linux-kernel - [PATCH 09/10] drm/panthor: move size check to mmu_hw_flush

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Message-ID: <20250916210823.4033529-10-olvaffe@gmail.com>
Date: Tue, 16 Sep 2025 14:08:22 -0700
From: Chia-I Wu <olvaffe@...il.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Grant Likely <grant.likely@...aro.org>,
	Heiko Stuebner <heiko@...ech.de>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 09/10] drm/panthor: move size check to mmu_hw_flush_caches

We can early return from mmu_hw_flush_caches when size is 0.

Signed-off-by: Chia-I Wu <olvaffe@...il.com>
---
 drivers/gpu/drm/panthor/panthor_mmu.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c
index 436a54e30a36d..743e9342eece7 100644
--- a/drivers/gpu/drm/panthor/panthor_mmu.c
+++ b/drivers/gpu/drm/panthor/panthor_mmu.c
@@ -570,9 +570,6 @@ static void mmu_hw_cmd_lock(struct panthor_device *ptdev, u32 as_nr, u64 region_
 	u64 region;
 	u64 region_end = region_start + size;
 
-	if (!size)
-		return;
-
 	/*
 	 * The locked region is a naturally aligned power of 2 block encoded as
 	 * log2 minus(1).
@@ -643,7 +640,7 @@ static int mmu_hw_flush_caches(struct panthor_device *ptdev, int as_nr, u64 iova
 		return -EINVAL;
 	}
 
-	if (as_nr < 0)
+	if (as_nr < 0 || !size)
 		return 0;
 
 	/*
-- 
2.51.0.384.g4c02a37b29-goog