sunrpc: use simple_read_from_buffer for reading cache flush

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 3 insertions, 12 deletions

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 9e8561d1714d..2f06f510b570 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1427,20 +1427,11 @@ static ssize_t read_flush(struct file *file, char __user *buf,
                           struct cache_detail *cd)
 {
         char tbuf[22];
-        unsigned long p = *ppos;
         size_t len;
 
-        snprintf(tbuf, sizeof(tbuf), "%lu\n", convert_to_wallclock(cd->flush_time));
-        len = strlen(tbuf);
-        if (p >= len)
-                return 0;
-        len -= p;
-        if (len > count)
-                len = count;
-        if (copy_to_user(buf, (void*)(tbuf+p), len))
-                return -EFAULT;
-        *ppos += len;
-        return len;
+        len = snprintf(tbuf, sizeof(tbuf), "%lu\n",
+                        convert_to_wallclock(cd->flush_time));
+        return simple_read_from_buffer(buf, count, ppos, tbuf, len);
 }
 
 static ssize_t write_flush(struct file *file, const char __user *buf,