size_t offset = ctx->buf_offset;
struct lttng_ust_lib_ring_buffer_backend_pages_shmp *rpages;
unsigned long sb_bindex, id;
+ struct lttng_ust_lib_ring_buffer_backend_pages *backend_pages;
+ void *p;
if (caa_unlikely(!len))
return;
id = shmp_index(handle, bufb->buf_wsb, sbidx)->id;
sb_bindex = subbuffer_id_get_index(config, id);
rpages = shmp_index(handle, bufb->array, sb_bindex);
+ if (caa_unlikely(!rpages))
+ return;
CHAN_WARN_ON(ctx->chan,
config->mode == RING_BUFFER_OVERWRITE
&& subbuffer_id_is_noref(config, id));
* subbuffers.
*/
CHAN_WARN_ON(chanb, offset >= chanb->buf_size);
- lib_ring_buffer_do_copy(config,
- shmp_index(handle, shmp(handle, rpages->shmp)->p, offset & (chanb->subbuf_size - 1)),
- src, len);
+ backend_pages = shmp(handle, rpages->shmp);
+ if (caa_unlikely(!backend_pages))
+ return;
+ p = shmp_index(handle, backend_pages->p, offset & (chanb->subbuf_size - 1));
+ if (caa_unlikely(!p))
+ return;
+ lib_ring_buffer_do_copy(config, p, src, len);
ctx->buf_offset += len;
}
struct lttng_ust_shm_handle *handle)
{
struct lttng_ust_lib_ring_buffer_backend *bufb = &buf->backend;
- struct lttng_ust_lib_ring_buffer_backend_pages_shmp *pages;
- unsigned long records_unread = 0, sb_bindex, id;
+ unsigned long records_unread = 0, sb_bindex;
unsigned int i;
+ struct channel *chan;
- for (i = 0; i < shmp(handle, bufb->chan)->backend.num_subbuf; i++) {
- id = shmp_index(handle, bufb->buf_wsb, i)->id;
- sb_bindex = subbuffer_id_get_index(config, id);
- pages = shmp_index(handle, bufb->array, sb_bindex);
- records_unread += v_read(config, &shmp(handle, pages->shmp)->records_unread);
+ chan = shmp(handle, bufb->chan);
+ if (!chan)
+ return 0;
+ for (i = 0; i < chan->backend.num_subbuf; i++) {
+ struct lttng_ust_lib_ring_buffer_backend_subbuffer *wsb;
+ struct lttng_ust_lib_ring_buffer_backend_pages_shmp *rpages;
+ struct lttng_ust_lib_ring_buffer_backend_pages *backend_pages;
+
+ wsb = shmp_index(handle, bufb->buf_wsb, i);
+ if (!wsb)
+ return 0;
+ sb_bindex = subbuffer_id_get_index(config, wsb->id);
+ rpages = shmp_index(handle, bufb->array, sb_bindex);
+ if (!rpages)
+ return 0;
+ backend_pages = shmp(handle, rpages->shmp);
+ if (!backend_pages)
+ return 0;
+ records_unread += v_read(config, &backend_pages->records_unread);
}
if (config->mode == RING_BUFFER_OVERWRITE) {
- id = bufb->buf_rsb.id;
- sb_bindex = subbuffer_id_get_index(config, id);
- pages = shmp_index(handle, bufb->array, sb_bindex);
- records_unread += v_read(config, &shmp(handle, pages->shmp)->records_unread);
+ struct lttng_ust_lib_ring_buffer_backend_pages_shmp *rpages;
+ struct lttng_ust_lib_ring_buffer_backend_pages *backend_pages;
+
+ sb_bindex = subbuffer_id_get_index(config, bufb->buf_rsb.id);
+ rpages = shmp_index(handle, bufb->array, sb_bindex);
+ if (!rpages)
+ return 0;
+ backend_pages = shmp(handle, rpages->shmp);
+ if (!backend_pages)
+ return 0;
+ records_unread += v_read(config, &backend_pages->records_unread);
}
return records_unread;
}