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kernel_samsung_a53x/drivers/gpu/drm/nouveau
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Abhinav Singh 4469e03fa9 drm/nouveau/fence:: fix warning directly dereferencing a rcu pointer 
[ Upstream commit 5f35a624c1e30b5bae5023b3c256e94e0ad4f806 ]

Fix a sparse warning with this message
"warning:dereference of noderef expression". In this context it means we
are dereferencing a __rcu tagged pointer directly.

We should not be directly dereferencing a rcu pointer. To get a normal
(non __rcu tagged pointer) from a __rcu tagged pointer we are using the
function unrcu_pointer(...). The non __rcu tagged pointer then can be
dereferenced just like a normal pointer.

I tested with qemu with this command
qemu-system-x86_64 \
	-m 2G \
	-smp 2 \
	-kernel bzImage \
	-append "console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \
	-drive file=bullseye.img,format=raw \
	-net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 \
	-net nic,model=e1000 \
	-enable-kvm \
	-nographic \
	-pidfile vm.pid \
	2>&1 | tee vm.log
with lockdep enabled.

Fixes: 0ec5f02f0e2c ("drm/nouveau: prevent stale fence->channel pointers, and protect with rcu")
Signed-off-by: Abhinav Singh <singhabhinav9051571833@gmail.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231113191303.3277733-1-singhabhinav9051571833@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-11-18 12:12:39 +01:00
..
dispnv04 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dispnv50 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
include Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nvif Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nvkm nouveau/tu102: flush all pdbs on vmm flush 2024-11-18 12:12:13 +01:00
Kbuild Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_abi16.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_abi16.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_acpi.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_acpi.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_backlight.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bios.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bios.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bo.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bo.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bo0039.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bo74c1.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bo85b5.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bo90b5.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bo5039.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_bo9039.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_boa0b5.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_chan.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_chan.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_connector.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_connector.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_crtc.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_debugfs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_debugfs.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_display.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_display.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_dma.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_dma.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_dmem.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_dmem.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_dp.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_drm.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_drv.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_encoder.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_fbcon.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_fbcon.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_fence.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_fence.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_gem.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_gem.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_hwmon.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_hwmon.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_ioc32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_ioctl.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_led.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_led.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_mem.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_mem.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_nvif.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_platform.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_platform.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_prime.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_reg.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_sgdma.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_svm.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_svm.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_ttm.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_ttm.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_usif.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_usif.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_vga.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_vga.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_vmm.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nouveau_vmm.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nv04_fbcon.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nv04_fence.c drm/nouveau/fence:: fix warning directly dereferencing a rcu pointer 2024-11-18 12:12:39 +01:00
nv10_fence.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nv10_fence.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nv17_fence.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nv50_display.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nv50_fbcon.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nv50_fence.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nv84_fence.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nvc0_fbcon.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nvc0_fence.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00