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Subject[PATCH -tip] Return an error when setting a nonexistent tracer
When one try to set a nonexistent tracer, no error is returned
as if the name of the tracer was correct.
We should return -EINVAL.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
---
kernel/trace/trace.c | 13 ++++++++++---
1 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 1cd2e81..9b30473 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2384,9 +2384,11 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
struct tracer *t;
char buf[max_tracer_type_len+1];
int i;
+ size_t ret;

if (cnt > max_tracer_type_len)
cnt = max_tracer_type_len;
+ ret = cnt;

if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
@@ -2402,7 +2404,11 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
if (strcmp(t->name, buf) == 0)
break;
}
- if (!t || t == current_trace)
+ if (!t) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (t == current_trace)
goto out;

if (current_trace && current_trace->reset)
@@ -2415,9 +2421,10 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
out:
mutex_unlock(&trace_types_lock);

- filp->f_pos += cnt;
+ if (ret == cnt)
+ filp->f_pos += cnt;

- return cnt;
+ return ret;
}

static ssize_t

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