ioremap balanced with iounmap for drivers/mtd subsystem

ioremap must be balanced by an iounmap and failing to do so can result
in a memory leak.

Tested (compilation only) with:
- allmodconfig
- Modifying drivers/mtd/maps/Kconfig and drivers/mtd/nand/Kconfig to
make sure that the changed file is compiling without warning

Signed-off-by: Amol Lad <amol@verismonetworks.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 27 insertions, 7 deletions

diff --git a/drivers/mtd/maps/nettel.c b/drivers/mtd/maps/nettel.c
index 0994b5b2e331..198e840ff6db 100644
--- a/drivers/mtd/maps/nettel.c
+++ b/drivers/mtd/maps/nettel.c
@@ -277,6 +277,7 @@ int __init nettel_init(void)
 	nettel_amd_map.virt = ioremap_nocache(amdaddr, maxsize);
 	if (!nettel_amd_map.virt) {
 		printk("SNAPGEAR: failed to ioremap() BOOTCS\n");
+		iounmap(nettel_mmcrp);
 		return(-EIO);
 	}
 	simple_map_init(&nettel_amd_map);
@@ -337,7 +338,8 @@ int __init nettel_init(void)
 		nettel_amd_map.virt = NULL;
 #else
 		/* Only AMD flash supported */
-		return(-ENXIO);
+		rc = -ENXIO;
+		goto out_unmap2;
 #endif
 	}
 
@@ -361,14 +363,15 @@ int __init nettel_init(void)
 	nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
 	if (!nettel_intel_map.virt) {
 		printk("SNAPGEAR: failed to ioremap() ROMCS1\n");
-		return(-EIO);
+		rc = -EIO;
+		goto out_unmap2;
 	}
 	simple_map_init(&nettel_intel_map);
 
 	intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
 	if (!intel_mtd) {
-		iounmap(nettel_intel_map.virt);
-		return(-ENXIO);
+		rc = -ENXIO;
+		goto out_unmap1;
 	}
 
 	/* Set PAR to the detected size */
@@ -394,13 +397,14 @@ int __init nettel_init(void)
 	nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
 	if (!nettel_intel_map.virt) {
 		printk("SNAPGEAR: failed to ioremap() ROMCS1/2\n");
-		return(-EIO);
+		rc = -EIO;
+		goto out_unmap2;
 	}
 
 	intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
 	if (! intel_mtd) {
-		iounmap((void *) nettel_intel_map.virt);
-		return(-ENXIO);
+		rc = -ENXIO;
+		goto out_unmap1;
 	}
 
 	intel1size = intel_mtd->size - intel0size;
@@ -456,6 +460,18 @@ int __init nettel_init(void)
 #endif
 
 	return(rc);
+
+#ifdef CONFIG_MTD_CFI_INTELEXT
+out_unmap1:
+	iounmap((void *) nettel_intel_map.virt);
+#endif
+
+out_unmap2:
+	iounmap(nettel_mmcrp);
+	iounmap(nettel_amd_map.virt);
+
+	return(rc);
+		
 }
 
 /****************************************************************************/
@@ -469,6 +485,10 @@ void __exit nettel_cleanup(void)
 		del_mtd_partitions(amd_mtd);
 		map_destroy(amd_mtd);
 	}
+	if (nettel_mmcrp) {
+		iounmap(nettel_mmcrp);
+		nettel_mmcrp = NULL;
+	}
 	if (nettel_amd_map.virt) {
 		iounmap(nettel_amd_map.virt);
 		nettel_amd_map.virt = NULL;