powerpc/nvram: Fix an incorrect partition merge

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>

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index 6cd3a45880c09adb2481c9872041218f6ebf1659..34d2c595de23baff57351bbed16764c699d55800 100644 (file)
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -956,7 +956,7 @@ 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) {
@@ -974,8 +974,8 @@ 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;