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powerpc/nvram: Fix endian issue when using the partition length

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When reading partitions, the length has to be translated from
big endian to the endian order of the host. Similarly, when writing
partitions, the length needs to be in big endian order.

The userspace tool 'nvram' needs a similar fix as it is reading
and writing partitions through /dev/nram :

    http://sourceforge.net/p/powerpc-utils/mailman/message/31571277/

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Cedric Le Goater 2013-10-30 14:47:08 +01:00 committed by Benjamin Herrenschmidt
parent 563c5d8af5
commit c81095a465
1 changed files with 8 additions and 2 deletions
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10
arch/powerpc/kernel/nvram_64.c
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@ -223,9 +223,13 @@ static int __init nvram_write_header(struct nvram_partition * part)
{
loff_t tmp_index;
int rc;
struct nvram_header phead;
memcpy(&phead, &part->header, NVRAM_HEADER_LEN);
phead.length = cpu_to_be16(phead.length);
tmp_index = part->index;
rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index);
rc = ppc_md.nvram_write((char *)&phead, NVRAM_HEADER_LEN, &tmp_index);
return rc;
}
@ -505,6 +509,8 @@ int __init nvram_scan_partitions(void)
memcpy(&phead, header, NVRAM_HEADER_LEN);
phead.length = be16_to_cpu(phead.length);
err = 0;
c_sum = nvram_checksum(&phead);
if (c_sum != phead.checksum) {