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driver core: Avoid binding drivers to dead devices

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Commit 3451a495ef ("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: 3451a495ef ("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/de88a23a6fe0ef70f7cfd13c8aea9ab51b4edab6.1594214103.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Wunner 2020-07-08 15:27:01 +02:00 committed by Greg Kroah-Hartman
parent eea2c51f81
commit 654888327e
1 changed files with 3 additions and 1 deletions
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4
drivers/base/dd.c
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@ -864,7 +864,9 @@ static int __device_attach(struct device *dev, bool allow_async)
int ret = 0; int ret = 0;
device_lock(dev); device_lock(dev);
if (dev->driver) { if (dev->p->dead) {
goto out_unlock;
} else if (dev->driver) {
if (device_is_bound(dev)) { if (device_is_bound(dev)) {
ret = 1; ret = 1;
goto out_unlock; goto out_unlock;