Messages in this thread Patch in this message | | | From | Oleksandr Andrushchenko <> | Subject | [Xen-devel][PATCH] Input: xen-kbdfront - signal the backend that we disconnect | Date | Fri, 15 Mar 2019 11:23:48 +0200 |
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From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
While disconnecting from the backend we clean up shared resources (event channel, ring buffer), but never let the backend know about that. This may lead to inconsistent backend state and/or shared resources use. Fix this by explicitly letting the backend know that frontend has destroyed shared resources by changing its Xen bus state accordingly.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> --- drivers/input/misc/xen-kbdfront.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c index 24bc5c5d876f..ecb6e719e0e2 100644 --- a/drivers/input/misc/xen-kbdfront.c +++ b/drivers/input/misc/xen-kbdfront.c @@ -488,6 +488,8 @@ static int xenkbd_connect_backend(struct xenbus_device *dev, static void xenkbd_disconnect_backend(struct xenkbd_info *info) { + xenbus_switch_state(info->xbdev, XenbusStateClosing); + if (info->irq >= 0) unbind_from_irqhandler(info->irq, info); info->irq = -1; -- 2.21.0
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