[tip:perf/core] perf symbols: Check return value of filename__read_debuglink()

[tip-bot for Stephane Eranian <tipbot@zytor.com>]

Commit-ID:  0d3dc5e8b85a144aaeb5dc26f7f2113e4c4e7e81
Gitweb:     http://git.kernel.org/tip/0d3dc5e8b85a144aaeb5dc26f7f2113e4c4e7e81
Author:     Stephane Eranian <eranian@google.com>
AuthorDate: Thu, 20 Feb 2014 10:32:55 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 24 Feb 2014 16:24:38 -0300

perf symbols: Check return value of filename__read_debuglink()

When dso__read_binary_type_filename() called, it doesn't check the
return value of filename__read_debuglink() so that it'll try to open the
debuglink file even if it doesn't exist.

Also fix return value of the filename__read_debuglink() as it always
return -1 regardless of the result.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1392859976-32760-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/dso.c        | 4 ++--
 tools/perf/util/symbol-elf.c | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 4045d08..64453d6 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -45,8 +45,8 @@ int dso__read_binary_type_filename(const struct dso *dso,
 			debuglink--;
 		if (*debuglink == '/')
 			debuglink++;
-		filename__read_debuglink(dso->long_name, debuglink,
-					 size - (debuglink - filename));
+		ret = filename__read_debuglink(dso->long_name, debuglink,
+					       size - (debuglink - filename));
 		}
 		break;
 	case DSO_BINARY_TYPE__BUILD_ID_CACHE:
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 3e9f336..8ac4a4f 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -506,6 +506,8 @@ int filename__read_debuglink(const char *filename, char *debuglink,
 	/* the start of this section is a zero-terminated string */
 	strncpy(debuglink, data->d_buf, size);
 
+	err = 0;
+
 out_elf_end:
 	elf_end(elf);
 out_close: