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Chris Wilson 0e799e840a drm: Restore the NULL check for drm_gem_object_put() 
Some users want to pass NULL to drm_gem_object_put(), but those using
__drm_gem_object_put() did not. Compromise, have both and let the
compiler sort it out.

drm_gem_fb_destroy() calls drm_gem_object_put() with NULL obj causing:
[   11.584209] BUG: kernel NULL pointer dereference, address: 0000000000000000
[   11.584213] #PF: supervisor write access in kernel mode
[   11.584215] #PF: error_code(0x0002) - not-present page
[   11.584216] PGD 0 P4D 0
[   11.584220] Oops: 0002 [#1] SMP NOPTI
[   11.584223] CPU: 7 PID: 1571 Comm: gnome-shell Tainted: G            E     5.7.0-rc1-1-default+ #27
[   11.584225] Hardware name: Micro-Star International Co., Ltd. MS-7A31/X370 XPOWER GAMING TITANIUM (MS-7A31), BIOS 1.MR 12/03/2019
[   11.584237] RIP: 0010:drm_gem_fb_destroy+0x28/0x70 [drm_kms_helper]
<snip>
[   11.584256] Call Trace:
[   11.584279]  drm_mode_rmfb+0x189/0x1c0 [drm]
[   11.584299]  ? drm_mode_rmfb+0x1c0/0x1c0 [drm]
[   11.584314]  drm_ioctl_kernel+0xaa/0xf0 [drm]
[   11.584329]  drm_ioctl+0x1ff/0x3b0 [drm]
[   11.584347]  ? drm_mode_rmfb+0x1c0/0x1c0 [drm]
[   11.584421]  amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
[   11.584427]  ksys_ioctl+0x87/0xc0
[   11.584430]  __x64_sys_ioctl+0x16/0x20
[   11.584434]  do_syscall_64+0x5f/0x240
[   11.584438]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   11.584440] RIP: 0033:0x7f0ef80f7227

Reported-by: Nirmoy Das <nirmoy.das@amd.com>
Fixes: b5d250744ccc ("drm/gem: fold drm_gem_object_put_unlocked and __drm_gem_object_put()")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Nirmoy Das <nirmoy.das@amd.com>
Cc: Emil Velikov <emil.velikov@collabora.com>
Cc: Christian König <christian.koenig@amd.com>.
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200520142347.29060-1-chris@chris-wilson.co.uk
2020-05-20 17:05:07 +01:00
..
accessibility
…
acpi
More ACPI updates for 5.7-rc1
2020-04-10 09:52:15 -07:00
amba
Revert "amba: Initialize dma_parms for amba devices"
2020-04-01 08:03:28 +02:00
android
…
ata
ahci: Add Intel Comet Lake PCH RAID PCI ID
2020-04-09 09:31:38 -06:00
atm
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
auxdisplay
…
base
mm/memory_hotplug: allow to specify a default online_type
2020-04-07 10:43:41 -07:00
bcma
…
block
xen: branch for v5.7-rc1b
2020-04-10 17:20:06 -07:00
bluetooth
…
bus
ARM: driver updates
2020-04-03 15:05:35 -07:00
cdrom
…
char
Merge branch 'akpm' (patches from Andrew)
2020-04-10 17:57:48 -07:00
clk
There's not much to see in the core framework this time around. Instead the
2020-04-05 10:43:32 -07:00
clocksource
clocksource/drivers/timer-vf-pit: Add missing parenthesis
2020-04-05 09:24:58 +02:00
connector
…
counter
…
cpufreq
Additional power management updates for 5.7-rc1
2020-04-06 10:14:39 -07:00
cpuidle
Merge branch 'pm-cpuidle'
2020-04-10 11:32:22 +02:00
crypto
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2020-04-08 21:35:29 -07:00
dax
dax: Move mandatory ->zero_page_range() check in alloc_dax()
2020-04-02 19:15:03 -07:00
dca
…
devfreq
PM / devfreq: Fix handling dev_pm_qos_remove_request result
2020-03-25 08:35:03 +09:00
dio
…
dma
drivers/dma/tegra20-apb-dma.c: fix platform_get_irq.cocci warnings
2020-04-10 15:36:22 -07:00
dma-buf
dma-fence: add might_sleep annotation to _wait()
2020-05-20 13:02:19 +02:00
edac
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-30 16:40:08 -07:00
eisa
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
extcon
Char/Misc driver patches for 5.7-rc1
2020-04-03 13:22:40 -07:00
firewire
…
firmware
sound fixes for 5.7-rc1
2020-04-10 12:27:06 -07:00
fpga
…
fsi
…
gnss
…
gpio
This is the bulk of GPIO development for the v5.7 kernel cycle.
