[PATCH] drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[PATCH] drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Nathan Chancellor]

Clang warns:

drivers/gpu/drm/i915/display/intel_combo_phy.c:268:3: warning: variable
'ret' is uninitialized when used here [-Wuninitialized]
                ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),
                ^~~
drivers/gpu/drm/i915/display/intel_combo_phy.c:261:10: note: initialize
the variable 'ret' to silence this warning
        bool ret;
                ^
                 = 0
1 warning generated.

In practice, the bug this warning appears to be concerned with would not
actually matter because ret gets initialized to the return value of
cnl_verify_procmon_ref_values. However, that does appear to be a bug
since it means the first hunk of the patch this fixes won't actually do
anything (since the values of check_phy_reg won't factor into the final
ret value). Initialize ret to true then make all of the assignments a
bitwise AND with itself so that the function always does what it should
do.

Fixes: 239bef676d8e ("drm/i915/display: Implement new combo phy initialization step")
Link: https://github.com/ClangBuiltLinux/linux/issues/1094
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 drivers/gpu/drm/i915/display/intel_combo_phy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
index eccaa79cb4a9..a4b8aa6d0a9e 100644
--- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
@@ -258,7 +258,7 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
 static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
 				       enum phy phy)
 {
-	bool ret;
+	bool ret = true;
 	u32 expected_val = 0;
 
 	if (!icl_combo_phy_enabled(dev_priv, phy))
@@ -276,7 +276,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
 				     DCC_MODE_SELECT_CONTINUOSLY);
 	}
 
-	ret = cnl_verify_procmon_ref_values(dev_priv, phy);
+	ret &= cnl_verify_procmon_ref_values(dev_priv, phy);
 
 	if (phy_is_master(dev_priv, phy)) {
 		ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),

base-commit: ca0e494af5edb59002665bf12871e94b4163a257
-- 
2.28.0.rc0

[PATCH] drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Nathan Chancellor]

Clang warns:

drivers/gpu/drm/i915/display/intel_combo_phy.c:268:3: warning: variable
'ret' is uninitialized when used here [-Wuninitialized]
                ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),
                ^~~
drivers/gpu/drm/i915/display/intel_combo_phy.c:261:10: note: initialize
the variable 'ret' to silence this warning
        bool ret;
                ^
                 = 0
1 warning generated.

In practice, the bug this warning appears to be concerned with would not
actually matter because ret gets initialized to the return value of
cnl_verify_procmon_ref_values. However, that does appear to be a bug
since it means the first hunk of the patch this fixes won't actually do
anything (since the values of check_phy_reg won't factor into the final
ret value). Initialize ret to true then make all of the assignments a
bitwise AND with itself so that the function always does what it should
do.

Fixes: 239bef676d8e ("drm/i915/display: Implement new combo phy initialization step")
Link: https://github.com/ClangBuiltLinux/linux/issues/1094
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 drivers/gpu/drm/i915/display/intel_combo_phy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
index eccaa79cb4a9..a4b8aa6d0a9e 100644
--- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
@@ -258,7 +258,7 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
 static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
 				       enum phy phy)
 {
-	bool ret;
+	bool ret = true;
 	u32 expected_val = 0;
 
 	if (!icl_combo_phy_enabled(dev_priv, phy))
@@ -276,7 +276,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
 				     DCC_MODE_SELECT_CONTINUOSLY);
 	}
 
-	ret = cnl_verify_procmon_ref_values(dev_priv, phy);
+	ret &= cnl_verify_procmon_ref_values(dev_priv, phy);
 
 	if (phy_is_master(dev_priv, phy)) {
 		ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),

base-commit: ca0e494af5edb59002665bf12871e94b4163a257
-- 
2.28.0.rc0

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dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[Intel-gfx] [PATCH] drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Nathan Chancellor]

Clang warns:

drivers/gpu/drm/i915/display/intel_combo_phy.c:268:3: warning: variable
'ret' is uninitialized when used here [-Wuninitialized]
                ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),
                ^~~
drivers/gpu/drm/i915/display/intel_combo_phy.c:261:10: note: initialize
the variable 'ret' to silence this warning
        bool ret;
                ^
                 = 0
1 warning generated.

