linux-kernel - [PATCH] xhci: Fix runtime PM imbalance on error

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Message-Id: <20200521072809.17390-1-dinghao.liu@zju.edu.cn>
Date:   Thu, 21 May 2020 15:28:09 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] xhci: Fix runtime PM imbalance on error

When dma_set_mask_and_coherent() returns an error code,
a pairing runtime PM usage counter decrement is needed
to keep the counter balanced.

Also, call pm_runtime_disable() when dma_set_mask_and_coherent()
returns an error code.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/usb/host/xhci-histb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-histb.c b/drivers/usb/host/xhci-histb.c
index 5546e7e013a8..1d22a664477f 100644
--- a/drivers/usb/host/xhci-histb.c
+++ b/drivers/usb/host/xhci-histb.c
@@ -240,7 +240,7 @@ static int xhci_histb_probe(struct platform_device *pdev)
 	/* Initialize dma_mask and coherent_dma_mask to 32-bits */
 	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 	if (ret)
-		return ret;
+		goto disable_pm
 
 	hcd = usb_create_hcd(driver, dev, dev_name(dev));
 	if (!hcd) {
-- 
2.17.1