linux-kernel - [PATCH] drm/i915/gvt: use DEFINE_DEBUGFS_ATTRIBUTE with debugfs_create_file

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Date:   Fri, 30 Oct 2020 08:59:45 +0530
From:   Deepak R Varma <mh12gx2825@...il.com>
To:     outreachy-kernel@...glegroups.com,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     mh12gx2825@...il.com, melissa.srw@...il.com, daniel.vetter@...ll.ch
Subject: [PATCH] drm/i915/gvt: use DEFINE_DEBUGFS_ATTRIBUTE with
 debugfs_create_file_unsafe()

Using DEFINE_DEBUGFS_ATTRIBUTE macro with debugfs_create_file_unsafe()
function in place of the debugfs_create_file() function will make the
file operation struct "reset" aware of the file's lifetime. Additional
details here: https://lists.archive.carbon60.com/linux/kernel/2369498

Issue reported by Coccinelle script:
scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci

Signed-off-by: Deepak R Varma <mh12gx2825@...il.com>
---
Please Note: This is a Outreachy project task patch.

 drivers/gpu/drm/i915/gvt/debugfs.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/debugfs.c b/drivers/gpu/drm/i915/gvt/debugfs.c
index 62e6a14ad58e..18adfa2d5f5b 100644
--- a/drivers/gpu/drm/i915/gvt/debugfs.c
+++ b/drivers/gpu/drm/i915/gvt/debugfs.c
@@ -147,9 +147,8 @@ 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 +164,8 @@ 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);
 }
 
 /**
-- 
2.25.1