From 290081b45342ef902ed756f929fa9e4feb9f7dab Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@sandisk.com>
Date: Mon, 21 Nov 2016 13:57:41 -0800
Subject: [PATCH] IB/srp: Make mapping failures easier to debug

Make it easier to figure out what is going on if memory mapping
fails because more memory regions than mr_per_cmd are needed.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
---
 drivers/infiniband/ulp/srp/ib_srp.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 81cb27f2f0e6..bb9d73daadfa 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1274,8 +1274,12 @@ static int srp_map_finish_fmr(struct srp_map_state *state,
 	struct ib_pool_fmr *fmr;
 	u64 io_addr = 0;
 
-	if (state->fmr.next >= state->fmr.end)
+	if (state->fmr.next >= state->fmr.end) {
+		shost_printk(KERN_ERR, ch->target->scsi_host,
+			     PFX "Out of MRs (mr_per_cmd = %d)\n",
+			     ch->target->mr_per_cmd);
 		return -ENOMEM;
+	}
 
 	WARN_ON_ONCE(!dev->use_fmr);
 
@@ -1331,8 +1335,12 @@ static int srp_map_finish_fr(struct srp_map_state *state,
 	u32 rkey;
 	int n, err;
 
-	if (state->fr.next >= state->fr.end)
+	if (state->fr.next >= state->fr.end) {
+		shost_printk(KERN_ERR, ch->target->scsi_host,
+			     PFX "Out of MRs (mr_per_cmd = %d)\n",
+			     ch->target->mr_per_cmd);
 		return -ENOMEM;
+	}
 
 	WARN_ON_ONCE(!dev->use_fast_reg);
 
-- 
2.20.1