In practice, the bug this warning appears to be concerned with would not
actually matter because ret gets initialized to the return value of
cnl_verify_procmon_ref_values. However, that does appear to be a bug
since it means the first hunk of the patch this fixes won't actually do
anything (since the values of check_phy_reg won't factor into the final
ret value). Initialize ret to true then make all of the assignments a
bitwise AND with itself so that the function always does what it should
do.

Fixes: 239bef676d8e ("drm/i915/display: Implement new combo phy initialization step")
Link: https://github.com/ClangBuiltLinux/linux/issues/1094
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 drivers/gpu/drm/i915/display/intel_combo_phy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
index eccaa79cb4a9..a4b8aa6d0a9e 100644
--- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
@@ -258,7 +258,7 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
 static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
 				       enum phy phy)
 {
-	bool ret;
+	bool ret = true;
 	u32 expected_val = 0;
 
 	if (!icl_combo_phy_enabled(dev_priv, phy))
@@ -276,7 +276,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
 				     DCC_MODE_SELECT_CONTINUOSLY);
 	}
 
-	ret = cnl_verify_procmon_ref_values(dev_priv, phy);
+	ret &= cnl_verify_procmon_ref_values(dev_priv, phy);
 
 	if (phy_is_master(dev_priv, phy)) {
 		ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),

base-commit: ca0e494af5edb59002665bf12871e94b4163a257
-- 
2.28.0.rc0

_______________________________________________
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https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Patchwork]

== Series Details ==

Series: drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state
URL   : https://patchwork.freedesktop.org/series/79536/
State : warning

== Summary ==

$ dim checkpatch origin/drm-tip
b0efac00fd8c drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state
-:11: WARNING:COMMIT_LOG_LONG_LINE: Possible unwrapped commit description (prefer a maximum 75 chars per line)
#11: 
                ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),

total: 0 errors, 1 warnings, 0 checks, 16 lines checked


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[Intel-gfx] ✗ Fi.CI.BAT: failure for drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Patchwork]

[-- Attachment #1.1: Type: text/plain, Size: 8977 bytes --]

== Series Details ==

Series: drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state
URL   : https://patchwork.freedesktop.org/series/79536/
State : failure

== Summary ==

CI Bug Log - changes from CI_DRM_8753 -> Patchwork_18185
====================================================

Summary
-------

  **FAILURE**

  Serious unknown changes coming with Patchwork_18185 absolutely need to be
  verified manually.
  
  If you think the reported changes have nothing to do with the changes
  introduced in Patchwork_18185, please notify your bug team to allow them
  to document this new failure mode, which will reduce false positives in CI.

  External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/index.html

Possible new issues
-------------------

  Here are the unknown changes that may have been introduced in Patchwork_18185:

### IGT changes ###

#### Possible regressions ####

  * igt@i915_pm_rpm@module-reload:
    - fi-tgl-y:           [PASS][1] -> [DMESG-WARN][2] +4 similar issues
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-tgl-y/igt@i915_pm_rpm@module-reload.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-tgl-y/igt@i915_pm_rpm@module-reload.html

  
#### Suppressed ####

  The following results come from untrusted machines, tests, or statuses.
  They do not affect the overall result.

  * igt@i915_pm_rpm@basic-pci-d3-state:
    - {fi-tgl-dsi}:       [DMESG-WARN][3] ([i915#1982]) -> [DMESG-WARN][4]
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-tgl-dsi/igt@i915_pm_rpm@basic-pci-d3-state.html
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-tgl-dsi/igt@i915_pm_rpm@basic-pci-d3-state.html

  * igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a:
    - {fi-tgl-dsi}:       [PASS][5] -> [DMESG-WARN][6] +4 similar issues
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-tgl-dsi/igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a.html
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-tgl-dsi/igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a.html

