Merge tag 'driver-core-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here is the driver core patchset for 4.18-rc1.

  The large chunk of these are firmware core documentation and api
  updates. Nothing major there, just better descriptions for others to
  be able to understand the firmware code better. There's also a user
  for a new firmware api call.

  Other than that, there are some minor updates for debugfs, kernfs, and
  the driver core itself.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'driver-core-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (23 commits)
  driver core: hold dev's parent lock when needed
  driver-core: return EINVAL error instead of BUG_ON()
  driver core: add __printf verification to device_create_groups_vargs
  mm: memory_hotplug: use put_device() if device_register fail
  base: core: fix typo 'can by' to 'can be'
  debugfs: inode: debugfs_create_dir uses mode permission from parent
  debugfs: Re-use kstrtobool_from_user()
  Documentation: clarify firmware_class provenance and why we can't rename the module
  Documentation: remove stale firmware API reference
  Documentation: fix few typos and clarifications for the firmware loader
  ath10k: re-enable the firmware fallback mechanism for testmode
  ath10k: use firmware_request_nowarn() to load firmware
  firmware: add firmware_request_nowarn() - load firmware without warnings
  firmware_loader: make firmware_fallback_sysfs() print more useful
  firmware_loader: move kconfig FW_LOADER entries to its own file
  firmware_loader: replace ---help--- with help
  firmware_loader: enhance Kconfig documentation over FW_LOADER
  firmware_loader: document firmware_sysfs_fallback()
  firmware: rename fw_sysfs_fallback to firmware_fallback_sysfs()
  firmware: use () to terminate kernel-doc function names
  ...

2 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index 00b6c3b42437..e9d4b43c4ead 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -98,6 +98,8 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  * @p:          The private data of the driver core, only the driver core can
  *              touch this.
  * @lock_key:   Lock class key for use by the lock validator
+ * @need_parent_lock:   When probing or removing a device on this bus, the
+ *                      device core should lock the device's parent.
  *
  * A bus is a channel between the processor and one or more devices. For the
  * purposes of the device model, all devices are connected via a bus, even if
@@ -138,6 +140,8 @@ struct bus_type {
 
         struct subsys_private *p;
         struct lock_class_key lock_key;
+
+        bool need_parent_lock;
 };
 
 extern int __must_check bus_register(struct bus_type *bus);
diff --git a/include/linux/firmware.h b/include/linux/firmware.h
index 41050417cafb..2dd566c91d44 100644
--- a/include/linux/firmware.h
+++ b/include/linux/firmware.h
@@ -42,6 +42,8 @@ struct builtin_fw {
 #if defined(CONFIG_FW_LOADER) || (defined(CONFIG_FW_LOADER_MODULE) && defined(MODULE))
 int request_firmware(const struct firmware **fw, const char *name,
                      struct device *device);
+int firmware_request_nowarn(const struct firmware **fw, const char *name,
+                            struct device *device);
 int request_firmware_nowait(
         struct module *module, bool uevent,
         const char *name, struct device *device, gfp_t gfp, void *context,
@@ -59,6 +61,14 @@ static inline int request_firmware(const struct firmware **fw,
 {
         return -EINVAL;
 }
+
+static inline int firmware_request_nowarn(const struct firmware **fw,
+                                          const char *name,
+                                          struct device *device)
+{
+        return -EINVAL;
+}
+
 static inline int request_firmware_nowait(
         struct module *module, bool uevent,
         const char *name, struct device *device, gfp_t gfp, void *context,