kernel/linux.git/drivers/misc/mei/bus.c, branch linux-7.0.y

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

Merge tag 'char-misc-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2025-10-04T23:26:32+00:00

Pull Char/Misc/IIO/Binder updates from Greg KH: "Here is the big set of char/misc/iio and other driver subsystem changes for 6.18-rc1. Loads of different stuff in here, it was a busy development cycle in lots of different subsystems, with over 27k new lines added to the tree. Included in here are: - IIO updates including new drivers, reworking of existing apis, and other goodness in the sensor subsystems - MEI driver updates and additions - NVMEM driver updates - slimbus removal for an unused driver and some other minor updates - coresight driver updates and additions - MHI driver updates - comedi driver updates and fixes - extcon driver updates - interconnect driver additions - eeprom driver updates and fixes - minor UIO driver updates - tiny W1 driver updates But the majority of new code is in the rust bindings and additions, which includes: - misc driver rust binding updates for read/write support, we can now write "normal" misc drivers in rust fully, and the sample driver shows how this can be done. - Initial framework for USB driver rust bindings, which are disabled for now in the build, due to limited support, but coming in through this tree due to dependencies on other rust binding changes that were in here. I'll be enabling these back on in the build in the usb.git tree after -rc1 is out so that developers can continue to work on these in linux-next over the next development cycle. - Android Binder driver implemented in Rust. This is the big one, and was driving a huge majority of the rust binding work over the past years. Right now there are two binder drivers in the kernel, selected only at build time as to which one to use as binder wants to be included in the system at boot time. The binder C maintainers all agreed on this, as eventually, they want the C code to be removed from the tree, but it will take a few releases to get there while both are maintained to ensure that the rust implementation is fully stable and compliant with the existing userspace apis. All of these have been in linux-next for a while" * tag 'char-misc-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (320 commits) rust: usb: keep usb::Device private for now rust: usb: don't retain device context for the interface parent USB: disable rust bindings from the build for now samples: rust: add a USB driver sample rust: usb: add basic USB abstractions coresight: Add label sysfs node support dt-bindings: arm: Add label in the coresight components coresight: tnoc: add new AMBA ID to support Trace Noc V2 coresight: Fix incorrect handling for return value of devm_kzalloc coresight: tpda: fix the logic to setup the element size coresight: trbe: Return NULL pointer for allocation failures coresight: Refactor runtime PM coresight: Make clock sequence consistent coresight: Refactor driver data allocation coresight: Consolidate clock enabling coresight: Avoid enable programming clock duplicately coresight: Appropriately disable trace bus clocks coresight: Appropriately disable programming clocks coresight: etm4x: Support atclk coresight: catu: Support atclk ...

mei: bus: add mei_cldev_mtu interface

2025-09-18T16:31:50+00:00

Add a new helper function that allows MEI client drivers to query the maximum transmission unit (MTU) for a connected MEI client. This is useful for clients that need to transmit large payloads, such as firmware blobs, allowing them to determine the maximum message size that can be safely sent before starting transmission and size of the buffer to allocate when receiving data. Reviewed-by: Mika Westerberg Signed-off-by: Alexander Usyskin Signed-off-by: Badal Nilawar Reviewed-by: Umesh Nerlige Ramappa Signed-off-by: Rodrigo Vivi Acked-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20250905154953.3974335-2-badal.nilawar@intel.com Signed-off-by: Lucas De Marchi

mei: bus: demote error on connect

2025-09-18T16:29:33+00:00

There are flows, like exit from D3cold where connect via bus can fail. Demote error print to debug level to unclutter dmesg. Signed-off-by: Alexander Usyskin Signed-off-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20250918130435.3327400-5-alexander.usyskin@intel.com

mei: hook mei_device on class device

2025-09-06T17:50:54+00:00

mei_device lifetime was managed by devm procedure of parent device. But such memory is freed on device_del. Mei_device object is used by client object that may be alive after parent device is removed. It may lead to use-after-free if discrete graphics driver unloads mei_gsc auxiliary device while user-space holds open handle to mei character device. Connect mei_device structure lifteme to mei class device lifetime by adding mei_device free to class device remove callback. Move exising parent device pointer to separate field in mei_device to avoid misuse. Allocate character device dynamically and allow to control its own lifetime as it may outlive mei_device structure while character device closes after parent device is removed from the system. Leave power management on parent device as we overwrite pci runtime pm procedure and user-space is expecting it there. Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14201 Signed-off-by: Alexander Usyskin Link: https://lore.kernel.org/r/20250826125617.1166546-1-alexander.usyskin@intel.com Signed-off-by: Greg Kroah-Hartman

mei: bus: use cldev in prints

2025-07-19T07:57:53+00:00

For unifomity, print using client device on bus where possible. Signed-off-by: Alexander Usyskin Link: https://lore.kernel.org/r/20250717141112.1696482-2-alexander.usyskin@intel.com Signed-off-by: Greg Kroah-Hartman

mei: bus: Check for still connected devices in mei_cl_bus_dev_release()

2025-06-24T15:39:02+00:00

mei_cl_bus_dev_release() also frees the mei-client (struct mei_cl) belonging to the device being released. If there are bugs like the just fixed bug in the ACE/CSI2 mei drivers, the mei-client being freed might still be part of the mei_device's file_list and iterating over this list after the freeing will then trigger a use-afer-free bug. Add a check to mei_cl_bus_dev_release() to make sure that the to-be-freed mei-client is not on the mei_device's file_list. Signed-off-by: Hans de Goede Link: https://lore.kernel.org/r/20250623085052.12347-11-hansg@kernel.org Signed-off-by: Greg Kroah-Hartman

mei: bus: replace sprintf/scnprintf with sysfs_emit in show functions

2025-06-24T15:38:42+00:00

Update all device attribute show callbacks in the MEI bus driver to use sysfs_emit(), as recommended by Documentation/filesystems/sysfs.rst. This improves consistency and aligns with current sysfs guidelines, even though the existing use of sprintf/scnprintf is functionally safe. Signed-off-by: Moon Hee Lee Acked-by: Alexander Usyskin Link: https://lore.kernel.org/r/20250620181144.10750-1-moonhee.lee.ca@gmail.com Signed-off-by: Greg Kroah-Hartman

mei: Remove unused functions

2025-02-20T14:24:13+00:00

The following functions have been in the mei code for a long time but have never been used. mei_txe_setup_satt2() was added in 2014 by commit 32e2b59fca2c ("mei: txe: add hw-txe.c") mei_me_cl_rm_by_uuid_id() was added in 2015 by commit 79563db9ddd3 ("mei: add reference counting for me clients") mei_cldev_uuid() was added in 2015 by commit baeacd037697 ("mei: bus: export uuid and protocol version to mei_cl bus drivers") mei_cldev_recv_nonblock() was added in 2016 by commit 076802d00615 ("mei: bus: enable non-blocking RX") it is the only user of mei_cldev_recv_nonblock_vtag(). Remove them. Signed-off-by: Dr. David Alan Gilbert Acked-by: Arnd Bergmann Reviewed-by: Alexander Usyskin Link: https://lore.kernel.org/r/20250130012654.255119-1-linux@treblig.org Signed-off-by: Greg Kroah-Hartman