linux-kernel - [PATCH v2] USB: usbip: fix stub

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Message-ID: <20230615092810.1215490-1-jonas.blixt@actia.se>
Date:   Thu, 15 Jun 2023 11:28:10 +0200
From:   Jonas Blixt <jonas.blixt@...ia.se>
To:     <shuah@...nel.org>, <valentina.manea.m@...il.com>
CC:     <gregkh@...uxfoundation.org>, <stern@...land.harvard.edu>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Jonas Blixt <jonas.blixt@...ia.se>
Subject: [PATCH v2] USB: usbip: fix stub_dev hub disconnect

If a hub is disconnected that has device(s) that's attached to the usbip layer
the disconnect function might fail because it tries to release the port
on an already disconnected hub.

Fixes: 6080cd0e9239 ("staging: usbip: claim ports used by shared devices")
Signed-off-by: Jonas Blixt <jonas.blixt@...ia.se>
---
v2:
 - Clarify comment
v1:
 Link to v1: https://lore.kernel.org/linux-usb/20230615092205.GA1212960@W388ANL/T/#m575e37dc404067797eadf4444857366c73ba3420
---
 drivers/usb/usbip/stub_dev.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c
index 2305d425e6c9..2170c95c8dab 100644
--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -427,8 +427,13 @@ static void stub_disconnect(struct usb_device *udev)
 	/* release port */
 	rc = usb_hub_release_port(udev->parent, udev->portnum,
 				  (struct usb_dev_state *) udev);
-	if (rc) {
-		dev_dbg(&udev->dev, "unable to release port\n");
+	/*
+	 * NOTE: If a HUB disconnect triggered disconnect of the down stream
+	 * device usb_hub_release_port will return -ENODEV so we can safely ignore
+	 * that error here.
+	 */
+	if (rc && (rc != -ENODEV)) {
+		dev_dbg(&udev->dev, "unable to release port (%i)\n", rc);
 		return;
 	}
 
-- 
2.25.1