drm/v3d: Disable interrupts before resetting the GPU

In the Linux kernel, the following vulnerability has been resolved:

drm/v3d: Disable interrupts before resetting the GPU

Currently, an interrupt can be triggered during a GPU reset, which can

lead to GPU hangs and NULL pointer dereference in an interrupt context

as shown in the following trace:

[ 314.035040] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000c0

[ 314.043822] Mem abort info:

[ 314.046606] ESR = 0x0000000096000005

[ 314.050347] EC = 0x25: DABT (current EL), IL = 32 bits

[ 314.055651] SET = 0, FnV = 0

[ 314.058695] EA = 0, S1PTW = 0

[ 314.061826] FSC = 0x05: level 1 translation fault

[ 314.066694] Data abort info:

[ 314.069564] ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000

[ 314.075039] CM = 0, WnR = 0, TnD = 0, TagAccess = 0

[ 314.080080] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0

[ 314.085382] user pgtable: 4k pages, 39-bit VAs, pgdp=0000000102728000

[ 314.091814] [00000000000000c0] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000

[ 314.100511] Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP

[ 314.106770] Modules linked in: v3d i2c_brcmstb vc4 snd_soc_hdmi_codec gpu_sched drm_shmem_helper drm_display_helper cec drm_dma_helper drm_kms_helper drm drm_panel_orientation_quirks snd_soc_core snd_compress snd_pcm_dmaengine snd_pcm snd_timer snd backlight

[ 314.129654] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.25+rpt-rpi-v8 #1 Debian 1:6.12.25-1+rpt1

[ 314.139388] Hardware name: Raspberry Pi 4 Model B Rev 1.4 (DT)

[ 314.145211] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)

[ 314.152165] pc : v3d_irq+0xec/0x2e0 [v3d]

[ 314.156187] lr : v3d_irq+0xe0/0x2e0 [v3d]

[ 314.160198] sp : ffffffc080003ea0

[ 314.163502] x29: ffffffc080003ea0 x28: ffffffec1f184980 x27: 021202b000000000

[ 314.170633] x26: ffffffec1f17f630 x25: ffffff8101372000 x24: ffffffec1f17d9f0

[ 314.177764] x23: 000000000000002a x22: 000000000000002a x21: ffffff8103252000

[ 314.184895] x20: 0000000000000001 x19: 00000000deadbeef x18: 0000000000000000

[ 314.192026] x17: ffffff94e51d2000 x16: ffffffec1dac3cb0 x15: c306000000000000

[ 314.199156] x14: 0000000000000000 x13: b2fc982e03cc5168 x12: 0000000000000001

[ 314.206286] x11: ffffff8103f8bcc0 x10: ffffffec1f196868 x9 : ffffffec1dac3874

[ 314.213416] x8 : 0000000000000000 x7 : 0000000000042a3a x6 : ffffff810017a180

[ 314.220547] x5 : ffffffec1ebad400 x4 : ffffffec1ebad320 x3 : 00000000000bebeb

[ 314.227677] x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000

[ 314.234807] Call trace:

[ 314.237243] v3d_irq+0xec/0x2e0 [v3d]

[ 314.240906] __handle_irq_event_percpu+0x58/0x218

[ 314.245609] handle_irq_event+0x54/0xb8

[ 314.249439] handle_fasteoi_irq+0xac/0x240

[ 314.253527] handle_irq_desc+0x48/0x68

[ 314.257269] generic_handle_domain_irq+0x24/0x38

[ 314.261879] gic_handle_irq+0x48/0xd8

[ 314.265533] call_on_irq_stack+0x24/0x58

[ 314.269448] do_interrupt_handler+0x88/0x98

[ 314.273624] el1_interrupt+0x34/0x68

[ 314.277193] el1h_64_irq_handler+0x18/0x28

[ 314.281281] el1h_64_irq+0x64/0x68

[ 314.284673] default_idle_call+0x3c/0x168

[ 314.288675] do_idle+0x1fc/0x230

[ 314.291895] cpu_startup_entry+0x3c/0x50

[ 314.295810] rest_init+0xe4/0xf0

[ 314.299030] start_kernel+0x5e8/0x790

[ 314.302684] __primary_switched+0x80/0x90

[ 314.306691] Code: 940029eb 360ffc13 f9442ea0 52800001 (f9406017)

[ 314.312775] ---[ end trace 0000000000000000 ]---

[ 314.317384] Kernel panic - not syncing: Oops: Fatal exception in interrupt

[ 314.324249] SMP: stopping secondary CPUs

[ 314.328167] Kernel Offset: 0x2b9da00000 from 0xffffffc080000000

[ 314.334076] PHYS_OFFSET: 0x0

[ 314.336946] CPU features: 0x08,00002013,c0200000,0200421b

[ 314.342337] Memory Limit: none

[ 314.345382] ---[ end Kernel panic - not syncing: Oops: Fatal exception in interrupt ]---

Before resetting the G

---truncated---