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tracing_bprintk: Don't increment @pos in t_start()

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It's wrong to increment @pos in t_start(), otherwise we'll lose
some entries when reading printk_formats, if the output is larger
than PAGE_SIZE.

Reported-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Reviewed-by: Liming Wang <liming.wang@windriver.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A4186FA.1020106@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-06-24 09:52:58 +08:00 committed by Ingo Molnar
parent e1c7e2a6e6
commit c8961ec6da
1 changed files with 6 additions and 20 deletions
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26
kernel/trace/trace_printk.c
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@ -155,25 +155,19 @@ int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
EXPORT_SYMBOL_GPL(__ftrace_vprintk);
static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
t_start(struct seq_file *m, loff_t *pos)
{
const char **fmt = m->private;
const char **next = fmt;
(*pos)++;
const char **fmt = __start___trace_bprintk_fmt + *pos;
if ((unsigned long)fmt >= (unsigned long)__stop___trace_bprintk_fmt)
return NULL;
next = fmt;
m->private = ++next;
return fmt;
}
static void *t_start(struct seq_file *m, loff_t *pos)
static void *t_next(struct seq_file *m, void * v, loff_t *pos)
{
return t_next(m, NULL, pos);
(*pos)++;
return t_start(m, pos);
}
static int t_show(struct seq_file *m, void *v)
@ -224,15 +218,7 @@ static const struct seq_operations show_format_seq_ops = {
static int
ftrace_formats_open(struct inode *inode, struct file *file)
{
int ret;
ret = seq_open(file, &show_format_seq_ops);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = __start___trace_bprintk_fmt;
}
return ret;
return seq_open(file, &show_format_seq_ops);
}
static const struct file_operations ftrace_formats_fops = {