Rui Wang 9aa609e1a3 drm: fb helper should avoid sleeping in panic context ... There are still some places in the fb helper that need to avoid sleeping in panic context. Here's an example: [ 65.615496] bad: scheduling from the idle thread! [ 65.620747] CPU: 92 PID: 0 Comm: swapper/92 Tainted: G M E 3.18.0-rc4-7-default+ #20 [ 65.630364] Hardware name: Intel Corporation BRICKLAND/BRICKLAND, BIOS BRHSXSD1.86B.0056.R01.1409242327 09/24/2014 [ 65.641923] ffff88087f693d80 ffff88087f689878 ffffffff81566db9 0000000000000000 [ 65.650226] ffff88087f693d80 ffff88087f689898 ffffffff810871ff ffff88046eb3e0d0 [ 65.658527] ffff88087f693d80 ffff88087f6898c8 ffffffff8107c1fa 000000017f6898b8 [ 65.666830] Call Trace: [ 65.669557] <#MC> [<ffffffff81566db9>] dump_stack+0x46/0x58 [ 65.675994] [<ffffffff810871ff>] dequeue_task_idle+0x2f/0x40 [ 65.682412] [<ffffffff8107c1fa>] dequeue_task+0x5a/0x80 [ 65.688345] [<ffffffff810804f3>] deactivate_task+0x23/0x30 [ 65.694569] [<ffffffff81569050>] __schedule+0x580/0x7f0 [ 65.700502] [<ffffffff81569739>] schedule_preempt_disabled+0x29/0x70 [ 65.707696] [<ffffffff8156abb6>] __ww_mutex_lock_slowpath+0xb8/0x162 [ 65.714891] [<ffffffff8156acb3>] __ww_mutex_lock+0x53/0x85 [ 65.721125] [<ffffffffa00b3a5d>] drm_modeset_lock+0x3d/0x110 [drm] [ 65.728132] [<ffffffffa00b3c2a>] __drm_modeset_lock_all+0x8a/0x120 [drm] [ 65.735721] [<ffffffffa00b3cd0>] drm_modeset_lock_all+0x10/0x30 [drm] [ 65.743015] [<ffffffffa01af8bf>] drm_fb_helper_pan_display+0x2f/0xf0 [drm_kms_helper] [ 65.751857] [<ffffffff8132bd21>] fb_pan_display+0xd1/0x1a0 [ 65.758081] [<ffffffff81326010>] bit_update_start+0x20/0x50 [ 65.764400] [<ffffffff813259f2>] fbcon_switch+0x3a2/0x550 [ 65.770528] [<ffffffff813a01c9>] redraw_screen+0x189/0x240 [ 65.776750] [<ffffffff81322f8a>] fbcon_blank+0x20a/0x2d0 [ 65.782778] [<ffffffff8137d359>] ? erst_writer+0x209/0x330 [ 65.789002] [<ffffffff810ba2f3>] ? internal_add_timer+0x63/0x80 [ 65.795710] [<ffffffff810bc137>] ? mod_timer+0x127/0x1e0 [ 65.801740] [<ffffffff813a0cd8>] do_unblank_screen+0xa8/0x1d0 [ 65.808255] [<ffffffff813a0e10>] unblank_screen+0x10/0x20 [ 65.814381] [<ffffffff812ca0d9>] bust_spinlocks+0x19/0x40 [ 65.820508] [<ffffffff81561ca7>] panic+0x106/0x1f5 [ 65.825955] [<ffffffff8102336c>] mce_panic+0x2ac/0x2e0 [ 65.831789] [<ffffffff812c796a>] ? delay_tsc+0x4a/0x80 [ 65.837625] [<ffffffff81024e1f>] do_machine_check+0xbaf/0xbf0 [ 65.844138] [<ffffffff813365d7>] ? intel_idle+0xc7/0x150 [ 65.850166] [<ffffffff8156f03f>] machine_check+0x1f/0x30 [ 65.856195] [<ffffffff813365d7>] ? intel_idle+0xc7/0x150 [ 65.862222] <<EOE>> [<ffffffff814283d5>] cpuidle_enter_state+0x55/0x170 [ 65.869823] [<ffffffff814285a7>] cpuidle_enter+0x17/0x20 [ 65.875852] [<ffffffff81097b08>] cpu_startup_entry+0x2d8/0x370 [ 65.882467] [<ffffffff8102fe29>] start_secondary+0x159/0x180 There's __drm_modeset_lock_all() which Daniel Vetter introduced for this purpose. We can leverage that without reinventing anything. This patch works with the latest kernel. Reviewed-by: Rob Clark <robdclark@gmail.com> Tested-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Rui Wang <rui.y.wang@intel.com> Signed-off-by: Dave Airlie <airlied@redhat.com>		2015-01-21 09:26:15 +10:00
..