  
Known issues
------------

  Here are the changes found in Patchwork_18185 that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@gem_exec_suspend@basic-s0:
    - fi-tgl-u2:          [PASS][7] -> [FAIL][8] ([i915#1888])
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-tgl-u2/igt@gem_exec_suspend@basic-s0.html
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-tgl-u2/igt@gem_exec_suspend@basic-s0.html

  * igt@kms_addfb_basic@bo-too-small:
    - fi-tgl-y:           [PASS][9] -> [DMESG-WARN][10] ([i915#402]) +1 similar issue
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-tgl-y/igt@kms_addfb_basic@bo-too-small.html
   [10]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-tgl-y/igt@kms_addfb_basic@bo-too-small.html

  
#### Possible fixes ####

  * igt@debugfs_test@read_all_entries:
    - fi-bsw-nick:        [INCOMPLETE][11] ([i915#1250] / [i915#1436]) -> [PASS][12]
   [11]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-bsw-nick/igt@debugfs_test@read_all_entries.html
   [12]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-bsw-nick/igt@debugfs_test@read_all_entries.html

  * igt@gem_exec_store@basic:
    - fi-tgl-y:           [DMESG-WARN][13] ([i915#402]) -> [PASS][14] +2 similar issues
   [13]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-tgl-y/igt@gem_exec_store@basic.html
   [14]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-tgl-y/igt@gem_exec_store@basic.html

  * igt@i915_module_load@reload:
    - fi-byt-j1900:       [DMESG-WARN][15] ([i915#1982]) -> [PASS][16]
   [15]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-byt-j1900/igt@i915_module_load@reload.html
   [16]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-byt-j1900/igt@i915_module_load@reload.html
    - fi-kbl-x1275:       [DMESG-WARN][17] ([i915#62] / [i915#92]) -> [PASS][18]
   [17]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-kbl-x1275/igt@i915_module_load@reload.html
   [18]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-kbl-x1275/igt@i915_module_load@reload.html

  * igt@i915_pm_rpm@basic-pci-d3-state:
    - fi-bsw-kefka:       [DMESG-WARN][19] ([i915#1982]) -> [PASS][20]
   [19]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-bsw-kefka/igt@i915_pm_rpm@basic-pci-d3-state.html
   [20]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-bsw-kefka/igt@i915_pm_rpm@basic-pci-d3-state.html

  * igt@i915_selftest@live@execlists:
    - fi-kbl-r:           [INCOMPLETE][21] ([i915#794]) -> [PASS][22]
   [21]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-kbl-r/igt@i915_selftest@live@execlists.html
   [22]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-kbl-r/igt@i915_selftest@live@execlists.html

  * igt@i915_selftest@live@gt_lrc:
    - fi-tgl-u2:          [DMESG-FAIL][23] ([i915#1233]) -> [PASS][24]
   [23]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-tgl-u2/igt@i915_selftest@live@gt_lrc.html
   [24]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-tgl-u2/igt@i915_selftest@live@gt_lrc.html

  * igt@kms_flip@basic-flip-vs-modeset@a-dsi1:
    - {fi-tgl-dsi}:       [DMESG-WARN][25] ([i915#1982]) -> [PASS][26]
   [25]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-tgl-dsi/igt@kms_flip@basic-flip-vs-modeset@a-dsi1.html
   [26]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-tgl-dsi/igt@kms_flip@basic-flip-vs-modeset@a-dsi1.html

  * igt@kms_pipe_crc_basic@read-crc-pipe-a-frame-sequence:
    - fi-tgl-u2:          [DMESG-WARN][27] ([i915#402]) -> [PASS][28]
   [27]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-tgl-u2/igt@kms_pipe_crc_basic@read-crc-pipe-a-frame-sequence.html
   [28]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-tgl-u2/igt@kms_pipe_crc_basic@read-crc-pipe-a-frame-sequence.html

  
#### Warnings ####

  * igt@gem_exec_suspend@basic-s0:
    - fi-kbl-x1275:       [DMESG-WARN][29] ([i915#62] / [i915#92]) -> [DMESG-WARN][30] ([i915#1982] / [i915#62] / [i915#92] / [i915#95])
   [29]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-kbl-x1275/igt@gem_exec_suspend@basic-s0.html
   [30]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-kbl-x1275/igt@gem_exec_suspend@basic-s0.html

