[PATCH 3.18 24/45] usbip: usbip_host: delete device from busid_table after rebind

From: Greg Kroah-Hartman
Date: Thu May 24 2018 - 07:20:55 EST


3.18-stable review patch. If anyone has any objections, please let me know.

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

From: Shuah Khan (Samsung OSG) <shuah@xxxxxxxxxx>

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@xxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/usb/usbip/stub_main.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/drivers/usb/usbip/stub_main.c
+++ b/drivers/usb/usbip/stub_main.c
@@ -201,6 +201,9 @@ 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);
@@ -212,6 +215,9 @@ static ssize_t rebind_store(struct devic
return ret;
}

+ /* delete device from busid_table */
+ del_match_busid((char *) buf);
+
return count;
}