lwn.git/drivers/of/of_private.h, branch v4.12-rc1

of: fix unittest build without CONFIG_OF_OVERLAY

2017-04-28T21:17:56+00:00

We get a link error when the new tests are used by overlays are not: drivers/of/built-in.o: In function `unflatten_device_tree': (.init.text+0x967): undefined reference to `unittest_unflatten_overlay_base' This makes the #ifdef check match the symbols that lead to building the unittest_unflatten_overlay_base function. Fixes: 81d0848fc8d2 ("of: Add unit tests for applying overlays") Signed-off-by: Arnd Bergmann Reviewed-by: Frank Rowand Tested-by: Frank Rowand Signed-off-by: Rob Herring

of: Add unit tests for applying overlays

2017-04-27T22:26:06+00:00

Existing overlay unit tests examine individual pieces of the overlay code. The new tests target the entire process of applying an overlay. Signed-off-by: Frank Rowand Signed-off-by: Rob Herring

of: fix memory leak related to safe_name()

2016-06-24T20:16:10+00:00

Fix a memory leak resulting from memory allocation in safe_name(). This patch fixes all call sites of safe_name(). Mathieu Malaterre reported the memory leak on boot: On my PowerMac device-tree would generate a duplicate name: [ 0.023043] device-tree: Duplicate name in PowerPC,G4@0, renamed to "l2-cache#1" in this case a newly allocated name is generated by `safe_name`. However in this case it is never deallocated. The bug was found using kmemleak reported as: unreferenced object 0xdf532e60 (size 32): comm "swapper", pid 1, jiffies 4294892300 (age 1993.532s) hex dump (first 32 bytes): 6c 32 2d 63 61 63 68 65 23 31 00 dd e4 dd 1e c2 l2-cache#1...... ec d4 ba ce 04 ec cc de 8e 85 e9 ca c4 ec cc 9e ................ backtrace: [] kvasprintf+0x64/0xc8 [] kasprintf+0x4c/0x5c [] safe_name.isra.1+0x80/0xc4 [] __of_attach_node_sysfs+0x6c/0x11c [] of_core_init+0x8c/0xf8 [] kernel_init_freeable+0xd4/0x208 [] kernel_init+0x24/0x11c [] ret_from_kernel_thread+0x5c/0x64 Link: https://bugzilla.kernel.org/show_bug.cgi?id=120331 Signed-off-by: Frank Rowand Reported-by: mathieu.malaterre@gmail.com Tested-by: Mathieu Malaterre Cc: stable@vger.kernel.org Signed-off-by: Rob Herring

drivers/of: Export OF changeset functions

2016-01-13T22:10:37+00:00

The PowerNV PCI hotplug driver is going to use the OF changeset to manage the changed device sub-tree. This exports those OF changeset functions for that. Signed-off-by: Gavin Shan Acked-by: Wolfram Sang Tested-by: Wolfram Sang Signed-off-by: Rob Herring

of: Refactor __of_node_alloc() into __of_node_dup()

2014-11-24T22:24:41+00:00

Add a node argument to __of_node_alloc() and rename it to __of_node_dup() so that it can also be used to duplicate a node with its properties. This is important for the overlay code so that it can create new nodes without using separate changeset items for every single property. At the same time rework the overlay code to use the new function and drop the extra changeset items. Signed-off-by: Grant Likely

of: Use vargs in __of_node_alloc

2014-11-24T22:23:35+00:00

The overlay code needs to construct a new full_name from the parent name and the node name, but the current method has to allocate and then free an temporary string which is wasteful. Fix this problem by using vargs to pass in a format and arguments into __of_node_alloc(). At the same time remove the allocflags argument to __of_node_alloc(). The only users all use GFP_KERNEL, so there is no need to provide it as an option. If there is ever a need later it can be added back. Signed-off-by: Grant Likely

of: Transactional DT support.

2014-07-23T23:29:15+00:00

Introducing DT transactional support. A DT transaction is a method which allows one to apply changes in the live tree, in such a way that either the full set of changes take effect, or the state of the tree can be rolled-back to the state it was before it was attempted. An applied transaction can be rolled-back at any time. Documentation is in Documentation/devicetree/changesets.txt Signed-off-by: Pantelis Antoniou [glikely: Removed device notifiers and reworked to be more consistent] Signed-off-by: Grant Likely

of: Reorder device tree changes and notifiers

2014-07-23T23:08:13+00:00

Currently, devicetree reconfig notifiers get emitted before the change is applied to the tree, but that behaviour is problematic if the receiver wants the determine the new state of the tree. The current users don't care, but the changeset code to follow will be making multiple changes at once. Reorder notifiers to get emitted after the change has been applied to the tree so that callbacks see the new tree state. At the same time, fixup the existing callbacks to expect the new order. There are a few callbacks that compare the old and new values of a changed property. Put both property pointers into the of_prop_reconfig structure. The current notifiers also allow the notifier callback to fail and cancel the change to the tree, but that feature isn't actually used. It really isn't valid to ignore a tree modification provided by firmware anyway, so remove the ability to cancel a change to the tree. Signed-off-by: Grant Likely Cc: Nathan Fontenot

of: Move dynamic node fixups out of powerpc and into common code

2014-07-23T23:05:46+00:00

PowerPC does an odd thing with dynamic nodes. It uses a notifier to catch new node additions and set some of the values like name and type. This makes no sense since that same code can be put directly into of_attach_node(). Besides, all dynamic node users need this, not just powerpc. Fix this problem by moving the logic out of arch/powerpc and into drivers/of/dynamic.c. It is also important to remove this notifier because we want to move the firing of notifiers from before the tree is modified to after so that the receiver gets a consistent view of the tree, but that is incompatible with notifiers that modify the node. Signed-off-by: Grant Likely Cc: Nathan Fontenot Cc: Benjamin Herrenschmidt

of: Make devicetree sysfs update functions consistent.

2014-07-23T23:05:06+00:00

All of the DT modification functions are split into two parts, the first part manipulates the DT data structure, and the second part updates sysfs, but the code isn't very consistent about how the second half is called. They don't all enforce the same rules about when it is valid to update sysfs, and there isn't any clarity on locking. The transactional DT modification feature that is coming also needs access to these functions so that it can perform all the structure changes together, and then all the sysfs updates as a second stage instead of doing each one at a time. Fix up the second have by creating a separate __of_*_sysfs() function for each of the helpers. The new functions have consistent naming (ie. of_node_add() becomes __of_attach_node_sysfs()) and all of them now defer if of_init hasn't been called yet. Callers of the new functions must hold the of_mutex to ensure there are no race conditions with of_init(). The mutex ensures that there will only ever be one writer to the tree at any given time. There can still be any number of readers and the raw_spin_lock is still used to make sure access to the data structure is still consistent. Finally, put the function prototypes into of_private.h so they are accessible to the transaction code. Signed-off-by: Pantelis Antoniou [grant.likely: Changed suffix from _post to _sysfs to match existing code] [grant.likely: Reorganized to eliminate trivial wrappers] Signed-off-by: Grant Likely