From: Namhyung Kim <[email protected]> It looks like tracing_release() lacks checking iter->cpu_file so that closing a per_cpu trace file would attempt to close all cpu buffers.
Signed-off-by: Namhyung Kim <[email protected]> --- kernel/trace/trace.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 7270460cfe3c..0beddcb80509 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2883,7 +2883,13 @@ static int tracing_release(struct inode *inode, struct file *file) WARN_ON(!tr->ref); tr->ref--; - for_each_tracing_cpu(cpu) { + if (iter->cpu_file == RING_BUFFER_ALL_CPUS) { + for_each_tracing_cpu(cpu) { + if (iter->buffer_iter[cpu]) + ring_buffer_read_finish(iter->buffer_iter[cpu]); + } + } else { + cpu = iter->cpu_file; if (iter->buffer_iter[cpu]) ring_buffer_read_finish(iter->buffer_iter[cpu]); } -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
