From: Lukas Wunner lukas@wunner.de
commit 654888327e9f655a9d55ad477a9583e90e8c9b5c upstream.
Commit 3451a495ef24 ("driver core: Establish order of operations for device_add and device_del via bitflag") sought to prevent asynchronous driver binding to a device which is being removed. It added a per-device "dead" flag which is checked in the following code paths:
* asynchronous binding in __driver_attach_async_helper() * synchronous binding in device_driver_attach() * asynchronous binding in __device_attach_async_helper()
It did *not* check the flag upon:
* synchronous binding in __device_attach()
However __device_attach() may also be called asynchronously from:
deferred_probe_work_func() bus_probe_device() device_initial_probe() __device_attach()
So if the commit's intention was to check the "dead" flag in all asynchronous code paths, then a check is also necessary in __device_attach(). Add the missing check.
Fixes: 3451a495ef24 ("driver core: Establish order of operations for device_add and device_del via bitflag") Signed-off-by: Lukas Wunner lukas@wunner.de Cc: stable@vger.kernel.org # v5.1+ Cc: Alexander Duyck alexander.h.duyck@linux.intel.com Link: https://lore.kernel.org/r/de88a23a6fe0ef70f7cfd13c8aea9ab51b4edab6.159421410... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/base/dd.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -792,7 +792,9 @@ static int __device_attach(struct device int ret = 0;
device_lock(dev); - if (dev->driver) { + if (dev->p->dead) { + goto out_unlock; + } else if (dev->driver) { if (device_is_bound(dev)) { ret = 1; goto out_unlock;