CVE-2026-68280: drm/bridge: cdns-dsi: Replace deprecated UNIVERSAL_DEV_PM_OPS()

From: Greg Kroah-Hartman <[email protected]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

drm/bridge: cdns-dsi: Replace deprecated UNIVERSAL_DEV_PM_OPS()

The deprecated UNIVERSAL_DEV_PM_OPS() macro uses the provided callbacks
for both runtime PM and system sleep. This causes the DSI clocks to be
disabled twice: once during runtime suspend and again during system
suspend, resulting in a WARN message from the clock framework when
attempting to disable already-disabled clocks.

[   84.384540] clk:231:5 already disabled
[   84.388314] WARNING: CPU: 2 PID: 531 at /drivers/clk/clk.c:1181 clk_core_disable+0xa4/0xac
...
[   84.579183] Call trace:
[   84.581624]  clk_core_disable+0xa4/0xac
[   84.585457]  clk_disable+0x30/0x4c
[   84.588857]  cdns_dsi_suspend+0x20/0x58 [cdns_dsi]
[   84.593651]  pm_generic_suspend+0x2c/0x44
[   84.597661]  ti_sci_pd_suspend+0xbc/0x15c
[   84.601670]  dpm_run_callback+0x8c/0x14c
[   84.605588]  __device_suspend+0x1a0/0x56c
[   84.609594]  dpm_suspend+0x17c/0x21c
[   84.613165]  dpm_suspend_start+0xa0/0xa8
[   84.617083]  suspend_devices_and_enter+0x12c/0x634
[   84.621872]  pm_suspend+0x1fc/0x368

To address this issue, replace UNIVERSAL_DEV_PM_OPS() with
RUNTIME_PM_OPS(). Bridge and panel drivers should only deal with runtime
PM, as the DRM framework manages system-wide power transitions through
the bridge enable() and disable() hooks.

The Linux kernel CVE team has assigned CVE-2026-68280 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 4.18 with commit e19233955d9e9a9ae202723b9a38ef38e755b5c0 and fixed in 6.6.148 with commit c18d46d9830c29677be5213a067daafe1ac80e43
	Issue introduced in 4.18 with commit e19233955d9e9a9ae202723b9a38ef38e755b5c0 and fixed in 6.12.101 with commit 347bc3a6a4d968c403d2292e5ad986294d919dfc
	Issue introduced in 4.18 with commit e19233955d9e9a9ae202723b9a38ef38e755b5c0 and fixed in 6.18.42 with commit c0384d6872f4dc2701960048a0be1a12a8d2dc6e
	Issue introduced in 4.18 with commit e19233955d9e9a9ae202723b9a38ef38e755b5c0 and fixed in 7.1.6 with commit 1f9c6b74e79639179e90ad0c0fbeae26e31e044b
	Issue introduced in 4.18 with commit e19233955d9e9a9ae202723b9a38ef38e755b5c0 and fixed in 7.2-rc1 with commit 2d8b08844c0ecc6f2002fa68711e779aa18c8585

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-68280
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/c18d46d9830c29677be5213a067daafe1ac80e43
	https://git.kernel.org/stable/c/347bc3a6a4d968c403d2292e5ad986294d919dfc
	https://git.kernel.org/stable/c/c0384d6872f4dc2701960048a0be1a12a8d2dc6e
	https://git.kernel.org/stable/c/1f9c6b74e79639179e90ad0c0fbeae26e31e044b
	https://git.kernel.org/stable/c/2d8b08844c0ecc6f2002fa68711e779aa18c8585