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drm/amd/display: Fix possible overflow in integer multiplication

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[WHAT & HOW]
Integer multiplies integer may overflow in context that expects an
expression of unsigned/siged long long (64 bits). This can be fixed
by casting integer to unsigned/siged long long to force 64 bits results.

This fixes 26 OVERFLOW_BEFORE_WIDEN issues reported by Coverity.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Hung
2024-06-07 22:09:53 -06:00
committed by Alex Deucher
parent 95134e5852
commit bbd0d1c942
13 changed files with 24 additions and 24 deletions
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2
drivers/gpu/drm/amd/display/dc/basics/dce_calcs.c
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@@ -1853,7 +1853,7 @@ static void calculate_bandwidth(
/*compute total time to request one chunk from each active display pipe*/
for (i = 0; i <= maximum_number_of_surfaces - 1; i++) {
if (data->enable[i]) {
data->chunk_request_time = bw_add(data->chunk_request_time, (bw_div((bw_div(bw_int_to_fixed(pixels_per_chunk * data->bytes_per_pixel[i]), data->useful_bytes_per_request[i])), bw_min2(sclk[data->sclk_level], bw_div(data->dispclk, bw_int_to_fixed(2))))));
data->chunk_request_time = bw_add(data->chunk_request_time, (bw_div((bw_div(bw_int_to_fixed(pixels_per_chunk * (int64_t)data->bytes_per_pixel[i]), data->useful_bytes_per_request[i])), bw_min2(sclk[data->sclk_level], bw_div(data->dispclk, bw_int_to_fixed(2))))));
}
}
/*compute total time to request cursor data*/