redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

gpu: host1x: Detach driver on unregister 

[ Upstream commit d9a0a05bf8 ]

Currently when a host1x device driver is unregistered, it is not
detached from the host1x controller, which means that the device
will stay around and when the driver is registered again, it may
bind to the old, stale device rather than the new one that was
created from scratch upon driver registration. This in turn can
cause various weird crashes within the driver core because it is
confronted with a device that was already deleted.

Fix this by detaching the driver from the host1x controller when
it is unregistered. This ensures that the deleted device also is
no longer present in the device list that drivers will bind to.

Reported-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Tested-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Thierry Reding 2020-04-08 19:38:02 +02:00 committed by Greg Kroah-Hartman
parent d78a975525
commit 408ddca5c7
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/host1x/bus.c
View File

@ -686,8 +686,17 @@ EXPORT_SYMBOL(host1x_driver_register_full);
*/
void host1x_driver_unregister(struct host1x_driver *driver)
{
struct host1x *host1x;
driver_unregister(&driver->driver);
mutex_lock(&devices_lock);
list_for_each_entry(host1x, &devices, list)
host1x_detach_driver(host1x, driver);
mutex_unlock(&devices_lock);
mutex_lock(&drivers_lock);
list_del_init(&driver->list);
mutex_unlock(&drivers_lock);