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af4f896f77
The function parse_lfp_panel_dtd() is called when the driver
attempts to initialize the eDP connector, and it allocates memory,
which is recorded in panel->vbt.lfp_vbt_mode. However, since no
eDP panel is connected, the driver fails at intel_edp_init_dpcd()
and follows the failure path. Unfortunately, the allocated memory
is not freed in this case.
To fix this issue, free the memory in the failure path.
leak info from kmemleak:
"
unreferenced object 0xffff8881252f8800 (size 128):
comm "systemd-udevd", pid 192, jiffies 4294896880
hex dump (first 32 bytes):
e8 fd 00 00 00 04 18 04 a0 04 40 05 00 00 00 03 ..........@.....
03 03 09 03 26 03 00 00 0a 00 00 00 00 00 00 00 ....&...........
backtrace (crc 7448f6b4):
[<ffffffff82475c9b>] kmemleak_alloc+0x4b/0x80
[<ffffffff814bb50e>] __kmalloc_cache_noprof+0x2be/0x390
[<ffffffffa069862c>] intel_bios_init_panel+0x1c4c/0x2720 [xe]
[<ffffffffa0699123>] intel_bios_init_panel_early+0x13/0x20 [xe]
[<ffffffffa06fceb9>] intel_dp_init_connector+0x2f9/0x1080 [xe]
[<ffffffffa06c370a>] intel_ddi_init+0xbba/0xf50 [xe]
[<ffffffffa069b906>] intel_bios_for_each_encoder+0x36/0x60 [xe]
[<ffffffffa06d7bd6>] intel_setup_outputs+0x206/0x450 [xe]
[<ffffffffa06dad33>] intel_display_driver_probe_nogem+0x163/0x1f0 [xe]
[<ffffffffa0680fc7>] xe_display_init_noaccel+0x27/0x70 [xe]
[<ffffffffa05b30d6>] xe_device_probe+0x806/0x9a0 [xe]
[<ffffffffa0612f0f>] xe_pci_probe+0x31f/0x590 [xe]
[<ffffffff81b41718>] local_pci_probe+0x48/0xb0
[<ffffffff81b432c8>] pci_device_probe+0xc8/0x280
[<ffffffff81d5dde8>] really_probe+0xf8/0x390
[<ffffffff81d5e11a>] __driver_probe_device+0x8a/0x170
"
v2 (Jani):
-use intel_bios_fini_panel() to pair with intel_bios_init_panel_early()
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241016150154.1466131-1-shuicheng.lin@intel.com
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.