[PATCH 1/3] drm/msm/dp: Fix indentation kbot warnings in DP driver

[PATCH 1/3] drm/msm/dp: Fix indentation kbot warnings in DP driver

[Abhinav Kumar]

Fix a couple of indentation warnings reported by
kbot across MSM DP driver:

New smatch warnings:
drivers/gpu/drm/msm/dp/dp_debug.c:229 dp_test_data_show()
warn: inconsistent indenting

drivers/gpu/drm/msm/dp/dp_power.c:203 dp_power_clk_enable()
warn: inconsistent indenting

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_debug.c | 2 +-
 drivers/gpu/drm/msm/dp/dp_power.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c b/drivers/gpu/drm/msm/dp/dp_debug.c
index 84670bc..6c6998f 100644
--- a/drivers/gpu/drm/msm/dp/dp_debug.c
+++ b/drivers/gpu/drm/msm/dp/dp_debug.c
@@ -226,7 +226,7 @@ static int dp_test_data_show(struct seq_file *m, void *data)
 					debug->link->test_video.test_h_width);
 			seq_printf(m, "vdisplay: %d\n",
 					debug->link->test_video.test_v_height);
-					seq_printf(m, "bpc: %u\n",
+			seq_printf(m, "bpc: %u\n",
 					dp_link_bit_depth_to_bpc(bpc));
 		} else
 			seq_puts(m, "0");
diff --git a/drivers/gpu/drm/msm/dp/dp_power.c b/drivers/gpu/drm/msm/dp/dp_power.c
index 9c4ea00..3961ba4 100644
--- a/drivers/gpu/drm/msm/dp/dp_power.c
+++ b/drivers/gpu/drm/msm/dp/dp_power.c
@@ -269,7 +269,7 @@ int dp_power_clk_enable(struct dp_power *dp_power,
 		DRM_ERROR("failed to '%s' clks for: %s. err=%d\n",
 			enable ? "enable" : "disable",
 			dp_parser_pm_name(pm_type), rc);
-			return rc;
+		return rc;
 	}
 
 	if (pm_type == DP_CORE_PM)
-- 
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a Linux Foundation Collaborative Project

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[PATCH 2/3] drm/msm/dp: Fix incorrect NULL check kbot warnings in DP driver

[Abhinav Kumar]

Fix an incorrect NULL check reported by kbot in the MSM DP driver

smatch warnings:
drivers/gpu/drm/msm/dp/dp_hpd.c:37 dp_hpd_connect()
error: we previously assumed 'hpd_priv->dp_cb' could be null
(see line 37)

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_hpd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_hpd.c b/drivers/gpu/drm/msm/dp/dp_hpd.c
index 5b8fe3202..e1c90fa 100644
--- a/drivers/gpu/drm/msm/dp/dp_hpd.c
+++ b/drivers/gpu/drm/msm/dp/dp_hpd.c
@@ -34,8 +34,8 @@ int dp_hpd_connect(struct dp_usbpd *dp_usbpd, bool hpd)
 
 	dp_usbpd->hpd_high = hpd;
 
-	if (!hpd_priv->dp_cb && !hpd_priv->dp_cb->configure
-				&& !hpd_priv->dp_cb->disconnect) {
+	if (!hpd_priv->dp_cb || !hpd_priv->dp_cb->configure
+				|| !hpd_priv->dp_cb->disconnect) {
 		pr_err("hpd dp_cb not initialized\n");
 		return -EINVAL;
 	}
-- 
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a Linux Foundation Collaborative Project

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Re: [PATCH 2/3] drm/msm/dp: Fix incorrect NULL check kbot warnings in DP driver

[Stephen Boyd]

Quoting Abhinav Kumar (2021-03-05 11:17:18)
> Fix an incorrect NULL check reported by kbot in the MSM DP driver
> 
> smatch warnings:
> drivers/gpu/drm/msm/dp/dp_hpd.c:37 dp_hpd_connect()
> error: we previously assumed 'hpd_priv->dp_cb' could be null
> (see line 37)
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
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[PATCH 3/3] drm/msm/dp: delete unnecessary debugfs error handling

[Abhinav Kumar]

Currently the error checking logic in the dp_debug module could
pass zero to PTR_ERR and it causes the below kbot warnings:

drivers/gpu/drm/msm/dp/dp_debug.c:378 dp_debug_init()
warn: passing zero to 'PTR_ERR'
drivers/gpu/drm/msm/dp/dp_debug.c:387 dp_debug_init()
warn: passing zero to 'PTR_ERR'
drivers/gpu/drm/msm/dp/dp_debug.c:396 dp_debug_init()
warn: passing zero to 'PTR_ERR'
drivers/gpu/drm/msm/dp/dp_debug.c:405 dp_debug_init()
warn: passing zero to 'PTR_ERR'