  * igt@kms_flip@basic-flip-vs-dpms@a-dp1:
    - fi-kbl-x1275:       [DMESG-WARN][31] ([i915#62] / [i915#92] / [i915#95]) -> [DMESG-WARN][32] ([i915#62] / [i915#92])
   [31]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-kbl-x1275/igt@kms_flip@basic-flip-vs-dpms@a-dp1.html
   [32]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-kbl-x1275/igt@kms_flip@basic-flip-vs-dpms@a-dp1.html

  * igt@kms_force_connector_basic@force-edid:
    - fi-kbl-x1275:       [DMESG-WARN][33] ([i915#62] / [i915#92]) -> [DMESG-WARN][34] ([i915#62] / [i915#92] / [i915#95]) +4 similar issues
   [33]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8753/fi-kbl-x1275/igt@kms_force_connector_basic@force-edid.html
   [34]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/fi-kbl-x1275/igt@kms_force_connector_basic@force-edid.html

  
  {name}: This element is suppressed. This means it is ignored when computing
          the status of the difference (SUCCESS, WARNING, or FAILURE).

  [i915#1233]: https://gitlab.freedesktop.org/drm/intel/issues/1233
  [i915#1250]: https://gitlab.freedesktop.org/drm/intel/issues/1250
  [i915#1436]: https://gitlab.freedesktop.org/drm/intel/issues/1436
  [i915#1888]: https://gitlab.freedesktop.org/drm/intel/issues/1888
  [i915#1982]: https://gitlab.freedesktop.org/drm/intel/issues/1982
  [i915#2122]: https://gitlab.freedesktop.org/drm/intel/issues/2122
  [i915#402]: https://gitlab.freedesktop.org/drm/intel/issues/402
  [i915#62]: https://gitlab.freedesktop.org/drm/intel/issues/62
  [i915#794]: https://gitlab.freedesktop.org/drm/intel/issues/794
  [i915#92]: https://gitlab.freedesktop.org/drm/intel/issues/92
  [i915#95]: https://gitlab.freedesktop.org/drm/intel/issues/95


Participating hosts (46 -> 40)
------------------------------

  Missing    (6): fi-ilk-m540 fi-hsw-4200u fi-byt-squawks fi-bsw-cyan fi-byt-clapper fi-bdw-samus 


Build changes
-------------

  * Linux: CI_DRM_8753 -> Patchwork_18185

  CI-20190529: 20190529
  CI_DRM_8753: 62f01b776240c4586b3cbbdbe6065d4473d45429 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_5737: c18a9c1083ce9344ff71ae405b9f2deaa82b6702 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_18185: b0efac00fd8cdd3d7a3cc3140ba0df8bda56ebf3 @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

b0efac00fd8c drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/index.html

[-- Attachment #1.2: Type: text/html, Size: 11264 bytes --]

[-- Attachment #2: Type: text/plain, Size: 160 bytes --]

_______________________________________________
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Re: [PATCH] drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Matt Roper]

