Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 16 Dec 2022 21:37:47 +0530
From:   Deepak R Varma <drv@mailo.com>
To:     Zhenyu Wang <zhenyuw@linux.intel.com>,
        Zhi Wang <zhi.a.wang@intel.com>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        intel-gvt-dev@lists.freedesktop.org,
        intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org
Cc:     Saurabh Singh Sengar <ssengar@microsoft.com>,
        Praveen Kumar <kumarpraveen@linux.microsoft.com>, drv@mailo.com
Subject: [PATCH] drm/i915/gvt: Replace DEFINE_SIMPLE_ATTRIBUTE by
 DEFINE_DEBUGFS_ATTRIBUTE
Message-ID: <Y5yX01RC4B22j5w8@qemulion>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Precedence: bulk

The DEFINE_DEBUGFS_ATTRIBUTE macro has implementation for protecting the
read/write file operations from removal race conditions. This further
enables using debugfs_create_file_unsafe() function since there is no need
for a proxy file operations struct for protection. Hence replace the
DEFINE_SIMPLE_ATTRIBUTE macro by DEFINE_DEBUGFS_ATTRIBUTE and the
debugfs_create_file() by the lightweight debugfs_create_file_unsafe()
versions.

This issue was identified using the coccinelle debugfs_simple_attr.cocci
semantic patch.

Signed-off-by: Deepak R Varma <drv@mailo.com>
---
Please note: The changes are compile tested only.

 drivers/gpu/drm/i915/gvt/debugfs.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/debugfs.c b/drivers/gpu/drm/i915/gvt/debugfs.c
index 9f1c209d9251..a45a43c35a6b 100644
--- a/drivers/gpu/drm/i915/gvt/debugfs.c
+++ b/drivers/gpu/drm/i915/gvt/debugfs.c
@@ -147,9 +147,9 @@ vgpu_scan_nonprivbb_set(void *data, u64 val)
 	return 0;
 }

-DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
-			vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
-			"0x%llx\n");
+DEFINE_DEBUGFS_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
+			 vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
+			 "0x%llx\n");

 /**
  * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
@@ -165,8 +165,8 @@ void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
 	debugfs_create_bool("active", 0444, vgpu->debugfs, &vgpu->active);
 	debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu,
 			    &vgpu_mmio_diff_fops);
-	debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
-			    &vgpu_scan_nonprivbb_fops);
+	debugfs_create_file_unsafe("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
+				   &vgpu_scan_nonprivbb_fops);
 }

 /**
--
2.34.1