[11/22] RDS: Make use of the new sg_map helper function

Commit Message

Logan Gunthorpe April 13, 2017, 10:05 p.m. UTC

Straightforward conversion except there's no error path, so we WARN if
the sg_map fails.

Signed-off-by: Logan Gunthorpe <[e-mail]>
---
 net/rds/ib_recv.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

Patch

diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c
index e10624a..7f8fa99 100644
--- a/net/rds/ib_recv.c
+++ b/net/rds/ib_recv.c
@@ -801,9 +801,20 @@  static void rds_ib_cong_recv(struct rds_connection *conn,
 		to_copy = min(RDS_FRAG_SIZE - frag_off, PAGE_SIZE - map_off);
 		BUG_ON(to_copy & 7); /* Must be 64bit aligned. */
 
-		addr = kmap_atomic(sg_page(&frag->f_sg));
+		addr = sg_map(&frag->f_sg, SG_KMAP_ATOMIC);
+		if (IS_ERR(addr)) {
+			/*
+			 * This should really never happen unless
+			 * the code is changed to use memory that is
+			 * not mappable in the sg. Seeing there doesn't
+			 * seem to be any error path out of here,
+			 * we can only WARN.
+			 */
+			WARN(1, "Non-mappable memory used in sg!");
+			return;
+		}
 
-		src = addr + frag->f_sg.offset + frag_off;
+		src = addr + frag_off;
 		dst = (void *)map->m_page_addrs[map_page] + map_off;
 		for (k = 0; k < to_copy; k += 8) {
 			/* Record ports that became uncongested, ie
@@ -811,7 +822,7 @@  static void rds_ib_cong_recv(struct rds_connection *conn,
 			uncongested |= ~(*src) & *dst;
 			*dst++ = *src++;
 		}
-		kunmap_atomic(addr);
+		sg_unmap(&frag->f_sg, addr, SG_KMAP_ATOMIC);
 
 		copied += to_copy;