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-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etr.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index df6e4b0b84e9..cc8401c76c39 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1501,14 +1501,13 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
tmc_etr_sync_perf_buffer(etr_perf);
/*
- * Update handle->head in snapshot mode. Also update the size to the
- * hardware buffer size if there was an overflow.
+ * In snapshot mode we simply increment the head by the number of byte
+ * that were written. User space function cs_etm_find_snapshot() will
+ * figure out how many bytes to get from the AUX buffer based on the
+ * position of the head.
*/
- if (etr_perf->snapshot) {
+ if (etr_perf->snapshot)
handle->head += size;
- if (etr_buf->full)
- size = etr_buf->size;
- }
lost |= etr_buf->full;
out: