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fa0b1ef5f7
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Mark Yacoub fa0b1ef5f7 drm: Copy drm_wait_vblank to user before returning 
[Why]
Userspace should get back a copy of drm_wait_vblank that's been modified
even when drm_wait_vblank_ioctl returns a failure.

Rationale:
drm_wait_vblank_ioctl modifies the request and expects the user to read
it back. When the type is RELATIVE, it modifies it to ABSOLUTE and updates
the sequence to become current_vblank_count + sequence (which was
RELATIVE), but now it became ABSOLUTE.
drmWaitVBlank (in libdrm) expects this to be the case as it modifies
the request to be Absolute so it expects the sequence to would have been
updated.

The change is in compat_drm_wait_vblank, which is called by
drm_compat_ioctl. This change of copying the data back regardless of the
return number makes it en par with drm_ioctl, which always copies the
data before returning.

[How]
Return from the function after everything has been copied to user.

Fixes IGT:kms_flip::modeset-vs-vblank-race-interruptible
Tested on ChromeOS Trogdor(msm)

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: Mark Yacoub <markyacoub@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210812194917.1703356-1-markyacoub@chromium.org
2021-08-17 13:56:03 -04:00
..
accessibility TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
acpi Merge branch 'acpi-utils' 2021-07-23 17:06:15 +02:00
amba
android
ata ARM: SoC changes for 5.14 2021-07-10 09:22:44 -07:00
atm Networking changes for 5.14. 2021-06-30 15:51:09 -07:00
auxdisplay
base driver core: Prevent warning when removing a device link from unregistered consumer 2021-07-21 17:28:42 +02:00
bcma
block rbd: resurrect setting of disk->private_data in rbd_init_disk() 2021-07-21 17:20:43 +02:00
bluetooth TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
bus bus: mhi: pci_generic: Fix inbound IPCR channel 2021-07-21 13:16:18 +02:00
cdrom block: remove REQ_OP_SCSI_{IN,OUT} 2021-06-30 15:34:19 -06:00
char powerpc/powernv: Fix fall-through warning for Clang 2021-07-13 19:21:41 -05:00
clk dt-bindings: clock: r9a07g044-cpg: Update clock/reset definitions 2021-07-12 10:52:03 +02:00
clocksource This round has a diffstat dominated by Qualcomm clk drivers. Honestly though 2021-07-01 13:26:16 -07:00
comedi Staging / IIO driver patches for 5.14-rc1 2021-07-05 14:01:53 -07:00
connector
counter
cpufreq cpufreq: Fix fall-through warning for Clang 2021-07-13 11:53:07 -05:00
cpuidle - Add support for the Qcom MSM8226 (Bartosz Dudziak) 2021-06-30 14:56:51 +02:00
crypto ARM: SoC changes for 5.14 2021-07-10 09:22:44 -07:00
cxl
dax fs: remove noop_set_page_dirty() 2021-06-29 10:53:48 -07:00
dca
devfreq PM / devfreq: passive: Fix get_target_freq when not using required-opp 2021-06-24 10:37:35 +09:00
dio
dma dmaengine: mpc512x: Fix fall-through warning for Clang 2021-07-14 11:05:55 -05:00
dma-buf Short summary of fixes pull: 2021-07-13 15:15:17 +02:00
edac EDAC/igen6: fix core dependency AGAIN 2021-07-15 11:59:59 -07:00
eisa
extcon Char / Misc driver updates for 5.14-rc1 2021-07-05 13:42:16 -07:00
firewire Char / Misc driver updates for 5.14-rc1 2021-07-05 13:42:16 -07:00
firmware A set of EFI fixes: 2021-07-25 10:04:27 -07:00
fpga fpga: machxo2-spi: Address warning about unused variable 2021-06-24 15:45:11 +02:00
fsi
gnss
gpio - Core Frameworks 2021-07-05 12:10:34 -07:00
gpu drm: Copy drm_wait_vblank to user before returning 2021-08-17 13:56:03 -04:00
greybus
hid Merge branch 'for-5.14/multitouch' into for-linus 2021-06-30 09:15:15 +02:00
hsi
hv Drivers: hv: vmbus: Fix duplicate CPU assignments within a device 2021-07-19 09:26:31 +00:00
hwmon Char / Misc driver updates for 5.14-rc1 2021-07-05 13:42:16 -07:00
hwspinlock
hwtracing Char / Misc driver updates for 5.14-rc1 2021-07-05 13:42:16 -07:00
i2c i2c: mpc: Poll for MCF 2021-07-20 22:32:01 +02:00
i3c I3C for 5.14 2021-07-10 11:53:06 -07:00
idle
iio Staging / IIO driver patches for 5.14-rc1 2021-07-05 14:01:53 -07:00
infiniband Tracing updates for 5.14: 2021-07-03 11:13:22 -07:00
input This pull request contains the following changes for UML: 2021-07-09 10:19:13 -07:00
interconnect interconnect changes for 5.14 2021-06-22 22:03:25 +02:00
