device property: Don't clear secondary pointer for shared primary firmware node

It appears that firmware nodes can be shared between devices. In such case
when a (child) device is about to be deleted, its firmware node may be shared
and ACPI_COMPANION_SET(..., NULL) call for it breaks the secondary link
of the shared primary firmware node.

In order to prevent that, check, if the device has a parent and parent's
firmware node is shared with its child, and avoid crashing the link.

Fixes: c15e1bdda436 ("device property: Fix the secondary firmware node handling in set_primary_fwnode()")
Reported-by: Ferry Toth <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Heikki Krogerus <[email protected]>
Tested-by: Ferry Toth <[email protected]>
Cc: 5.9+ <[email protected]> # 5.9+
Signed-off-by: Rafael J. Wysocki <[email protected]>

0 files changed, 0 insertions, 0 deletions