RDMA/siw: Relax from kmap_atomic() use in TX path

Since the transmit path is never executed in an atomic context, we do not
need kmap_atomic() and can always use less demanding kmap().

Link: https://lore.kernel.org/r/20190909132945.30462-1-bmt@zurich.ibm.comSigned-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/sw/siw/siw_qp_tx.c

@@ -76,16 +76,15 @@ static int siw_try_1seg(struct siw_iwarp_tx *c_tx, void *paddr)
 			if (unlikely(!p))
 				return -EFAULT;
 
-			buffer = kmap_atomic(p);
+			buffer = kmap(p);
 
 			if (likely(PAGE_SIZE - off >= bytes)) {
 				memcpy(paddr, buffer + off, bytes);
-				kunmap_atomic(buffer);
 			} else {
 				unsigned long part = bytes - (PAGE_SIZE - off);
 
 				memcpy(paddr, buffer + off, part);
-				kunmap_atomic(buffer);
+				kunmap(p);
 
 				if (!mem->is_pbl)
 					p = siw_get_upage(mem->umem,
@@ -97,11 +96,10 @@ static int siw_try_1seg(struct siw_iwarp_tx *c_tx, void *paddr)
 				if (unlikely(!p))
 					return -EFAULT;
 
-				buffer = kmap_atomic(p);
-				memcpy(paddr + part, buffer,
-				       bytes - part);
-				kunmap_atomic(buffer);
+				buffer = kmap(p);
+				memcpy(paddr + part, buffer, bytes - part);
 			}
+			kunmap(p);
 		}
 	}
 	return (int)bytes;