On Wed, Jul 15, 2020 at 09:27:42PM -0700, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/gpu/drm/i915/display/intel_combo_phy.c:268:3: warning: variable
> 'ret' is uninitialized when used here [-Wuninitialized]
>                 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),
>                 ^~~
> drivers/gpu/drm/i915/display/intel_combo_phy.c:261:10: note: initialize
> the variable 'ret' to silence this warning
>         bool ret;
>                 ^
>                  = 0
> 1 warning generated.
> 
> In practice, the bug this warning appears to be concerned with would not
> actually matter because ret gets initialized to the return value of
> cnl_verify_procmon_ref_values. However, that does appear to be a bug
> since it means the first hunk of the patch this fixes won't actually do
> anything (since the values of check_phy_reg won't factor into the final
> ret value). Initialize ret to true then make all of the assignments a
> bitwise AND with itself so that the function always does what it should
> do.
> 
> Fixes: 239bef676d8e ("drm/i915/display: Implement new combo phy initialization step")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1094
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_combo_phy.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
> index eccaa79cb4a9..a4b8aa6d0a9e 100644
> --- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
> +++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
> @@ -258,7 +258,7 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
>  static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
>  				       enum phy phy)
>  {
> -	bool ret;
> +	bool ret = true;
>  	u32 expected_val = 0;
>  
>  	if (!icl_combo_phy_enabled(dev_priv, phy))
> @@ -276,7 +276,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
>  				     DCC_MODE_SELECT_CONTINUOSLY);
>  	}
>  
> -	ret = cnl_verify_procmon_ref_values(dev_priv, phy);
> +	ret &= cnl_verify_procmon_ref_values(dev_priv, phy);
>  
>  	if (phy_is_master(dev_priv, phy)) {
>  		ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),
> 
> base-commit: ca0e494af5edb59002665bf12871e94b4163a257
> -- 
> 2.28.0.rc0
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795

Re: [PATCH] drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Matt Roper]

On Wed, Jul 15, 2020 at 09:27:42PM -0700, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/gpu/drm/i915/display/intel_combo_phy.c:268:3: warning: variable
> 'ret' is uninitialized when used here [-Wuninitialized]
>                 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),
>                 ^~~
> drivers/gpu/drm/i915/display/intel_combo_phy.c:261:10: note: initialize
> the variable 'ret' to silence this warning
>         bool ret;
>                 ^
>                  = 0
> 1 warning generated.
> 
> In practice, the bug this warning appears to be concerned with would not
> actually matter because ret gets initialized to the return value of
> cnl_verify_procmon_ref_values. However, that does appear to be a bug
> since it means the first hunk of the patch this fixes won't actually do
> anything (since the values of check_phy_reg won't factor into the final
> ret value). Initialize ret to true then make all of the assignments a
> bitwise AND with itself so that the function always does what it should
> do.
> 
> Fixes: 239bef676d8e ("drm/i915/display: Implement new combo phy initialization step")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1094
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_combo_phy.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
> index eccaa79cb4a9..a4b8aa6d0a9e 100644
> --- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
> +++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
> @@ -258,7 +258,7 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
>  static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
>  				       enum phy phy)
>  {
> -	bool ret;
> +	bool ret = true;
>  	u32 expected_val = 0;
>  
>  	if (!icl_combo_phy_enabled(dev_priv, phy))
> @@ -276,7 +276,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
>  				     DCC_MODE_SELECT_CONTINUOSLY);
>  	}
>  
> -	ret = cnl_verify_procmon_ref_values(dev_priv, phy);
> +	ret &= cnl_verify_procmon_ref_values(dev_priv, phy);
>  
>  	if (phy_is_master(dev_priv, phy)) {
>  		ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),
> 
> base-commit: ca0e494af5edb59002665bf12871e94b4163a257
> -- 
> 2.28.0.rc0
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [Intel-gfx] [PATCH] drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Matt Roper]

On Wed, Jul 15, 2020 at 09:27:42PM -0700, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/gpu/drm/i915/display/intel_combo_phy.c:268:3: warning: variable
> 'ret' is uninitialized when used here [-Wuninitialized]
>                 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),
>                 ^~~
> drivers/gpu/drm/i915/display/intel_combo_phy.c:261:10: note: initialize
> the variable 'ret' to silence this warning
>         bool ret;
>                 ^
>                  = 0
> 1 warning generated.
> 
> In practice, the bug this warning appears to be concerned with would not
> actually matter because ret gets initialized to the return value of
> cnl_verify_procmon_ref_values. However, that does appear to be a bug
> since it means the first hunk of the patch this fixes won't actually do
> anything (since the values of check_phy_reg won't factor into the final
> ret value). Initialize ret to true then make all of the assignments a
> bitwise AND with itself so that the function always does what it should
> do.
> 
> Fixes: 239bef676d8e ("drm/i915/display: Implement new combo phy initialization step")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1094
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_combo_phy.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
> index eccaa79cb4a9..a4b8aa6d0a9e 100644
> --- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
> +++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
> @@ -258,7 +258,7 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
>  static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
>  				       enum phy phy)
>  {
> -	bool ret;
> +	bool ret = true;
>  	u32 expected_val = 0;
>  
>  	if (!icl_combo_phy_enabled(dev_priv, phy))
> @@ -276,7 +276,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
>  				     DCC_MODE_SELECT_CONTINUOSLY);
>  	}
>  
> -	ret = cnl_verify_procmon_ref_values(dev_priv, phy);
> +	ret &= cnl_verify_procmon_ref_values(dev_priv, phy);
>  
>  	if (phy_is_master(dev_priv, phy)) {
>  		ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),
> 
> base-commit: ca0e494af5edb59002665bf12871e94b4163a257
> -- 
> 2.28.0.rc0
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] ✗ Fi.CI.BAT: failure for drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Souza, Jose]