accessibility
acpi	Merge branch 'for-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2015-01-14 07:53:51 +13:00
amba	Char/Misc driver patches for 3.19-rc1	2014-12-14 16:43:47 -08:00
android
ata	More ACPI and power management updates for 3.19-rc1	2014-12-18 20:28:33 -08:00
atm	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
auxdisplay
base	Merge branches 'pm-domains', 'powercap' and 'pm-tools'	2014-12-29 21:24:00 +01:00
bcma	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2014-12-11 17:56:37 -08:00
block	NVMe: Fix locking on abort handling	2015-01-08 09:02:23 -07:00
bluetooth	Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next	2014-12-15 13:23:09 -05:00
bus	drivers: bus: check cci device tree node status	2015-01-16 19:10:41 -08:00
cdrom
char	ipmi: Fix compile warning with tv_usec	2014-12-30 13:34:36 -06:00
clk	clk: fix possible null pointer dereference	2015-01-17 11:33:57 -08:00
clocksource	Fixes for 3.19	2014-12-30 15:27:20 +01:00
connector
coresight
cpufreq	Merge branches 'pm-cpufreq' and 'pm-cpuidle'	2014-12-29 21:23:41 +01:00
cpuidle	Merge branches 'pm-cpufreq' and 'pm-cpuidle'	2014-12-29 21:23:41 +01:00
crypto	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
dca
devfreq
dio
dma	dmaengine: dw: balance PM runtime calls	2015-01-13 23:07:58 +05:30
dma-buf
edac	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
eisa
extcon	Char/Misc driver patches for 3.19-rc1	2014-12-14 16:43:47 -08:00
firewire	firewire: sbp2: replace card lock by target lock	2014-12-10 20:53:21 +01:00
firmware	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
fmc
gpio	gpio: dln2: use bus_sync_unlock instead of scheduling work	2015-01-09 07:57:35 +01:00
gpu	drm: fb helper should avoid sleeping in panic context	2015-01-21 09:26:15 +10:00
hid	HID: roccat: potential out of bounds in pyra_sysfs_write_settings()	2015-01-09 14:41:01 +01:00
hsi	* misc. fixes in omap-ssi and nokia-modem drivers	2014-12-15 17:33:47 -08:00
hv	Char/Misc driver patches for 3.19-rc1	2014-12-14 16:43:47 -08:00
hwmon	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2014-12-17 10:16:27 -08:00
hwspinlock
i2c	Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2014-12-20 13:52:52 -08:00
ide	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
idle
iio	First round of IIO fixes for the 3.19 cycle.	2015-01-08 17:59:04 -08:00
infiniband	SCSI for-linus on 20141220	2014-12-20 13:42:57 -08:00
input	Revert "Input: atmel_mxt_ts - use deep sleep mode when stopped"	2014-12-31 12:59:34 -08:00
iommu	iommu/rockchip: Drop owner assignment from platform_drivers	2015-01-05 12:40:06 +01:00
ipack
irqchip	Merge branch 'irq-irqdomain-arm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-12-15 17:30:09 -08:00
isdn	isdn: fix NUL (\0 or \x00) specification in string	2015-01-12 15:31:35 -05:00
leds	leds: netxbig: fix oops at probe time	2015-01-13 13:49:01 -08:00
lguest	virtio: allow finalize_features to fail	2014-12-09 16:32:32 +02:00
macintosh	macintosh: therm_pm72: delete deprecated driver	2014-12-19 19:32:47 +01:00
mailbox	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
mcb	mcb: mcb-pci: Only remap the 1st 0x200 bytes of BAR 0	2015-01-09 15:46:37 -08:00
md	dm: fix missed error code if .end_io isn't implemented by target_type	2014-12-17 12:31:13 -05:00
media	More ACPI and power management updates for 3.19-rc1	2014-12-18 20:28:33 -08:00
memory	MTD updates for 3.19:	2014-12-17 09:59:26 -08:00
