fbdev: au1200fb: Fix missing IRQ check in au1200fb_drv_probe

[ Upstream commit 4e88761f5f8c7869f15a2046b1a1116f4fab4ac8 ]

This func misses checking for platform_get_irq()'s call and may passes the
negative error codes to request_irq(), which takes unsigned IRQ #,
causing it to fail with -EINVAL, overriding an original error code.

Fix this by stop calling request_irq() with invalid IRQ #s.

Fixes: 1630d85a8312 ("au1200fb: fix hardcoded IRQ")
Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c
index a8a0a448cdb5e9d337fcb746112e6db43c042378..80f54111baec17e7c1232de1f1de50cd3afc3238 100644 (file)
--- a/drivers/video/fbdev/au1200fb.c
+++ b/drivers/video/fbdev/au1200fb.c
@@ -1732,6 +1732,9 @@ static int au1200fb_drv_probe(struct platform_device *dev)
 
        /* Now hook interrupt too */
        irq = platform_get_irq(dev, 0);
+       if (irq < 0)
+               return irq;
+
        ret = request_irq(irq, au1200fb_handle_irq,
                          IRQF_SHARED, "lcd", (void *)dev);
        if (ret) {