RDMA/cxgb4: Use simple_read_from_buffer() for debugfs handlers

We can replace our equivalent open-coded version.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 1 insertions, 25 deletions

diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
index b25435736d44..22a290d0d5bf 100644
--- a/drivers/infiniband/hw/cxgb4/device.c
+++ b/drivers/infiniband/hw/cxgb4/device.c
@@ -68,32 +68,8 @@ static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
                             loff_t *ppos)
 {
         struct c4iw_debugfs_data *d = file->private_data;
-        loff_t pos = *ppos;
-        loff_t avail = d->pos;
 
-        if (pos < 0)
-                return -EINVAL;
-        if (pos >= avail)
-                return 0;
-        if (count > avail - pos)
-                count = avail - pos;
-
-        while (count) {
-                size_t len = 0;
-
-                len = min((int)count, (int)d->pos - (int)pos);
-                if (copy_to_user(buf, d->buf + pos, len))
-                        return -EFAULT;
-                if (len == 0)
-                        return -EINVAL;
-
-                buf += len;
-                pos += len;
-                count -= len;
-        }
-        count = pos - *ppos;
-        *ppos = pos;
-        return count;
+        return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
 }
 
 static int dump_qp(int id, void *p, void *data)