From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Subject: [PATCH v2 11/16] driver core: Do not overwrite secondary fwnode with NULL if it is set Date: Mon, 30 Nov 2015 17:11:39 +0200 Message-ID: <1448896304-87928-12-git-send-email-andriy.shevchenko@linux.intel.com> References: <1448896304-87928-1-git-send-email-andriy.shevchenko@linux.intel.com> Return-path: In-Reply-To: <1448896304-87928-1-git-send-email-andriy.shevchenko@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: "Rafael J . Wysocki" , Greg Kroah-Hartman , Jarkko Nikula , linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Lee Jones , Mika Westerberg , Kevin Fenzi , Arnd Bergmann , Wolfram Sang Cc: Andy Shevchenko List-Id: linux-i2c@vger.kernel.org From: Mika Westerberg If multiple devices share single firmware node like it is case with MFD devices, the same firmware node (ACPI) is assigned to all of them. The function also modifies the shared firmware node in order to preserve secondary firmware node of the device in question. If the new device which is sharing the firmware node does not have secondary node it will be NULL which will be assigned to the secondary node of the shared firmware node losing all built-in properties. Prevent this by setting the secondary firmware node only if the replacement is non-NULL. Print also warning if someone tries to overwrite secondary node that has already been assigned. Signed-off-by: Mika Westerberg Signed-off-by: Andy Shevchenko --- drivers/base/core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index b7d56c5..0a8bdad 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -2261,7 +2261,10 @@ void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) if (fwnode_is_primary(fn)) fn = fn->secondary; - fwnode->secondary = fn; + if (fn) { + WARN_ON(fwnode->secondary); + fwnode->secondary = fn; + } dev->fwnode = fwnode; } else { dev->fwnode = fwnode_is_primary(dev->fwnode) ? -- 2.6.2