[PATCH 3/6] powerpc: fadump: use lock guard for mutex

[Shrikanth Hegde <sshegde@linux.ibm.com>]

use guard(mutex) for scope based resource management of mutex.
This would make the code simpler and easier to maintain.

More details on lock guards can be found at
https://lore.kernel.org/all/20230612093537.614161713@infradead.org/T/#u

Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
---
 arch/powerpc/kernel/fadump.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 4b371c738213..5fd2c546fd8c 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -1374,15 +1374,13 @@ static void fadump_free_elfcorehdr_buf(void)
 
 static void fadump_invalidate_release_mem(void)
 {
-	mutex_lock(&fadump_mutex);
+	guard(mutex)(&fadump_mutex);
+
 	if (!fw_dump.dump_active) {
-		mutex_unlock(&fadump_mutex);
 		return;
 	}
 
 	fadump_cleanup();
-	mutex_unlock(&fadump_mutex);
-
 	fadump_free_elfcorehdr_buf();
 	fadump_release_memory(fw_dump.boot_mem_top, memblock_end_of_DRAM());
 	fadump_free_cpu_notes_buf();
-- 
2.39.3