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

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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@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@chromium.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Hugh Dickins 2011-10-17 17:06:40 -07:00 committed by Dave Airlie
parent 1ea6b8f489
commit d68752cf7b
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/drm_fb_helper.c
View file

@ -255,6 +255,13 @@ 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();
}