linux-kernel - [PATCH 3.16 08/63] usbip: usbip_host: delete device from busid

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Date:   Sat, 22 Sep 2018 01:15:42 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Shuah Khan (Samsung OSG)" <shuah@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.16 08/63] usbip: usbip_host: delete device from
 busid_table after rebind

3.16.58-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Shuah Khan (Samsung OSG)" <shuah@...nel.org>

commit 1e180f167d4e413afccbbb4a421b48b2de832549 upstream.

Device is left in the busid_table after unbind and rebind. Rebind
initiates usb bus scan and the original driver claims the device.
After rescan the device should be deleted from the busid_table as
it no longer belongs to usbip_host.

Fix it to delete the device after device_attach() succeeds.

Signed-off-by: Shuah Khan (Samsung OSG) <shuah@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/staging/usbip/stub_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/staging/usbip/stub_main.c
+++ b/drivers/staging/usbip/stub_main.c
@@ -205,6 +205,9 @@ static ssize_t rebind_store(struct devic
 	if (!bid)
 		return -ENODEV;
 
+	/* mark the device for deletion so probe ignores it during rescan */
+	bid->status = STUB_BUSID_OTHER;
+
 	/* device_attach() callers should hold parent lock for USB */
 	if (bid->udev->dev.parent)
 		device_lock(bid->udev->dev.parent);
@@ -216,6 +219,9 @@ static ssize_t rebind_store(struct devic
 		return ret;
 	}
 
+	/* delete device from busid_table */
+	del_match_busid((char *) buf);
+
 	return count;
 }