[PATCH 5.10 186/406] powerpc/fadump: reset dump area size if fadump memory reserve fails

Greg Kroah-Hartman
2023-09-17T19:31:06Z

From: Sourabh Jain <sourabhjain@linux.ibm.com>

[ Upstream commit d1eb75e0dfed80d2d85b664e28a39f65b290ab55 ]

In case fadump_reserve_mem() fails to reserve memory, the
reserve_dump_area_size variable will retain the reserve area size. This
will lead to /sys/kernel/fadump/mem_reserved node displaying an incorrect
memory reserved by fadump.

To fix this problem, reserve dump area size variable is set to 0 if fadump
failed to reserve memory.

Fixes: 8255da95e545 ("powerpc/fadump: release all the memory above boot memory size")
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Acked-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230704050715.203581-1-sourabhjain@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/kernel/fadump.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 1a5ba26aab156..935ce1bec43fa 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -642,6 +642,7 @@ int __init fadump_reserve_mem(void)
return ret;
error_out:
fw_dump.fadump_enabled = 0;
+ fw_dump.reserve_dump_area_size = 0;
return 0;
}

--
2.40.1