Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[pandora-kernel.git] / kernel / trace / ftrace.c

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index cc615f8..46592fe 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1520,7 +1520,7 @@ static int t_show(struct seq_file *m, void *v)
        return 0;
 }
 
-static struct seq_operations show_ftrace_seq_ops = {
+static const struct seq_operations show_ftrace_seq_ops = {
        .start = t_start,
        .next = t_next,
        .stop = t_stop,
@@ -1621,8 +1621,10 @@ ftrace_regex_open(struct inode *inode, struct file *file, int enable)
                if (!ret) {
                        struct seq_file *m = file->private_data;
                        m->private = iter;
-               } else
+               } else {
+                       trace_parser_put(&iter->parser);
                        kfree(iter);
+               }
        } else
                file->private_data = iter;
        mutex_unlock(&ftrace_regex_lock);
@@ -2202,7 +2204,7 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
        struct trace_parser *parser;
        ssize_t ret, read;
 
-       if (!cnt || cnt < 0)
+       if (!cnt)
                return 0;
 
        mutex_lock(&ftrace_regex_lock);
@@ -2216,7 +2218,7 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
        parser = &iter->parser;
        read = trace_get_user(parser, ubuf, cnt, ppos);
 
-       if (trace_parser_loaded(parser) &&
+       if (read >= 0 && trace_parser_loaded(parser) &&
            !trace_parser_cont(parser)) {
                ret = ftrace_process_regex(parser->buffer,
                                           parser->idx, enable);
@@ -2414,11 +2416,9 @@ unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS] __read_mostly;
 static void *
 __g_next(struct seq_file *m, loff_t *pos)
 {
-       unsigned long *array = m->private;
-
        if (*pos >= ftrace_graph_count)
                return NULL;
-       return &array[*pos];
+       return &ftrace_graph_funcs[*pos];
 }
 
 static void *
@@ -2461,7 +2461,7 @@ static int g_show(struct seq_file *m, void *v)
        return 0;
 }
 
-static struct seq_operations ftrace_graph_seq_ops = {
+static const struct seq_operations ftrace_graph_seq_ops = {
        .start = g_start,
        .next = g_next,
        .stop = g_stop,
@@ -2482,16 +2482,10 @@ ftrace_graph_open(struct inode *inode, struct file *file)
                ftrace_graph_count = 0;
                memset(ftrace_graph_funcs, 0, sizeof(ftrace_graph_funcs));
        }
+       mutex_unlock(&graph_lock);
 
-       if (file->f_mode & FMODE_READ) {
+       if (file->f_mode & FMODE_READ)
                ret = seq_open(file, &ftrace_graph_seq_ops);
-               if (!ret) {
-                       struct seq_file *m = file->private_data;
-                       m->private = ftrace_graph_funcs;
-               }
-       } else
-               file->private_data = ftrace_graph_funcs;
-       mutex_unlock(&graph_lock);
 
        return ret;
 }
@@ -2560,9 +2554,7 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
                   size_t cnt, loff_t *ppos)
 {
        struct trace_parser parser;
-       unsigned long *array;
-       size_t read = 0;
-       ssize_t ret;
+       ssize_t read, ret;
 
        if (!cnt || cnt < 0)
                return 0;
@@ -2571,35 +2563,31 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
 
        if (ftrace_graph_count >= FTRACE_GRAPH_MAX_FUNCS) {
                ret = -EBUSY;
-               goto out;
+               goto out_unlock;
        }
 
-       if (file->f_mode & FMODE_READ) {
-               struct seq_file *m = file->private_data;
-               array = m->private;
-       } else
-               array = file->private_data;
-
        if (trace_parser_get_init(&parser, FTRACE_BUFF_MAX)) {
                ret = -ENOMEM;
-               goto out;
+               goto out_unlock;
        }
 
        read = trace_get_user(&parser, ubuf, cnt, ppos);
 
-       if (trace_parser_loaded((&parser))) {
+       if (read >= 0 && trace_parser_loaded((&parser))) {
                parser.buffer[parser.idx] = 0;
 
                /* we allow only one expression at a time */
-               ret = ftrace_set_func(array, &ftrace_graph_count,
+               ret = ftrace_set_func(ftrace_graph_funcs, &ftrace_graph_count,
                                        parser.buffer);
                if (ret)
-                       goto out;
+                       goto out_free;
        }
 
        ret = read;
- out:
+
+out_free:
        trace_parser_put(&parser);
+out_unlock:
        mutex_unlock(&graph_lock);
 
        return ret;
@@ -3030,7 +3018,7 @@ int unregister_ftrace_function(struct ftrace_ops *ops)
 
 int
 ftrace_enable_sysctl(struct ctl_table *table, int write,
-                    struct file *file, void __user *buffer, size_t *lenp,
+                    void __user *buffer, size_t *lenp,
                     loff_t *ppos)
 {
        int ret;
@@ -3040,7 +3028,7 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
 
        mutex_lock(&ftrace_lock);
 
-       ret  = proc_dointvec(table, write, file, buffer, lenp, ppos);
+       ret  = proc_dointvec(table, write, buffer, lenp, ppos);
 
        if (ret || !write || (last_ftrace_enabled == !!ftrace_enabled))
                goto out;