patch "xhci: hisilicon: fix refercence leak in xhci_histb_probe" added to usb-linus

This is a note to let you know that I've just added the patch titled

xhci: hisilicon: fix refercence leak in xhci_histb_probe

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 76255470ffa2795a44032e8b3c1ced11d81aa2db Mon Sep 17 00:00:00 2001
From: Zhang Qilong <[email protected]>
Date: Fri, 6 Nov 2020 20:22:21 +0800
Subject: xhci: hisilicon: fix refercence leak in xhci_histb_probe

pm_runtime_get_sync() will increment pm usage at first and it will resume the device later. We should decrease the usage count whetever it succeeded or failed(maybe runtime of the device has error, or device is in inaccessible state, or other error state). If we do not call put operation to decrease the reference, it will result in reference leak in xhci_histb_probe. Moreover, this device cannot enter the idle state and always stay busy or other non-idle state later. So we fixed it by jumping to error handling branch.

---
 drivers/usb/host/xhci-histb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 5546e7e013a8..08369857686e 100644
@@ -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) {

2.29.2