175 /** Copies SoE data from an external source.

   176  *

   177  * If the \a mem_size is to small, new memory is allocated.

   178  *

   179  * \retval  0 Success.

   180  * \retval <0 Error code.

   181  */

   182 int ec_soe_request_append_data(

   183         ec_soe_request_t *req, /**< SoE request. */

   184         const uint8_t *source, /**< Source data. */

   185         size_t size /**< Number of bytes in \a source. */

   186         )

   187 {

   188     if (req->data_size + size > req->mem_size) {

   189         size_t new_size = req->mem_size ? req->mem_size * 2 : size;

   190         uint8_t *new_data = (uint8_t *) kmalloc(new_size, GFP_KERNEL);

   191         if (!new_data) {

   192             EC_ERR("Failed to allocate %zu bytes of SoE memory.\n",

   193                     new_size);

   194             return -ENOMEM;

   195         }

   196         memcpy(new_data, req->data, req->data_size);

   197         kfree(req->data);

   198         req->data = new_data;

   199         req->mem_size = new_size;

   200     }

   201 

   202     memcpy(req->data + req->data_size, source, size);

   203     req->data_size += size;

   204     return 0;

   205 }

   206 

   207 /*****************************************************************************/

   208