net/mlx5: fw_tracer, allow 0 size string DBs

Device can expose string DB of size 0 which means this string DB is
currently not in use. Therefore, allow for 0 size string DBs.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
index 4ce75cef46c84ca5547e81bb79dbaf0b862da048..de98357dfd14b2b3e7222394f3623683525a689d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
@@ -233,6 +233,8 @@ static int mlx5_fw_tracer_allocate_strings_db(struct mlx5_fw_tracer *tracer)
        int i;
 
        for (i = 0; i < num_string_db; i++) {
+               if (!string_db_size_out[i])
+                       continue;
                tracer->str_db.buffer[i] = kzalloc(string_db_size_out[i], GFP_KERNEL);
                if (!tracer->str_db.buffer[i])
                        goto free_strings_db;
@@ -278,6 +280,8 @@ static void mlx5_tracer_read_strings_db(struct work_struct *work)
        }
 
        for (i = 0; i < num_string_db; i++) {
+               if (!tracer->str_db.size_out[i])
+                       continue;
                offset = 0;
                MLX5_SET(mtrc_stdb, in, string_db_index, i);
                num_of_reads = tracer->str_db.size_out[i] /
@@ -384,6 +388,8 @@ static struct tracer_string_format *mlx5_tracer_get_string(struct mlx5_fw_tracer
        str_ptr = tracer_event->string_event.string_param;
 
        for (i = 0; i < tracer->str_db.num_string_db; i++) {
+               if (!tracer->str_db.size_out[i])
+                       continue;
                if (str_ptr > tracer->str_db.base_address_out[i] &&
                    str_ptr < tracer->str_db.base_address_out[i] +
                    tracer->str_db.size_out[i]) {