drm/amd/display: Fix kernel panic by dal_gpio_open() error

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@vger.kernel.org>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/display/dc/gpio/gpio_base.c b/drivers/gpu/drm/amd/display/dc/gpio/gpio_base.c
index f67c18375bfdb7ae63adce970a42cfebf969a19a..dac427b68fd7b5c97a1e0715ac27759d497aa747 100644 (file)
--- 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;