linux/kernel/trace
Steven Rostedt 60063a6623 ftrace: fix current_tracer error return
The commit (in linux-tip) c2931e05ec
 ( ftrace: return an error when setting a nonexistent tracer )
added useful code that would error when a bad tracer was written into
the current_tracer file.

But this had a bug if the amount written was more than the amount read by
that code. The first iteration would set the tracer correctly, but since
it did not consume the rest of what was written (usually whitespace), the
userspace utility would continue to write what was not consumed. This
second iteration would fail to find a tracer and return -EINVAL. Funny
thing is that the tracer would have already been set.

This patch just consumes all the data that is written to the file.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-28 16:33:47 +01:00
..
Kconfig tracing/ftrace: make boot tracer select the sched_switch tracer 2008-10-27 16:47:13 +01:00
Makefile ftrace: rename FTRACE to FUNCTION_TRACER 2008-10-20 18:27:03 +02:00
ftrace.c ftrace: warning in kernel/trace/ftrace.c 2008-10-24 12:52:44 +02:00
ring_buffer.c trace: fix printk warning for u64 2008-10-27 11:31:58 +01:00
trace.c ftrace: fix current_tracer error return 2008-10-28 16:33:47 +01:00
trace.h ftrace: rename FTRACE to FUNCTION_TRACER 2008-10-20 18:27:03 +02:00
trace_boot.c tracing/fastboot: fix printk format typo in boot tracer 2008-10-14 10:39:23 +02:00
trace_functions.c ftrace: rename the ftrace tracer to function 2008-10-20 18:27:04 +02:00
trace_irqsoff.c ftrace: rename FTRACE to FUNCTION_TRACER 2008-10-20 18:27:03 +02:00
trace_mmiotrace.c ftrace: preempt disable over interrupt disable 2008-10-14 10:39:09 +02:00
trace_nop.c ftrace: make work with new ring buffer 2008-10-14 10:38:57 +02:00
trace_sched_switch.c ftrace: make some tracers reentrant 2008-10-14 10:39:20 +02:00
trace_sched_wakeup.c ftrace: rename FTRACE to FUNCTION_TRACER 2008-10-20 18:27:03 +02:00
trace_selftest.c ftrace: remove daemon 2008-10-23 16:00:22 +02:00
trace_selftest_dynamic.c ftrace: fix dynamic ftrace selftest 2008-05-23 21:13:23 +02:00
trace_stack.c ftrace: stack tracer only record when on stack 2008-10-20 18:31:37 +02:00
trace_sysprof.c ftrace: make work with new ring buffer 2008-10-14 10:38:57 +02:00