The patch titled Subject: drm: avoid switching to text console if there is no panic timeout has been added to the -mm tree. Its filename is drm-avoid-switching-to-text-console-if-there-is-no-panic-timeout.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ From: Hugh Dickins <hughd@xxxxxxxxxxxx> Subject: drm: avoid switching to text console if there is no panic timeout 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. [msb@xxxxxxxxxxxx: edited commit message and modified to short-circuit panic_timeout < 0 instead of testing panic_timeout >= 0] Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx> Signed-off-by: Mandeep Singh Baines <msb@xxxxxxxxxxxx> Cc: Dave Airlie <airlied@xxxxxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> Acked-by: Stéphane Marchesin <marcheu@xxxxxxxxxxxx> Cc: Dave Young <hidave.darkstar@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/drm_fb_helper.c | 7 +++++++ 1 file changed, 7 insertions(+) diff -puN drivers/gpu/drm/drm_fb_helper.c~drm-avoid-switching-to-text-console-if-there-is-no-panic-timeout drivers/gpu/drm/drm_fb_helper.c --- a/drivers/gpu/drm/drm_fb_helper.c~drm-avoid-switching-to-text-console-if-there-is-no-panic-timeout +++ a/drivers/gpu/drm/drm_fb_helper.c @@ -256,6 +256,13 @@ bool drm_fb_helper_force_kernel_mode(voi 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(); } _ Subject: Subject: drm: avoid switching to text console if there is no panic timeout Patches currently in -mm which might be from hughd@xxxxxxxxxxxx are drm-avoid-switching-to-text-console-if-there-is-no-panic-timeout.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html