[PATCH v5 1/4] powerpc/fadump: un-register fadump on kexec path.

[Mahesh J Salgaonkar]

From: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>

otherwise the fadump registration in new kexec-ed kernel complains that
fadump is already registered. This makes new kernel to continue using
fadump registered by previous kernel which may lead to invalid vmcore
generation. Hence this patch fixes this issue by un-registering fadump
in fadump_cleanup() which is called during kexec path so that new kernel
can register fadump with new valid values.

Signed-off-by: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>
---
 arch/powerpc/kernel/fadump.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 8ceabef40d3d..07e8396d472b 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -1180,6 +1180,9 @@ void fadump_cleanup(void)
 		init_fadump_mem_struct(&fdm,
 			be64_to_cpu(fdm_active->cpu_state_data.destination_address));
 		fadump_invalidate_dump(&fdm);
+	} else if (fw_dump.dump_registered) {
+		/* Un-register Firmware-assisted dump if it was registered. */
+		fadump_unregister_dump(&fdm);
 	}
 }