linux-kernel - [PATCH 5.4 186/214] drm/amd/display: Fix kernel panic by dal_gpio

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Message-Id: <20201103203308.136848156@linuxfoundation.org>
Date:   Tue,  3 Nov 2020 21:37:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alex Deucher <alexander.deucher@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 5.4 186/214] drm/amd/display: Fix kernel panic by dal_gpio_open() error

From: Takashi Iwai <tiwai@...e.de>

commit 920bb38c518408fa2600eaefa0af9e82cf48f166 upstream.

Currently both error code paths handled in dal_gpio_open_ex() issues
ASSERT_CRITICAL(), and this leads to a kernel panic unnecessarily if
CONFIG_KGDB is enabled.  Since basically both are non-critical errors
and can be recovered, drop those assert calls and use a safer one,
BREAK_TO_DEBUGGER(), for allowing the debugging, instead.

BugLink: https://bugzilla.opensuse.org/show_bug.cgi?id=1177973
Cc: <stable@...r.kernel.org>
Acked-by: Alex Deucher <alexander.deucher@....com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/display/dc/gpio/gpio_base.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/gpio/gpio_base.c
+++ b/drivers/gpu/drm/amd/display/dc/gpio/gpio_base.c
@@ -63,13 +63,13 @@ enum gpio_result dal_gpio_open_ex(
 	enum gpio_mode mode)
 {
 	if (gpio->pin) {
-		ASSERT_CRITICAL(false);
+		BREAK_TO_DEBUGGER();
 		return GPIO_RESULT_ALREADY_OPENED;
 	}
 
 	// No action if allocation failed during gpio construct
 	if (!gpio->hw_container.ddc) {
-		ASSERT_CRITICAL(false);
+		BREAK_TO_DEBUGGER();
 		return GPIO_RESULT_NON_SPECIFIC_ERROR;
 	}
 	gpio->mode = mode;