drm/bridge: samsung-dsim: fix TE GPIO lifetime for host attach

Overview

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

drm/bridge: samsung-dsim: fix TE GPIO lifetime for host attach

When the Exynos DSI driver was generalized into samsung-dsim, the TE GPIO acquisition was switched from gpiod_get_optional() to devm_gpiod_get_optional() while keeping the matching gpiod_put() calls. That combination is wrong for a managed descriptor.

However, dropping the puts and keeping the managed get is also wrong: samsung_dsim_register_te_irq() runs from the DSI host attach callback, and host detach/reattach can happen without destroying the device that owns the managed action. A second attach would then request the GPIO again without having released it.

Switch back to a non-managed gpiod_get_optional() and keep the explicit gpiod_put() on the request_irq() error path and in samsung_dsim_unregister_te_irq().

[Luca: remove unnecessary comment]

Affected

• Linux >= e7447128ca4a250374d6721ee98e3e3cf99551a6 < 77a43e00c57486a5212ef22d4665cafad62a5d4b
• Linux >= e7447128ca4a250374d6721ee98e3e3cf99551a6 < 5759bbef951c39d264ac0f47daa4137d01403aea
• Linux >= e7447128ca4a250374d6721ee98e3e3cf99551a6 < ebffd70e4877bb7554974cf975a27872f2bb225f
• Linux >= e7447128ca4a250374d6721ee98e3e3cf99551a6 < 9b796251c3cca45a33a5c859c6818c58aa982277
• Linux >= e7447128ca4a250374d6721ee98e3e3cf99551a6 < ada667890773e033d2f40dc94176e3beb930b516
• Linux 6.4

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.