From: Bart Van Assche <bart.vanassche@sandisk.com>
Date: Mon, 21 Nov 2016 21:57:24 +0000 (-0800)
Subject: IB/srp: Make login failures easier to debug
X-Git-Tag: v4.10-rc1~20^2~16^6~2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=3787d9908c4e05af0322613fe7f8c617c1ddb1d5;p=linux-block.git

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 c216c6eaef26..81cb27f2f0e6 100644
--- 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;