From mboxrd@z Thu Jan 1 00:00:00 1970 From: Saravana Kannan Subject: [PATCH v7 6/7] of/platform: Create device links for all child-supplier depencencies Date: Tue, 23 Jul 2019 17:10:59 -0700 Message-ID: <20190724001100.133423-7-saravanak@google.com> References: <20190724001100.133423-1-saravanak@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Return-path: In-Reply-To: <20190724001100.133423-1-saravanak@google.com> Sender: linux-kernel-owner@vger.kernel.org To: Rob Herring , Mark Rutland , Greg Kroah-Hartman , "Rafael J. Wysocki" , Frank Rowand Cc: Saravana Kannan , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, David Collins , kernel-team@android.com List-Id: devicetree@vger.kernel.org A parent device can have child devices that it adds when it probes. But this probing of the parent device can happen way after kernel init is done -- for example, when the parent device's driver is loaded as a module. In such cases, if the child devices depend on a supplier in the system, we need to make sure the supplier gets the sync_state() callback only after these child devices are added and probed. To achieve this, when creating device links for a device by looking at its DT node, don't just look at DT references at the top node level. Look at DT references in all the descendant nodes too and create device links from the ancestor device to all these supplier devices. This way, when the parent device probes and adds child devices, the child devices can then create their own device links to the suppliers and further delay the supplier's sync_state() callback to after the child devices are probed. Example: In this illustration, -> denotes DT references and indentation represents child status. Device node A Device node B -> D Device node C -> B, D Device node D Assume all these devices have their drivers loaded as modules. Without this patch, this is the sequence of events: 1. D is added. 2. A is added. 3. Device D probes. 4. Device D gets its sync_state() callback. 5. Device B and C might malfunction because their resources got altered/turned off before they can make active requests for them. With this patch, this is the sequence of events: 1. D is added. 2. A is added and creates device links to D. 3. Device link from A to B is not added because A is a parent of B. 4. Device D probes. 5. Device D does not get it's sync_state() callback because consumer A hasn't probed yet. 5. Device A probes. 5. a. Devices B and C are added. 5. b. Device links from B and C to D are added. 5. c. Device A's probe completes. 6. Device D does not get it's sync_state() callback because consumer A has probed but consumers B and C haven't probed yet. 7. Device B and C probe. 8. Device D gets it's sync_state() callback because all its consumers have probed. 9. None of the devices malfunction. Signed-off-by: Saravana Kannan --- drivers/of/platform.c | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-) diff --git a/drivers/of/platform.c b/drivers/of/platform.c index 71d6138698ec..41499ddc8d95 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -655,24 +655,35 @@ static bool of_link_property(struct device *dev, struct device_node *con_np, return done ? 0 : -ENODEV; } +static int __of_link_to_suppliers(struct device *dev, + struct device_node *con_np) +{ + struct device_node *child; + struct property *p; + bool done = true; + + for_each_property_of_node(con_np, p) + if (of_link_property(dev, con_np, p->name)) + done = false; + + for_each_child_of_node(con_np, child) + if (__of_link_to_suppliers(dev, child)) + done = false; + + return done ? 0 : -ENODEV; +} + static bool of_devlink; core_param(of_devlink, of_devlink, bool, 0); static int of_link_to_suppliers(struct device *dev) { - struct property *p; - bool done = true; - if (!of_devlink) return 0; if (unlikely(!dev->of_node)) return 0; - for_each_property_of_node(dev->of_node, p) - if (of_link_property(dev, dev->of_node, p->name)) - done = false; - - return done ? 0 : -ENODEV; + return __of_link_to_suppliers(dev, dev->of_node); } #ifndef CONFIG_PPC -- 2.22.0.709.g102302147b-goog