kernel/git/next/linux-next.git/drivers/i2c/i2c-mux.c, branch master

i2c: mux: Propagate firmware nodes to channel adapters

2026-09-16T14:20:22+00:00

Device Tree channel nodes are associated with the adapters created by i2c-mux, but equivalent firmware-node descriptions are not. Use generic firmware-node operations for the existing channel lookup and associate the returned node with the adapter. Do not restrict the lookup by firmware-node type, so Device Tree, software nodes, and ACPI descriptions all follow the same property traversal. The existing acpi_preset_companion() call remains in place for the standard ACPI channel association. Keep a separate reference to the node returned by the generic lookup because acpi_preset_companion() may replace the device's primary firmware node. Release the saved reference after adapter deletion. Signed-off-by: Ahmad Byagowi Reviewed-by: Andy Shevchenko Acked-by: Peter Rosin Signed-off-by: Andi Shyti Link: https://patch.msgid.link/00b33b4b352848ff87dd9089190b35d8732676f3.1788623619.git.ahmadexp@gmail.com

i2c: mux: Factor out channel node lookup

2026-09-16T14:20:14+00:00

Move the existing Device Tree channel-node lookup into a helper in preparation for using generic firmware-node operations. This is a pure refactoring with no functional change. Signed-off-by: Ahmad Byagowi Reviewed-by: Andy Shevchenko Acked-by: Peter Rosin Signed-off-by: Andi Shyti Link: https://patch.msgid.link/adf12f66229d5faa0bc75571da1c3f53a1c81dd8.1788623619.git.ahmadexp@gmail.com

i2c: mux: Fix channel node leak on adapter add failure

2026-08-26T13:39:36+00:00

i2c_mux_add_adapter() takes a reference to the Device Tree channel node before registering the new adapter. If adapter registration fails, the error path frees the private data without dropping that reference. Release the channel node before freeing the private data. Fixes: bc45449b1444 ("i2c/of: Automatically populate i2c mux busses from device tree data.") Signed-off-by: Ahmad Byagowi Cc: # v3.5+ Acked-by: Peter Rosin Signed-off-by: Andi Shyti Link: https://patch.msgid.link/b3e46bbee781b3cb4029aca9a71316cc5e36dc17.1787502619.git.ahmadexp@gmail.com

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

i2c: mux: Simplify boolean assignment in i2c_mux_alloc

2025-09-25T21:49:08+00:00

Refactor boolean field assignments of the form `if (a) b = true` to `b = !!(a)` in i2c_mux_alloc. Signed-off-by: I Viswanath Signed-off-by: Wolfram Sang

i2c: use inclusive callbacks in struct i2c_algorithm

2025-06-12T08:05:31+00:00

Convert the I2C subsystem to drop using the 'master_'-prefixed callbacks in favor of the simplified ones. Fix alignment of '=' while here. Signed-off-by: Wolfram Sang

i2c: mux: Remove class argument from i2c_mux_add_adapter()

2024-05-13T14:13:19+00:00

99a741aa7a2d ("i2c: mux: gpio: remove support for class-based device instantiation") removed the last call to i2c_mux_add_adapter() with a non-null class argument. Therefore the class argument can be removed. Note: Class-based device instantiation is a legacy mechanism which shouldn't be used in new code, so we can rule out that this argument may be needed again in the future. Signed-off-by: Heiner Kallweit Reviewed-by: Thomas Zimmermann Acked-by: Peter Rosin Reviewed-by: Laurent Pinchart Acked-by: Jonathan Cameron Acked-by: Rob Herring (Arm) Signed-off-by: Wolfram Sang

i2c: mux: Avoid potential false error message in i2c_mux_add_adapter

2023-09-25T06:22:02+00:00

I2C_CLASS_DEPRECATED is a flag and not an actual class. There's nothing speaking against both, parent and child, having I2C_CLASS_DEPRECATED set. Therefore exclude it from the check. Signed-off-by: Heiner Kallweit Acked-by: Peter Rosin Signed-off-by: Wolfram Sang

i2c: mux: harden i2c_mux_alloc() against integer overflows

2022-09-21T20:12:06+00:00

A couple years back we went through the kernel an automatically converted size calculations to use struct_size() instead. The struct_size() calculation is protected against integer overflows. However it does not make sense to use the result from struct_size() for additional math operations as that would negate any safeness. Fixes: 1f3b69b6b939 ("i2c: mux: Use struct_size() in devm_kzalloc()") Signed-off-by: Dan Carpenter Acked-by: Peter Rosin Reviewed-by: Gustavo A. R. Silva Signed-off-by: Wolfram Sang