NTB: Fix oops in debugfs when transport is half-up

[deliverable/linux.git] / drivers / ntb / ntb_transport.c

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 25e973ff64cfba63a323027a9acaa1347e2c9527..a049f96fab8d44c335e94c9f69d8b48dfbc1e281 100644 (file)
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -439,13 +439,17 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
        char *buf;
        ssize_t ret, out_offset, out_count;
 
+       qp = filp->private_data;
+
+       if (!qp || !qp->link_is_up)
+               return 0;
+
        out_count = 1000;
 
        buf = kmalloc(out_count, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;
 
-       qp = filp->private_data;
        out_offset = 0;
        out_offset += snprintf(buf + out_offset, out_count - out_offset,
                               "NTB QP stats\n");