Re: [PATCH 1/1] usb: return error code when platform_get_irq fails

From: Mathias Nyman
Date: Wed Nov 30 2016 - 09:05:25 EST


On 30.11.2016 15:41, Matthias Brugger wrote:


On 29/11/16 13:57, Pan Bian wrote:
In function xhci_mtk_probe(), variable ret takes the return value. Its
value should be negative on failures. However, when the call to function
platform_get_irq() fails, it does not set the error code, and 0 will be
returned. 0 indicates no error. As a result, the callers of function
xhci_mtk_probe() will not be able to detect the error. This patch fixes
the bug by assigning the return value of platform_get_irq() to variable
ret if it fails.

Signed-off-by: Pan Bian <bianpan2016@xxxxxxx>
---
drivers/usb/host/xhci-mtk.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 79959f1..f2365a4 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -560,8 +560,10 @@ static int xhci_mtk_probe(struct platform_device *pdev)
goto disable_ldos;

irq = platform_get_irq(pdev, 0);
- if (irq < 0)
+ if (irq < 0) {
+ ret = irq;
goto disable_clk;
+ }

/* Initialize dma_mask and coherent_dma_mask to 32-bits */
ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));



Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>


Thanks, Added to queue

-Mathias