powerpc/nvram: Fix an incorrect partition merge

commit 11b7e154b132232535befe51c55db048069c8461 upstream.

When we merge two contiguous partitions whose signatures are marked
NVRAM_SIG_FREE, We need update prev's length and checksum, then write it
to nvram, not cur's. So lets fix this mistake now.

Also use memset instead of strncpy to set the partition's name. It's
more readable if we want to fill up with duplicate chars .

Fixes: fa2b4e54d41f ("powerpc/nvram: Improve partition removal")
Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index 48fbc2b97e952114c45162515ed211a9d40be40a..4047d8a035f72d7646080225de7d69ff849bbd5d 100644 (file)
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -280,7 +280,7 @@ int __init nvram_remove_partition(const char *name, int sig,
 
                /* Make partition a free partition */
                part->header.signature = NVRAM_SIG_FREE;
-               strncpy(part->header.name, "wwwwwwwwwwww", 12);
+               memset(part->header.name, 'w', 12);
                part->header.checksum = nvram_checksum(&part->header);
                rc = nvram_write_header(part);
                if (rc <= 0) {
@@ -298,8 +298,8 @@ int __init nvram_remove_partition(const char *name, int sig,
                }
                if (prev) {
                        prev->header.length += part->header.length;
-                       prev->header.checksum = nvram_checksum(&part->header);
-                       rc = nvram_write_header(part);
+                       prev->header.checksum = nvram_checksum(&prev->header);
+                       rc = nvram_write_header(prev);
                        if (rc <= 0) {
                                printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
                                return rc;