linux-kernel - [PATCH 0/2] Fix possible deadlocks for i8255 GPIO drivers

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Message-Id: <cover.1680543810.git.william.gray@linaro.org>
Date:   Mon,  3 Apr 2023 13:53:12 -0400
From:   William Breathitt Gray <william.gray@...aro.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        William Breathitt Gray <william.gray@...aro.org>
Subject: [PATCH 0/2] Fix possible deadlocks for i8255 GPIO drivers

The 104-dio-48e and 104-idi-48 drivers leverage regmap-irq to handle
IRQ. The default regmap locking utilizes spinlocks but this can result
in deadlocks for IRQ chips when running -rt kernels [0]. Enable
use_raw_spinlock for the regmap_config of these drivers to prevent such.

[0] https://lore.kernel.org/all/1466065537-82027-1-git-send-email-mika.westerberg@linux.intel.com/

William Breathitt Gray (2):
  gpio: 104-dio-48e: Enable use_raw_spinlock for dio48e_regmap_config
  gpio: 104-idi-48: Enable use_raw_spinlock for idi48_regmap_config

 drivers/gpio/gpio-104-dio-48e.c | 1 +
 drivers/gpio/gpio-104-idi-48.c  | 1 +
 2 files changed, 2 insertions(+)


base-commit: d49765b5f4320a402fbc4ed5edfd73d87640f27c
-- 
2.39.2