx is not specified but has Rx MMIO, then Rx = Tx */