From 52fbba84d4533378181d9e130b247f94340cba48 Mon Sep 17 00:00:00 2001
From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Fri, 15 Oct 2021 16:17:02 -0700
Subject: drm/msm/dp: Move debugfs files into subdirectory
Git-commit: 3d18c34d84b4119fd42db3d68b79d1d3a6d53f0b
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

In the cleanup path of the MSM DP driver the DP driver's debugfs files
are destroyed by invoking debugfs_remove_recursive() on debug->root,
which during initialization has been set to minor->debugfs_root.

To allow cleaning up the DP driver's debugfs files either each dentry
needs to be kept track of or the files needs to be put in a subdirectory
which can be removed in one go.

By choosing to put the debugfs files in a subdirectory, based on the
name of the associated connector this also solves the problem that these
names would collide as support for multiple DP instances are introduced.

One alternative solution to the problem with colliding file names would
have been to put keep track of the individual files and put them under
the connector's debugfs directory. But while the drm_connector has been
allocated, its associated debugfs directory has not been created at the
time of initialization of the dp_debug.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Link: https://lore.kernel.org/r/20211015231702.1784254-1-bjorn.andersson@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/msm/dp/dp_debug.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c b/drivers/gpu/drm/msm/dp/dp_debug.c
index da4323556ef3..67da4c69eca1 100644
--- a/drivers/gpu/drm/msm/dp/dp_debug.c
+++ b/drivers/gpu/drm/msm/dp/dp_debug.c
@@ -210,26 +210,29 @@ static const struct file_operations test_active_fops = {
 static int dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
 {
 	int rc = 0;
+	char path[64];
 	struct dp_debug_private *debug = container_of(dp_debug,
 			struct dp_debug_private, dp_debug);
 
-	debugfs_create_file("dp_debug", 0444, minor->debugfs_root,
+	snprintf(path, sizeof(path), "msm_dp-%s", debug->connector->name);
+
+	debug->root = debugfs_create_dir(path, minor->debugfs_root);
+
+	debugfs_create_file("dp_debug", 0444, debug->root,
 			debug, &dp_debug_fops);
 
 	debugfs_create_file("msm_dp_test_active", 0444,
-			minor->debugfs_root,
+			debug->root,
 			debug, &test_active_fops);
 
 	debugfs_create_file("msm_dp_test_data", 0444,
-			minor->debugfs_root,
+			debug->root,
 			debug, &dp_test_data_fops);
 
 	debugfs_create_file("msm_dp_test_type", 0444,
-			minor->debugfs_root,
+			debug->root,
 			debug, &dp_test_type_fops);
 
-	debug->root = minor->debugfs_root;
-
 	return rc;
 }
 
-- 
2.38.1