[PATCH] ioremap balanced with iounmap for drivers/serial/mpsc.c

ioremap must be balanced by an iounmap and failing to do so can result
in a memory leak.
Signed-off-by: NAmol Lad <amol@verismonetworks.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/serial/mpsc.c

@@ -1893,6 +1893,10 @@ mpsc_drv_map_regs(struct mpsc_port_info *pi, struct platform_device *pd)
 	}
 	else {
 		mpsc_resource_err("SDMA base");
+		if (pi->mpsc_base) {
+			iounmap(pi->mpsc_base);
+			pi->mpsc_base = NULL;
+		}
 		return -ENOMEM;
 	}
 
@@ -1905,6 +1909,14 @@ mpsc_drv_map_regs(struct mpsc_port_info *pi, struct platform_device *pd)
 	}
 	else {
 		mpsc_resource_err("BRG base");
+		if (pi->mpsc_base) {
+			iounmap(pi->mpsc_base);
+			pi->mpsc_base = NULL;
+		}
+		if (pi->sdma_base) {
+			iounmap(pi->sdma_base);
+			pi->sdma_base = NULL;
+		}
 		return -ENOMEM;
 	}