[PATCH v2] mtd: maps: add missing iounmap() in error path

[Luis Henriques]

This patch was triggered by the following Coccinelle error:

./drivers/mtd/maps/sc520cdp.c:246:3-9: \
        ERROR: missing iounmap; ioremap on line 242 \
        and execution via conditional on line 244

Since do_map_probe() is also invoked in this loop, it is also necessary to
map_destroy() any initialised struct mtd_info.

Signed-off-by: Luis Henriques <hen...@camandro.org>
---
Changes since v1:
* Changes according to Brian Norris review:
  - Ensure sc520cdp_map[0].virt is unmaped when needed
  - Use a for loop instead of an 'if (i)'
  - Prevent double-iounmap
* Added map_destroy() in the cleanup

drivers/mtd/maps/sc520cdp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/maps/sc520cdp.c b/drivers/mtd/maps/sc520cdp.c
index 093edd51bdc7..9b1c13aa9f20 100644
--- a/drivers/mtd/maps/sc520cdp.c
+++ b/drivers/mtd/maps/sc520cdp.c
@@ -227,7 +227,7 @@ static void sc520cdp_setup_par(void)
 
 static int __init init_sc520cdp(void)
 {
-       int i, devices_found = 0;
+       int i, j, devices_found = 0;
 
 #ifdef REPROGRAM_PAR
        /* reprogram PAR registers so flash appears at the desired addresses */
@@ -243,6 +243,12 @@ static int __init init_sc520cdp(void)
 
                if (!sc520cdp_map[i].virt) {
                        printk("Failed to ioremap_nocache\n");
+                       for (j = 0; j < i; j++) {
+                               if (mymtd[j]) {
+                                       map_destroy(mymtd[j]);
+                                       iounmap(sc520cdp_map[j].virt);
+                               }
+                       }
                        return -EIO;
                }