[PATCH powerpc] init nvram_pstore_info's buf_lock

[Li Zhong]

It seems nvram_pstore_info's buf_lock is not initialized before
registering, which causes some strange behavior when trying to obtain
the lock during kdump process.

Signed-off-by: Li Zhong <zhong at linux.vnet.ibm.com>
---
 arch/powerpc/platforms/pseries/nvram.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index 11a3b61..054a0ed 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -715,6 +715,8 @@ static int nvram_pstore_init(void)
 	nvram_pstore_info.buf = oops_data;
 	nvram_pstore_info.bufsize = oops_data_sz;
 
+	spin_lock_init(&nvram_pstore_info.buf_lock);
+
 	rc = pstore_register(&nvram_pstore_info);
 	if (rc != 0)
 		pr_err("nvram: pstore_register() failed, defaults to "