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drm/i915/display: Avoid divide by zero

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skl_crtc_allocate_plane_ddb allow iter.data_rate to be zero
which could cause divide by zero in skl_allocate_plane_ddb,
check against that.

Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Link: https://lore.kernel.org/r/20250905104626.1274147-3-juhapekka.heikkila@gmail.com
This commit is contained in:
Juha-Pekka Heikkila 2025-09-05 13:46:26 +03:00 committed by Mika Kahola
parent 1de89eca20
commit 70a9b201cf
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/display/skl_watermark.c
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@ -1388,7 +1388,7 @@ skl_allocate_plane_ddb(struct skl_plane_ddb_iter *iter,
{
u16 size, extra = 0;
if (data_rate) {
if (data_rate && iter->data_rate) {
extra = min_t(u16, iter->size,
DIV64_U64_ROUND_UP(iter->size * data_rate,
iter->data_rate));