diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-10-22 21:41:00 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-05 13:07:05 +0300 |
| commit | dc1ff223b5f39b7c5f87bb15418f87d639125279 (patch) | |
| tree | 2a0566f3404fbfab1035f5fc7729b65196666efa /drivers/base | |
| parent | d2fcb5720e21c105388b1ca9f136cd8efd72b2e4 (diff) | |
| download | linux-dc1ff223b5f39b7c5f87bb15418f87d639125279.tar.xz | |
device property: Don't clear secondary pointer for shared primary firmware node
commit 99aed9227073fb34ce2880cbc7063e04185a65e1 upstream.
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 <fntoth@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Ferry Toth <fntoth@gmail.com>
Cc: 5.9+ <stable@vger.kernel.org> # 5.9+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 319ef23b628a..05ecc0de2d59 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3074,6 +3074,7 @@ static inline bool fwnode_is_primary(struct fwnode_handle *fwnode) */ void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) { + struct device *parent = dev->parent; struct fwnode_handle *fn = dev->fwnode; if (fwnode) { @@ -3088,7 +3089,8 @@ void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) } else { if (fwnode_is_primary(fn)) { dev->fwnode = fn->secondary; - fn->secondary = ERR_PTR(-ENODEV); + if (!(parent && fn == parent->fwnode)) + fn->secondary = ERR_PTR(-ENODEV); } else { dev->fwnode = NULL; } |