diff options
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/util/mmap.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c index f6cfc52ff1fe..fc832676a798 100644 --- a/tools/perf/util/mmap.c +++ b/tools/perf/util/mmap.c @@ -234,7 +234,7 @@ static int overwrite_rb_find_range(void *buf, int mask, u64 *start, u64 *end) /* * Report the start and end of the available data in ringbuffer */ -int perf_mmap__read_init(struct perf_mmap *md) +static int __perf_mmap__read_init(struct perf_mmap *md) { u64 head = perf_mmap__read_head(md); u64 old = md->prev; @@ -268,6 +268,17 @@ int perf_mmap__read_init(struct perf_mmap *md) return 0; } +int perf_mmap__read_init(struct perf_mmap *map) +{ + /* + * Check if event was unmapped due to a POLLHUP/POLLERR. + */ + if (!refcount_read(&map->refcnt)) + return -ENOENT; + + return __perf_mmap__read_init(map); +} + int perf_mmap__push(struct perf_mmap *md, void *to, int push(void *to, void *buf, size_t size)) { |