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Avoid unnecessary Write Cycle

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David Sidrane 2016-07-13 04:11:08 -10:00 committed by Julian Oes
parent 5d1bd6fb2c
commit 8a2df2a458
1 changed files with 17 additions and 3 deletions
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20
src/modules/systemlib/flashparams/flashparams.c
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@ -183,11 +183,25 @@ out:
if (result == OK) {
/* Check for a write that has no changes */
uint8_t *was_buffer;
size_t was_buf_size;
int was_result = parameter_flashfs_read(parameters_token, &was_buffer, &was_buf_size);
void *enc_buff = bson_encoder_buf_data(&encoder);
memcpy(buffer, enc_buff, buf_size);
bool commit = was_result < OK || was_buf_size != buf_size || 0 != memcmp(was_buffer, enc_buff, was_buf_size);
if (commit) {
memcpy(buffer, enc_buff, buf_size);
result = parameter_flashfs_write(parameters_token, buffer, buf_size);
result = result == buf_size ? OK : -EFBIG;
}
free(enc_buff);
result = parameter_flashfs_write(parameters_token, buffer, buf_size);
result = result == buf_size ? OK : -EFBIG;
}
}