2020-04-04 10:27:00 -07:00
gpu
drm: Restore the NULL check for drm_gem_object_put()
2020-05-20 17:05:07 +01:00
greybus
…
hid
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
2020-04-01 15:18:42 -07:00
hsi
…
hv
hv_balloon: don't check for memhp_auto_online manually
2020-04-07 10:43:40 -07:00
hwmon
change email address for Pali Rohár
2020-04-10 15:36:22 -07:00
hwspinlock
hwspinlock: hwspinlock_internal.h: Replace zero-length array with flexible-array member
2020-03-25 22:30:46 -07:00
hwtracing
intel_th: msu: Make stopping the trace optional
2020-03-24 13:45:24 +01:00
i2c
Merge branch 'i2c/for-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2020-04-02 15:54:13 -07:00
i3c
i3c: convert to use i2c_new_client_device()
2020-03-29 10:35:50 +02:00
ide
drivers/ide: Fix build regression.
2020-04-04 18:07:59 -07:00
idle
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-30 16:40:08 -07:00
iio
chrome platform changes for 5.7
2020-04-08 21:25:49 -07:00
infiniband
RDMA 5.7 pull request
2020-04-01 18:18:18 -07:00
input
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2020-04-07 20:20:12 -07:00
interconnect
…
iommu
Merge branches 'iommu/fixes', 'arm/qcom', 'arm/omap', 'arm/smmu', 'x86/amd', 'x86/vt-d', 'virtio' and 'core' into next
2020-03-27 11:33:27 +01:00
ipack
…
irqchip
Two reverts addressing regressions of the Xilinx interrupt controller
2020-04-05 11:57:12 -07:00
isdn
…
leds
leds: core: Fix warning message when init_data
2020-04-06 23:12:08 +02:00
lightnvm
for-5.7/drivers-2020-03-29
2020-03-30 11:43:51 -07:00
macintosh
Char/Misc driver patches for 5.7-rc1
2020-04-03 13:22:40 -07:00
mailbox
…
mcb
…
md
libnvdimm for 5.7
2020-04-08 21:03:40 -07:00
media
Power management updates for 5.7-rc1
2020-03-30 15:05:01 -07:00
memory
ARM: driver updates
2020-04-03 15:05:35 -07:00
memstick
…
message
scsi: message: fusion: Replace zero-length array with flexible-array member
2020-03-26 22:40:47 -04:00
mfd
mfd: intel-lpss: Fix Intel Elkhart Lake LPSS I2C input clock
2020-03-30 07:35:28 +01:00
misc
virtio: fixes, vdpa
2020-04-08 10:51:53 -07:00
mmc
MMC core:
2020-03-31 16:13:09 -07:00
most
staging: most: move core files out of the staging area
2020-03-24 13:42:44 +01:00
mtd
This pull request contains fixes for UBI and UBIFS:
2020-04-07 12:40:56 -07:00
mux
…
net
virtio: fixes, vdpa
2020-04-08 10:51:53 -07:00
nfc
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-03-25 18:58:11 -07:00
ntb
pci-v5.7-changes
2020-04-03 14:25:02 -07:00
nubus
…
nvdimm
libnvdimm for 5.7
2020-04-08 21:03:40 -07:00
nvme
block-5.7-2020-04-10
2020-04-10 10:06:54 -07:00
nvmem
nvmem: core: remove nvmem_sysfs_get_groups()
2020-03-25 19:23:49 +01:00
of
Devicetree updates for v5.7:
2020-04-02 17:32:52 -07:00
opp
…
oprofile
…
parisc
parisc: Replace setup_irq() by request_irq()
2020-04-05 22:05:23 +02:00
parport
…
pci
IOMMU Updates for Linux v5.7
2020-04-08 11:00:00 -07:00
pcmcia
pcmcia: remove some unused space characters
2020-03-31 18:48:22 +02:00
perf
arm64 updates for 5.7:
2020-03-31 10:05:01 -07:00
phy
pci-v5.7-changes
2020-04-03 14:25:02 -07:00
pinctrl
This is the bulk of GPIO development for the v5.7 kernel cycle.
