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

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Message-ID: <20250314054544.1998928-4-sshegde@linux.ibm.com>
Date: Fri, 14 Mar 2025 11:15:41 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: maddy@...ux.ibm.com, linuxppc-dev@...ts.ozlabs.org
Cc: sshegde@...ux.ibm.com, npiggin@...il.com, christophe.leroy@...roup.eu,
        mpe@...erman.id.au, peterz@...radead.org, fbarrat@...ux.ibm.com,
        ajd@...ux.ibm.com, mahesh@...ux.ibm.com, oohall@...il.com,
        hbathini@...ux.ibm.com, dhowells@...hat.com, haren@...ux.ibm.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/6] powerpc: fadump: use lock guard for mutex

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@...ux.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