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Ludovic Desroches 25e832a783 drm/atmel-hlcdc: fix memory leak from the atomic_destroy_state callback 
[ Upstream commit f123524710 ]

After several commits, the slab memory increases. Some drm_crtc_commit
objects are not freed. The atomic_destroy_state callback only put the
framebuffer. Use the __drm_atomic_helper_plane_destroy_state() function
to put all the objects that are no longer needed.

It has been seen after hours of usage of a graphics application or using
kmemleak:

unreferenced object 0xc63a6580 (size 64):
  comm "egt_basic", pid 171, jiffies 4294940784
  hex dump (first 32 bytes):
    40 50 34 c5 01 00 00 00 ff ff ff ff 8c 65 3a c6  @P4..........e:.
    8c 65 3a c6 ff ff ff ff 98 65 3a c6 98 65 3a c6  .e:......e:..e:.
  backtrace (crc c25aa925):
    kmemleak_alloc+0x34/0x3c
    __kmalloc_cache_noprof+0x150/0x1a4
    drm_atomic_helper_setup_commit+0x1e8/0x7bc
    drm_atomic_helper_commit+0x3c/0x15c
    drm_atomic_commit+0xc0/0xf4
    drm_atomic_helper_set_config+0x84/0xb8
    drm_mode_setcrtc+0x32c/0x810
    drm_ioctl+0x20c/0x488
    sys_ioctl+0x14c/0xc20
    ret_fast_syscall+0x0/0x54

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Reviewed-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Link: https://patch.msgid.link/20251024-lcd_fixes_mainlining-v1-1-79b615130dc3@microchip.com
Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:21:06 -05:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.