linux-kernel - [PATCH] drm/imagination: Free pvr_vm

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Message-ID: <9f26a943-1573-43a6-a919-d6425d9df34e@imgtec.com>
Date: Wed, 28 Aug 2024 13:13:45 +0000
From: Matt Coster <Matt.Coster@...tec.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard
	<mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie
	<airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Frank Binns <Frank.Binns@...tec.com>
Subject: [PATCH] drm/imagination: Free pvr_vm_gpuva after unlink

This caused a measurable memory leak. Although the individual
allocations are small, the leaks occurs in a high-usage codepath
(remapping or unmapping device memory) so they add up quickly.

Signed-off-by: Matt Coster <matt.coster@...tec.com>
Fixes: ff5f643de0bf ("drm/imagination: Add GEM and VM related code")
Cc: stable@...r.kernel.org
---
  drivers/gpu/drm/imagination/pvr_vm.c | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/imagination/pvr_vm.c 
b/drivers/gpu/drm/imagination/pvr_vm.c
index e59517ba039e..97c0f772ed65 100644
--- a/drivers/gpu/drm/imagination/pvr_vm.c
+++ b/drivers/gpu/drm/imagination/pvr_vm.c
@@ -114,6 +114,8 @@ struct pvr_vm_gpuva {
  	struct drm_gpuva base;
  };
  +#define to_pvr_vm_gpuva(va) container_of_const(va, struct 
pvr_vm_gpuva, base)
+
  enum pvr_vm_bind_type {
  	PVR_VM_BIND_TYPE_MAP,
  	PVR_VM_BIND_TYPE_UNMAP,
@@ -386,6 +388,7 @@ pvr_vm_gpuva_unmap(struct drm_gpuva_op *op, void 
*op_ctx)
   	drm_gpuva_unmap(&op->unmap);
  	drm_gpuva_unlink(op->unmap.va);
+	kfree(to_pvr_vm_gpuva(op->unmap.va));
   	return 0;
  }
@@ -433,6 +436,7 @@ pvr_vm_gpuva_remap(struct drm_gpuva_op *op, void 
*op_ctx)
  	}
   	drm_gpuva_unlink(op->remap.unmap->va);
+	kfree(to_pvr_vm_gpuva(op->remap.unmap->va));
   	return 0;
  }
-- 
2.46.0



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