iommu fallthrough fixes for Clang for 5.14-rc2 2021-07-15 13:57:31 -07:00
ipack TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
irqchip irqchip fixes for 5.14, take #1 2021-07-09 15:35:13 +02:00
isdn TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
leds This contains quite a lot of fixes, with more fixes in my inbox that 2021-07-03 11:57:42 -07:00
lightnvm
macintosh
mailbox mbox: add polarfire soc system controller mailbox 2021-06-26 12:06:48 -05:00
mcb mcb: Use DEFINE_RES_MEM() helper macro and fix the end address 2021-06-24 15:56:25 +02:00
md - Various DM persistent-data library improvements and fixes that 2021-06-30 18:19:39 -07:00
media ACPI fixes for 5.14-rc3 2021-07-23 11:08:06 -07:00
memory
memstick for-5.14/block-2021-06-29 2021-06-30 12:12:56 -07:00
message scsi: message: mptfc: Switch from pci_ to dma_ API 2021-06-22 23:00:01 -04:00
mfd Driver core changes for 5.14-rc1 2021-07-05 13:51:41 -07:00
misc Merge tag 'at24-fixes-for-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into i2c/for-current 2021-07-20 22:28:56 +02:00
mmc MMC core: 2021-07-22 09:51:38 -07:00
most
mtd mtd: cfi_util: Fix unreachable code issue 2021-07-12 11:15:28 -05:00
mux
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-07-22 10:11:27 -07:00
nfc
ntb
nubus
nvdimm cxl for 5.14 2021-07-04 11:55:13 -07:00
nvme block-5.14-2021-07-24 2021-07-24 12:57:06 -07:00
nvmem Char / Misc driver updates for 5.14-rc1 2021-07-05 13:42:16 -07:00
of Devicetree updates for v5.14: 2021-07-03 10:54:08 -07:00
opp
parisc kernel.h: split out panic and oops helpers 2021-07-01 11:06:04 -07:00
parport
pci PCI: Fix fall-through warning for Clang 2021-07-13 13:59:12 -05:00
pcmcia
perf
phy USB / Thunderbolt patches for 5.14-rc1 2021-07-05 14:16:22 -07:00
pinctrl This is the bulk of pin control changes for the v5.14 kernel: 2021-07-01 16:57:14 -07:00
platform Driver core changes for 5.14-rc1 2021-07-05 13:51:41 -07:00
pnp Char / Misc driver updates for 5.14-rc1 2021-07-05 13:42:16 -07:00
power power: supply: Fix fall-through warnings for Clang 2021-07-13 14:50:47 -05:00
powercap
pps
ps3
ptp ptp: Relocate lookup cookie to correct block. 2021-07-08 12:33:10 -07:00
pwm pwm: ep93xx: Ensure configuring period and duty_cycle isn't wrongly skipped 2021-07-08 16:09:30 +02:00
rapidio
ras
regulator regulator: Fixes for v5.14 2021-07-21 12:37:49 -07:00
remoteproc remoteproc updates for v5.14 2021-07-07 10:50:03 -07:00
reset ARM: Drivers for 5.14 2021-07-10 09:46:20 -07:00
rpmsg
rtc RTC for 5.14 2021-07-10 16:19:10 -07:00
s390 SCSI fixes on 20210717 2021-07-17 13:09:23 -07:00
sbus
scsi SCSI fixes on 20210724 2021-07-24 13:08:31 -07:00
sh
siox siox: Simplify error handling via dev_err_probe() 2021-06-24 15:46:34 +02:00
slimbus
soc ARM: Drivers for 5.14 2021-07-10 09:46:20 -07:00
soundwire Char / Misc driver updates for 5.14-rc1 2021-07-05 13:42:16 -07:00
spi spi: Fixes for v5.14 2021-07-21 12:41:41 -07:00
spmi spmi: hisi-spmi-controller: move driver from staging 2021-06-25 10:02:05 +02:00
ssb
staging TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
target scsi: target: Fix NULL dereference on XCOPY completion 2021-07-20 23:18:22 -04:00
tc
tee fallthrough fixes for Clang for 5.14-rc1 2021-06-28 20:03:38 -07:00
thermal - Add rk3568 sensor support (Finley Xiao) 2021-07-10 11:43:25 -07:00
thunderbolt USB / Thunderbolt patches for 5.14-rc1 2021-07-05 14:16:22 -07:00
tty This pull request contains the following changes for UML: 2021-07-09 10:19:13 -07:00
uio
usb USB fixes for 5.14-rc3 2021-07-23 10:09:27 -07:00
vdpa vp_vdpa: allow set vq state to initial state after reset 2021-07-08 07:49:02 -04:00
vfio VFIO update for v5.14-rc1 2021-07-03 11:49:33 -07:00
vhost vdpa: support packed virtqueue for set/get_vq_state() 2021-07-08 07:49:01 -04:00
video drm fixes for 5.14-rc2 2021-07-16 11:14:54 -07:00
virt nitro_enclaves: Set Bus Master for the NE PCI device 2021-06-24 15:48:27 +02:00
virtio virtio,vhost,vdpa: features, fixes 2021-07-09 11:06:29 -07:00
visorbus
vlynq
vme
w1
watchdog linux-watchdog 5.14-rc1 tag 2021-07-07 12:57:46 -07:00
xen xen: branch for v5.14-rc1 2021-07-07 11:07:13 -07:00
zorro
Kconfig
Makefile hyperv-next for 5.14 2021-06-29 11:21:35 -07:00