IB/srp: Make login failures easier to debug

If login fails because memory region allocation failed it can be
hard to figure out what happened. Make it easier to figure out
why login failed by logging a message if ib_alloc_mr() fails.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index c216c6eaef268c884d4359bfe735a8b7cb06abc3..81cb27f2f0e67ca7b96f9cee39dec93cee792c25 100644 (file)
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -389,6 +389,9 @@ static struct srp_fr_pool *srp_create_fr_pool(struct ib_device *device,
                                 max_page_list_len);
                if (IS_ERR(mr)) {
                        ret = PTR_ERR(mr);
+                       if (ret == -ENOMEM)
+                               pr_info("%s: ib_alloc_mr() failed. Try to reduce max_cmd_per_lun, max_sect or ch_count\n",
+                                       dev_name(&device->dev));
                        goto destroy_pool;
                }
                d->mr = mr;