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linux/drivers/gpu/drm/rockchip
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Mark yao 8415ab565d drm/rockchip: fix race with kms hotplug and fbdev 
According to the kerneldoc[0], should do fbdev setup before calling
drm_kms_helper_poll_init(), otherwise, Kms hotplug event may race
into fbdev helper initial, and fb_helper->dev may be NULL pointer,
that would cause the bug:
[    0.735411] [00000200] *pgd=00000000f6ffe003, *pud=00000000f6ffe003, *pmd=0000000000000000
[    0.736156] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[    0.736648] Modules linked in:
[    0.736930] CPU: 2 PID: 20 Comm: kworker/2:0 Not tainted 4.4.41 #20
[    0.737480] Hardware name: Rockchip RK3399 Board rev2 (BOX) (DT)
[    0.738020] Workqueue: events cdn_dp_pd_event_work
[    0.738447] task: ffffffc0f21f3100 ti: ffffffc0f2218000 task.ti: ffffffc0f2218000
[    0.739109] PC is at mutex_lock+0x14/0x44
[    0.739469] LR is at drm_fb_helper_hotplug_event+0x30/0x114
[    0.756253] [<ffffff8008a344f4>] mutex_lock+0x14/0x44
[    0.756260] [<ffffff8008445708>] drm_fb_helper_hotplug_event+0x30/0x114
[    0.756271] [<ffffff8008473c84>] rockchip_drm_output_poll_changed+0x18/0x20
[    0.756280] [<ffffff8008439fcc>] drm_kms_helper_hotplug_event+0x28/0x34
[    0.756286] [<ffffff800846c444>] cdn_dp_pd_event_work+0x394/0x3c4
[    0.756295] [<ffffff80080b2b38>] process_one_work+0x218/0x3e0
[    0.756302] [<ffffff80080b3538>] worker_thread+0x2e8/0x404
[    0.756308] [<ffffff80080b7e70>] kthread+0xe8/0xf0
[    0.756316] [<ffffff8008082690>] ret_from_fork+0x10/0x40

[0]: https://01.org/linuxgraphics/gfx-docs/drm/gpu/drm-kms-helpers.html

Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
Reviewed-by: Sandy huang <sandy.huang@rock-chips.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1501575103-20136-1-git-send-email-mark.yao@rock-chips.com
2017-08-04 16:09:46 +08:00
..
analogix_dp-rockchip.c Linux 4.12-rc5 2017-06-16 13:58:27 +10:00
cdn-dp-core.c drm/rockchip: fix NULL check on devm_kzalloc() return value 2017-07-10 14:13:00 -04:00
cdn-dp-core.h drm/rockchip: cdn-dp: retry to check sink count 2017-02-05 16:30:04 +08:00
cdn-dp-reg.c drm/rockchip: cdn-dp: add more log for video config 2017-03-13 15:59:35 -04:00
cdn-dp-reg.h drm/rockchip: cdn-dp: Correct PHY register address 2017-03-13 15:59:26 -04:00
dw_hdmi-rockchip.c drm/rockchip: dw_hdmi: introduce the pclk for grf 2017-06-23 08:52:03 +08:00
dw-mipi-dsi.c drm/rockchip/dsi: correct the grf_switch_reg name 2017-03-24 14:48:58 -04:00
inno_hdmi.c drm: handle HDMI 2.0 VICs in AVI info-frames 2017-07-14 21:23:54 +03:00
inno_hdmi.h drm/rockchip: hdmi: add Innosilicon HDMI support 2016-02-18 13:56:43 +08:00
Kconfig drm/rockchip: Refactor the component match logic. 2017-03-24 14:48:58 -04:00
Makefile drm/rockchip: Refactor the component match logic. 2017-03-24 14:48:58 -04:00
rockchip_drm_drv.c drm/rockchip: fix race with kms hotplug and fbdev 2017-08-04 16:09:46 +08:00
rockchip_drm_drv.h Merge remote-tracking branch 'airlied/drm-next' into drm-misc-next-fixes 2017-06-20 11:50:41 -04:00
rockchip_drm_fb.c drm/atomic: implement drm_atomic_helper_commit_tail for runtime_pm users 2017-07-26 13:45:08 +02:00
rockchip_drm_fb.h drm: Pass the user drm_mode_fb_cmd2 as const to .fb_create() 2015-11-24 11:47:38 +01:00
rockchip_drm_fbdev.c drm/fb-helper: Automatically clean up fb_info 2017-02-07 21:36:28 +01:00
rockchip_drm_fbdev.h drm/rockchip: respect CONFIG_DRM_FBDEV_EMULATION 2016-01-22 08:45:31 +08:00
rockchip_drm_gem.c drm/rockchip: Use .dumb_map_offset and .dumb_destroy defaults 2017-07-29 14:00:35 +02:00
rockchip_drm_gem.h drm/rockchip: Use .dumb_map_offset and .dumb_destroy defaults 2017-07-29 14:00:35 +02:00
rockchip_drm_psr.c drm/rockchip: Fix up bug in psr state machine 2016-09-21 06:55:49 -07:00
rockchip_drm_psr.h drm/rockchip: Don't key off vblank for psr 2016-09-21 06:55:47 -07:00
rockchip_drm_vop.c drm/rockchip: vop: report error when check resource error 2017-08-04 16:09:44 +08:00
rockchip_drm_vop.h drm/rockchip: vop: fix NV12 video display error 2017-08-04 16:09:39 +08:00
rockchip_vop_reg.c drm/rockchip: vop: rk3328: fix overlay abnormal 2017-07-31 08:44:18 +08:00
rockchip_vop_reg.h drm/rockchip: vop: add a series of vop support 2017-07-31 08:44:06 +08:00