pinctrl: fix deadlock in create_pinctrl() when handling -EPROBE_DEFER

mainline inclusion
from mainline-v6.10-rc6
commit adec57ff8e66aee632f3dd1f93787c13d112b7a1
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAGEP4
CVE: CVE-2024-42090

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=adec57ff8e66aee632f3dd1f93787c13d112b7a1



---------------------------

In create_pinctrl(), pinctrl_maps_mutex is acquired before calling
add_setting(). If add_setting() returns -EPROBE_DEFER, create_pinctrl()
calls pinctrl_free(). However, pinctrl_free() attempts to acquire
pinctrl_maps_mutex, which is already held by create_pinctrl(), leading to
a potential deadlock.

This patch resolves the issue by releasing pinctrl_maps_mutex before
calling pinctrl_free(), preventing the deadlock.

This bug was discovered and resolved using Coverity Static Analysis
Security Testing (SAST) by Synopsys, Inc.

Fixes: 42fed7ba ("pinctrl: move subsystem mutex to pinctrl_dev struct")
Suggested-by: Maximilian Heyne <mheyne@amazon.de>
Signed-off-by: Hagar Hemdan <hagarhem@amazon.com>
Link: https://lore.kernel.org/r/20240604085838.3344-1-hagarhem@amazon.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>