diff options
| author | Rob Clark <robdclark@chromium.org> | 2021-10-23 18:00:13 +0200 |
|---|---|---|
| committer | Rob Clark <robdclark@chromium.org> | 2021-10-23 18:11:54 +0200 |
| commit | 00326bfa4e6363e4b0b8b019ecd2556fdda5ad1c (patch) | |
| tree | 7e5459bcc041f93c647bd6599b1cf8606c560df9 /drivers/gpu/drm/msm/disp | |
| parent | drm/msm/dpu: Remove impossible NULL check (diff) | |
| download | linux-00326bfa4e6363e4b0b8b019ecd2556fdda5ad1c.tar.xz linux-00326bfa4e6363e4b0b8b019ecd2556fdda5ad1c.zip | |
drm/msm/dpu: Remove dynamic allocation from atomic context
We know the upper bound on # of mixers (ie. two), so lets just allocate
this on the stack.
Fixes:
BUG: sleeping function called from invalid context at include/linux/sched/mm.h:201
in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 0, name: swapper/0
INFO: lockdep is turned off.
irq event stamp: 43642
hardirqs last enabled at (43641): [<ffffffe24dd276bc>] cpuidle_enter_state+0x158/0x25c
hardirqs last disabled at (43642): [<ffffffe24dfff450>] enter_el1_irq_or_nmi+0x10/0x1c
softirqs last enabled at (43620): [<ffffffe24d4103fc>] __do_softirq+0x1e4/0x464
softirqs last disabled at (43615): [<ffffffe24d48bd90>] __irq_exit_rcu+0x104/0x150
CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.15.0-rc3-debug+ #105
Hardware name: Google Lazor (rev1 - 2) with LTE (DT)
Call trace:
dump_backtrace+0x0/0x18c
show_stack+0x24/0x30
dump_stack_lvl+0xa0/0xd4
dump_stack+0x18/0x34
___might_sleep+0x1e0/0x1f0
__might_sleep+0x78/0x8c
slab_pre_alloc_hook.constprop.0+0x48/0x6c
__kmalloc+0xc8/0x21c
dpu_crtc_vblank_callback+0x158/0x1f8
dpu_encoder_vblank_callback+0x70/0xc4
dpu_encoder_phys_vid_vblank_irq+0x50/0x12c
dpu_core_irq+0x1bc/0x1d0
dpu_irq+0x1c/0x28
msm_irq+0x34/0x40
__handle_irq_event_percpu+0x15c/0x308
handle_irq_event_percpu+0x3c/0x90
handle_irq_event+0x54/0x98
handle_level_irq+0xa0/0xd0
handle_irq_desc+0x2c/0x44
generic_handle_domain_irq+0x28/0x34
dpu_mdss_irq+0x90/0xe8
handle_irq_desc+0x2c/0x44
handle_domain_irq+0x54/0x80
gic_handle_irq+0xd4/0x148
call_on_irq_stack+0x2c/0x54
do_interrupt_handler+0x4c/0x64
el1_interrupt+0x30/0xd0
el1h_64_irq_handler+0x18/0x24
el1h_64_irq+0x78/0x7c
arch_local_irq_enable+0xc/0x14
cpuidle_enter+0x44/0x5c
do_idle+0x248/0x268
cpu_startup_entry+0x30/0x48
rest_init+0x188/0x19c
arch_call_rest_init+0x1c/0x28
start_kernel+0x704/0x744
__primary_switched+0xc0/0xc8
Fixes: 78d9b458cc21 ("drm/msm/dpu: Add CRC support for DPU")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20211023160016.3322052-2-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>
Diffstat (limited to 'drivers/gpu/drm/msm/disp')
| -rw-r--r-- | drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c index 0ae397044310..2523e829f485 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c @@ -182,21 +182,19 @@ static int dpu_crtc_get_crc(struct drm_crtc *crtc) { struct dpu_crtc_state *crtc_state; struct dpu_crtc_mixer *m; - u32 *crcs; + u32 crcs[CRTC_DUAL_MIXERS]; int i = 0; int rc = 0; crtc_state = to_dpu_crtc_state(crtc->state); - crcs = kcalloc(crtc_state->num_mixers, sizeof(*crcs), GFP_KERNEL); - if (!crcs) - return -ENOMEM; + BUILD_BUG_ON(ARRAY_SIZE(crcs) != ARRAY_SIZE(crtc_state->mixers)); /* Skip first 2 frames in case of "uncooked" CRCs */ if (crtc_state->crc_frame_skip_count < 2) { crtc_state->crc_frame_skip_count++; - goto cleanup; + return 0; } for (i = 0; i < crtc_state->num_mixers; ++i) { @@ -210,16 +208,12 @@ static int dpu_crtc_get_crc(struct drm_crtc *crtc) if (rc) { DRM_DEBUG_DRIVER("MISR read failed\n"); - goto cleanup; + return rc; } } - rc = drm_crtc_add_crc_entry(crtc, true, + return drm_crtc_add_crc_entry(crtc, true, drm_crtc_accurate_vblank_count(crtc), crcs); - -cleanup: - kfree(crcs); - return rc; } static bool dpu_crtc_get_scanout_position(struct drm_crtc *crtc, |