[PATCH] drm: avoid switching to text console if there is no panic timeout

Mandeep Singh Baines msb at chromium.org
Mon Oct 17 17:06:40 PDT 2011

From: Hugh Dickins <hughd at chromium.org>

Add a check for panic_timeout in the drm_fb_helper_panic() notifier: if
we're going to reboot immediately, the user will not be able to see the
messages anyway, and messing with the video mode may display artifacts,
and certainly get into several layers of complexity (including mutexes and
memory allocations) which we shall be much safer to avoid.

Signed-off-by: Hugh Dickins <hughd at google.com>
[ Edited commit message and modified to short-circuit panic_timeout < 0
  instead of testing panic_timeout >= 0.  -Mandeep ]
Signed-off-by: Mandeep Singh Baines <msb at chromium.org>
Cc: Dave Airlie <airlied at redhat.com>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: dri-devel at lists.freedesktop.org
 drivers/gpu/drm/drm_fb_helper.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index f7c6854..0e62c93 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -254,6 +254,13 @@ bool drm_fb_helper_force_kernel_mode(void)
 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 			void *panic_str)
+	/*
+	 * It's a waste of time and effort to switch back to text console
+	 * if the kernel should reboot before panic messages can be seen.
+	 */
+	if (panic_timeout < 0)
+		return 0;
 	printk(KERN_ERR "panic occurred, switching back to text console\n");
 	return drm_fb_helper_force_kernel_mode();

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