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disp: msm: Fix division by zero during ESD recovery

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During ESD recovery, num_mixers becomes 0 for a few moments.

[   34.758513] ================================================================================
[   34.758519] UBSAN: division-overflow in ../techpack/display/msm/sde/sde_crtc.h:522:32
[   34.758521] division by zero
[   34.758524] CPU: 6 PID: 1039 Comm: SDM_EventThread Tainted: G S                5.4.302~positron/4565e293 #17
[   34.758525] Hardware name: Qualcomm Technologies, Inc. Blair QRD NOPMI (DT)
[   34.758526] Call trace:
[   34.758531] dump_backtrace+0x0/0x298
[   34.758532] __dump_stack+0x20/0x28
[   34.758533] dump_stack+0x74/0x9c
[   34.758535] ubsan_epilogue+0xc/0x48
[   34.758538] __ubsan_handle_divrem_overflow+0x184/0x198
[   34.758540] _sde_crtc_setup_lm_bounds+0x300/0x318
[   34.758541] sde_crtc_atomic_check+0x260/0x253c
[   34.758543] drm_atomic_helper_check_planes+0x1b0/0x224
[   34.758544] sde_kms_atomic_check+0xb4/0x2f4
[   34.758545] drm_atomic_check_only+0x410/0x778
[   34.758546] drm_mode_atomic_ioctl+0xb24/0x1020
[   34.758548] drm_ioctl_kernel+0x21c/0x2c0
[   34.758549] drm_ioctl+0x2d0/0x434
[   34.758551] do_vfs_ioctl+0x9b4/0xf9c
[   34.758552] __arm64_sys_ioctl+0x128/0x144
[   34.758553] el0_svc_common+0xdc/0x158
[   34.758554] el0_svc+0x8/0x700
[   34.758555] ================================================================================

Fixes: 4fef803aff ("disp: msm: sde: increase max number of mixers to 4")
Change-Id: Idb60e329ffb47d842bb0b4a16b3d086cc4ec16bc
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>
This commit is contained in:
Alexander Winkowski 2026-05-24 16:08:26 +00:00
commit 3a757c1357
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GPG key ID: 72762A66704CDE44
1 changed files with 2 additions and 1 deletions
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3
techpack/display/msm/sde/sde_crtc.h
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@ -519,7 +519,8 @@ static inline int sde_crtc_get_mixer_width(struct sde_crtc *sde_crtc,
if (cstate->num_ds_enabled)
mixer_width = cstate->ds_cfg[0].lm_width;
else
mixer_width = mode->hdisplay / sde_crtc->num_mixers;
mixer_width = sde_crtc->num_mixers ?
mode->hdisplay / sde_crtc->num_mixers : mode->hdisplay;
return mixer_width;
}