From: Pierre-Marc Fournier <pierre-marc.fournier@polymtl.ca>
Date: Mon, 15 Feb 2010 05:21:17 +0000 (-0500)
Subject: ustd: use modulo value for first_subbuf
X-Git-Tag: v0.2~11
X-Git-Url: https://git.lttng.org/?p=ust.git;a=commitdiff_plain;h=54b7447337f23516c8249065a459372b4fdd9326

ustd: use modulo value for first_subbuf

This prevented crash recovery when the buffer filled.
---

diff --git a/ustd/lowlevel.c b/ustd/lowlevel.c
index d8d4cfa..6565749 100644
--- a/ustd/lowlevel.c
+++ b/ustd/lowlevel.c
@@ -91,7 +91,7 @@ void finish_consuming_dead_subbuffer(struct buffer_info *buf)
 	}
 
 	/* Iterate on subbuffers to recover. */
-	for(i_subbuf=first_subbuf; ; i_subbuf++, i_subbuf %= buf->n_subbufs) {
+	for(i_subbuf = first_subbuf % buf->n_subbufs; ; i_subbuf++, i_subbuf %= buf->n_subbufs) {
 		void *tmp;
 		/* commit_seq is the offset in the buffer of the end of the last sequential commit.
 		 * Bytes beyond this limit cannot be recovered. This is a free-running counter. */