Debugfs functions are not supposed to be checked in the normal
case so delete this code.  Also it silences the above Smatch
warnings that we're checking for NULL when these functions only
return error pointers.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_debug.c | 31 ++++---------------------------
 1 file changed, 4 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c b/drivers/gpu/drm/msm/dp/dp_debug.c
index 6c6998f..2f6247e 100644
--- a/drivers/gpu/drm/msm/dp/dp_debug.c
+++ b/drivers/gpu/drm/msm/dp/dp_debug.c
@@ -368,44 +368,21 @@ static int dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
 	int rc = 0;
 	struct dp_debug_private *debug = container_of(dp_debug,
 			struct dp_debug_private, dp_debug);
-	struct dentry *file;
-	struct dentry *test_active;
-	struct dentry *test_data, *test_type;
 
-	file = debugfs_create_file("dp_debug", 0444, minor->debugfs_root,
+	debugfs_create_file("dp_debug", 0444, minor->debugfs_root,
 			debug, &dp_debug_fops);
-	if (IS_ERR_OR_NULL(file)) {
-		rc = PTR_ERR(file);
-		DRM_ERROR("[%s] debugfs create file failed, rc=%d\n",
-				  DEBUG_NAME, rc);
-	}
 
-	test_active = debugfs_create_file("msm_dp_test_active", 0444,
+	debugfs_create_file("msm_dp_test_active", 0444,
 			minor->debugfs_root,
 			debug, &test_active_fops);
-	if (IS_ERR_OR_NULL(test_active)) {
-		rc = PTR_ERR(test_active);
-		DRM_ERROR("[%s] debugfs test_active failed, rc=%d\n",
-				  DEBUG_NAME, rc);
-	}
 
-	test_data = debugfs_create_file("msm_dp_test_data", 0444,
+	debugfs_create_file("msm_dp_test_data", 0444,
 			minor->debugfs_root,
 			debug, &dp_test_data_fops);
-	if (IS_ERR_OR_NULL(test_data)) {
-		rc = PTR_ERR(test_data);
-		DRM_ERROR("[%s] debugfs test_data failed, rc=%d\n",
-				  DEBUG_NAME, rc);
-	}
 
-	test_type = debugfs_create_file("msm_dp_test_type", 0444,
+	debugfs_create_file("msm_dp_test_type", 0444,
 			minor->debugfs_root,
 			debug, &dp_test_type_fops);
-	if (IS_ERR_OR_NULL(test_type)) {
-		rc = PTR_ERR(test_type);
-		DRM_ERROR("[%s] debugfs test_type failed, rc=%d\n",
-				  DEBUG_NAME, rc);
-	}
 
 	debug->root = minor->debugfs_root;
 
-- 
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a Linux Foundation Collaborative Project

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Re: [PATCH 3/3] drm/msm/dp: delete unnecessary debugfs error handling

[Stephen Boyd]

Quoting Abhinav Kumar (2021-03-05 11:17:19)
> Currently the error checking logic in the dp_debug module could
> pass zero to PTR_ERR and it causes the below kbot warnings:
> 
> drivers/gpu/drm/msm/dp/dp_debug.c:378 dp_debug_init()
> warn: passing zero to 'PTR_ERR'
> drivers/gpu/drm/msm/dp/dp_debug.c:387 dp_debug_init()
> warn: passing zero to 'PTR_ERR'
> drivers/gpu/drm/msm/dp/dp_debug.c:396 dp_debug_init()
> warn: passing zero to 'PTR_ERR'
> drivers/gpu/drm/msm/dp/dp_debug.c:405 dp_debug_init()
> warn: passing zero to 'PTR_ERR'
> 
> Debugfs functions are not supposed to be checked in the normal
> case so delete this code.  Also it silences the above Smatch
> warnings that we're checking for NULL when these functions only
> return error pointers.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@chromium.org>

Nice cleanup!
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Re: [PATCH 1/3] drm/msm/dp: Fix indentation kbot warnings in DP driver

[Stephen Boyd]

Quoting Abhinav Kumar (2021-03-05 11:17:17)
> Fix a couple of indentation warnings reported by
> kbot across MSM DP driver:
> 
> New smatch warnings:
> drivers/gpu/drm/msm/dp/dp_debug.c:229 dp_test_data_show()
> warn: inconsistent indenting
> 
> drivers/gpu/drm/msm/dp/dp_power.c:203 dp_power_clk_enable()
> warn: inconsistent indenting
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
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