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ksym_tracer: Fix to allow writing newline to ksym_trace_filter

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It used to work, but now doesn't:

 # echo > ksym_filter
 bash: echo: write error: Invalid argument

It's caused by d954fbf0ff
("tracing: Fix wrong usage of strstrip in trace_ksyms").

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B3AF1D7.5040400@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-12-30 14:23:19 +08:00 committed by Ingo Molnar
parent 88f7a890d7
commit 3d13ec2efd
1 changed files with 2 additions and 2 deletions
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4
kernel/trace/trace_ksym.c
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@ -299,8 +299,8 @@ static ssize_t ksym_trace_filter_write(struct file *file,
* 2: echo 0 > ksym_trace_filter
* 3: echo "*:---" > ksym_trace_filter
*/
if (!buf[0] || !strcmp(buf, "0") ||
!strcmp(buf, "*:---")) {
if (!input_string[0] || !strcmp(input_string, "0") ||
!strcmp(input_string, "*:---")) {
__ksym_trace_reset();
ret = 0;
goto out;