memstick
message
mfd	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2014-12-30 16:59:59 -08:00
misc	Char/Misc driver fixes for 3.19-rc5	2015-01-17 08:18:08 +13:00
mmc	mmc: sdhci: Set SDHCI_POWER_ON with external vmmc	2015-01-14 09:47:19 +01:00
mtd	MTD updates for 3.19:	2014-12-17 09:59:26 -08:00
net	tg3: Release tp->lock before invoking synchronize_irq()	2015-01-14 17:05:51 -05:00
nfc	More ACPI and power management updates for 3.19-rc1	2014-12-18 20:28:33 -08:00
ntb
nubus
of	ARM: SoC/iommu configuration for 3.19	2014-12-16 14:53:01 -08:00
oprofile
parisc
parport	Char/Misc driver patches for 3.19-rc1	2014-12-14 16:43:47 -08:00
pci	Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-12-19 14:02:02 -08:00
pcmcia	Char/Misc driver patches for 3.19-rc1	2014-12-14 16:43:47 -08:00
phy	phy: phy-ti-pipe3: fix inconsistent enumeration of PCIe gen2 cards	2014-12-23 15:44:32 +05:30
pinctrl	pinctrl: st: Add irq_disable hook to st_gpio_irqchip	2015-01-07 10:44:39 +01:00
platform	platform-drivers-x86 for 3.19	2014-12-18 20:24:55 -08:00
pnp
power	More ACPI and power management updates for 3.19-rc1	2014-12-18 20:28:33 -08:00
powercap	powercap / RAPL: add IDs for future Xeon CPUs	2014-12-17 02:35:42 +01:00
pps
ps3
ptp
pwm	pwm: Changes for v3.19-rc1	2014-12-17 10:10:51 -08:00
rapidio
ras
regulator	regulator: Fix for v3.19	2014-12-29 13:24:38 -08:00
remoteproc	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
reset	reset: sunxi: fix spinlock initialization	2015-01-16 19:11:31 -08:00
rpmsg
rtc	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
s390	s390/zcrypt: kernel oops at insmod of the z90crypt device driver	2014-12-18 09:55:55 +01:00
sbus
scsi	scsi: ->queue_rq can't sleep	2015-01-09 15:43:01 +01:00
sfi
sh	drivers: sh / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM	2014-12-05 03:08:24 +01:00
sn
soc	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2014-12-15 15:52:01 -08:00
spi	Merge remote-tracking branches 'spi/fix/img-spfi' and 'spi/fix/msiof' into spi-linus	2014-12-24 12:57:54 +00:00
spmi
ssb	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2014-12-11 17:56:37 -08:00
staging	staging: vt6655: fix sparse warning: argument type	2015-01-12 19:49:47 -08:00
target	iscsi-target: Fix typos in enum cmd_flags_table	2015-01-09 15:25:58 -08:00
tc
thermal	Merge branch 'thermal-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2015-01-15 19:20:26 +13:00
thunderbolt
tty	serial: samsung: Add the support for Exynos5433 SoC	2015-01-09 13:46:02 -08:00
uio	Char/Misc driver patches for 3.19-rc1	2014-12-14 16:43:47 -08:00
usb	usb: fixes for v3.19-rc6	2015-01-14 16:27:23 -08:00
uwb
vfio	vfio-pci: Fix the check on pci device type in vfio_pci_probe()	2015-01-07 10:29:11 -07:00
vhost	Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2015-01-13 15:23:26 +13:00
video	fbdev/broadsheetfb: fix memory leak	2015-01-13 15:13:45 +02:00
virt
virtio	virtio_pci: document why we defer kfree	2015-01-06 16:35:36 +02:00
vlynq
vme
w1	Char/Misc driver patches for 3.19-rc1	2014-12-14 16:43:47 -08:00
watchdog	watchdog: imx2_wdt: Fix the argument of watchdog_active()	2014-12-18 16:01:20 +01:00
xen	Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus	2014-12-18 05:56:29 -08:00
zorro
Kconfig	Staging patches for 3.19-rc1	2014-12-15 18:06:13 -08:00
Makefile	drivers: Move iommu/ before gpu/ in Makefile	2014-12-22 11:47:37 +02:00