2020-04-04 10:27:00 -07:00
platform
change email address for Pali Rohár
2020-04-10 15:36:22 -07:00
pnp
…
power
change email address for Pali Rohár
2020-04-10 15:36:22 -07:00
powercap
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-30 16:40:08 -07:00
pps
…
ps3
powerpc/ps3: Remove an unneeded NULL check
2020-04-03 00:09:59 +11:00
ptp
ptp: Avoid deadlocks in the programmable pin code.
2020-03-30 11:16:38 -07:00
pwm
pwm: pca9685: Fix PWM/GPIO inter-operation
2020-04-03 21:41:42 +02:00
rapidio
…
ras
…
regulator
spi/regulator: Updates for v5.7
2020-03-30 14:58:26 -07:00
remoteproc
remoteproc/omap: Fix set_load call in omap_rproc_request_timer
2020-04-03 10:47:21 -07:00
reset
…
rpmsg
…
rtc
- New Drivers
2020-04-07 19:48:52 -07:00
s390
SCSI misc on 20200410
2020-04-10 12:21:11 -07:00
sbus
…
scsi
SCSI misc on 20200410
2020-04-10 12:21:11 -07:00
sfi
…
sh
…
siox
…
slimbus
…
soc
RISC-V Patches for the 5.7 Merge Window, Part 1
2020-04-09 10:51:30 -07:00
soundwire
Char/Misc driver patches for 5.7-rc1
2020-04-03 13:22:40 -07:00
spi
sound updates for 5.7-rc1
2020-04-02 15:50:04 -07:00
spmi
…
ssb
…
staging
mm/vma: introduce VM_ACCESS_FLAGS
2020-04-10 15:36:21 -07:00
target
SCSI misc on 20200410
2020-04-10 12:21:11 -07:00
tc
…
tee
ARM: driver updates
2020-04-03 15:05:35 -07:00
thermal
- Convert tsens configuration DT binding to yaml (Rajeshwari)
2020-04-07 20:00:16 -07:00
thunderbolt
…
tty
powerpc updates for 5.7
2020-04-05 11:12:59 -07:00
uio
…
usb
SCSI misc on 20200402
2020-04-02 17:03:53 -07:00
vdpa
vdpa: move to drivers/vdpa
2020-04-02 10:41:40 -04:00
vfio
vfio: Ignore -ENODEV when getting MSI cookie
2020-04-01 13:51:51 -06:00
vhost
vhost: introduce vDPA-based backend
2020-04-02 10:41:40 -04:00
video
video: amba-clcd: use devm_of_find_backlight
2020-05-18 12:10:02 +02:00
virt
…
virtio
virtio: fixes, vdpa
2020-04-08 10:51:53 -07:00
visorbus
…
vlynq
…
vme
…
w1
…
watchdog
watchdog: Add K3 RTI watchdog support
2020-04-01 11:35:23 +02:00
xen
xen: branch for v5.7-rc1b
2020-04-10 17:20:06 -07:00
zorro
SPDX patches for 5.7-rc1.
2020-04-03 13:12:26 -07:00
Kconfig
virtio: fixes, vdpa
2020-04-08 10:51:53 -07:00
Makefile
virtio: fixes, vdpa
2020-04-08 10:51:53 -07:00