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linux/dim: Do nothing if no time delta between samples

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Add return value for dim_calc_stats. This is an indication for the
caller if curr_stats was assigned by the function. Avoid using
curr_stats uninitialized over {rdma/net}_dim, when no time delta between
samples. Coverity reported this potential use of an uninitialized
variable.

Fixes: 4c4dbb4a73 ("net/mlx5e: Move dynamic interrupt coalescing code to include/linux")
Fixes: cb3c7fd4f8 ("net/mlx5e: Support adaptive RX coalescing")
Signed-off-by: Roy Novich <royno@nvidia.com>
Reviewed-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
Link: https://lore.kernel.org/r/20230507135743.138993-1-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Roy Novich 2023-05-07 16:57:43 +03:00 • committed by Paolo Abeni
parent 27c1eaa072
commit 162bd18eb5
4 changed files with 9 additions and 5 deletions
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3
include/linux/dim.h
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@ -236,8 +236,9 @@ void dim_park_tired(struct dim *dim);
*
* Calculate the delta between two samples (in data rates).
* Takes into consideration counter wrap-around.
* Returned boolean indicates whether curr_stats are reliable.
*/
void dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
bool dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
struct dim_stats *curr_stats);
/**