Hi Nathan

Are you planning to check this regressions and send another version with the fix?Or can I do it on top of your patch?

On Thu, 2020-07-16 at 05:06 +0000, Patchwork wrote:
> Patch Details
> Series:	drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state
> URL:	https://patchwork.freedesktop.org/series/79536/
> State:	failure
> Details:	https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/index.html
> CI Bug Log - changes from CI_DRM_8753 -> Patchwork_18185
> Summary
> FAILURE
> 
> Serious unknown changes coming with Patchwork_18185 absolutely need to be
> verified manually.
> 
> If you think the reported changes have nothing to do with the changes
> introduced in Patchwork_18185, please notify your bug team to allow them
> to document this new failure mode, which will reduce false positives in CI.
> 
> External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/index.html
> 
> Possible new issues
> Here are the unknown changes that may have been introduced in Patchwork_18185:
> 
> IGT changes
> Possible regressions
> igt@i915_pm_rpm@module-reload:
> fi-tgl-y: PASS -> DMESG-WARN +4 similar issues
> Suppressed
> The following results come from untrusted machines, tests, or statuses.
> They do not affect the overall result.
> 
> igt@i915_pm_rpm@basic-pci-d3-state:
> 
> {fi-tgl-dsi}: DMESG-WARN (i915#1982) -> DMESG-WARN
> igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a:
> 
> {fi-tgl-dsi}: PASS -> DMESG-WARN +4 similar issues
> Known issues
> Here are the changes found in Patchwork_18185 that come from known issues:
> 
> IGT changes
> Issues hit
> igt@gem_exec_suspend@basic-s0:
> 
> fi-tgl-u2: PASS -> FAIL (i915#1888)
> igt@kms_addfb_basic@bo-too-small:
> 
> fi-tgl-y: PASS -> DMESG-WARN (i915#402) +1 similar issue
> Possible fixes
> igt@debugfs_test@read_all_entries:
> 
> fi-bsw-nick: INCOMPLETE (i915#1250 / i915#1436) -> PASS
> igt@gem_exec_store@basic:
> 
> fi-tgl-y: DMESG-WARN (i915#402) -> PASS +2 similar issues
> igt@i915_module_load@reload:
> 
> fi-byt-j1900: DMESG-WARN (i915#1982) -> PASS
> 
> fi-kbl-x1275: DMESG-WARN (i915#62 / i915#92) -> PASS
> 
> igt@i915_pm_rpm@basic-pci-d3-state:
> 
> fi-bsw-kefka: DMESG-WARN (i915#1982) -> PASS
> igt@i915_selftest@live@execlists:
> 
> fi-kbl-r: INCOMPLETE (i915#794) -> PASS
> igt@i915_selftest@live@gt_lrc:
> 
> fi-tgl-u2: DMESG-FAIL (i915#1233) -> PASS
> igt@kms_flip@basic-flip-vs-modeset@a-dsi1:
> 
> {fi-tgl-dsi}: DMESG-WARN (i915#1982) -> PASS
> igt@kms_pipe_crc_basic@read-crc-pipe-a-frame-sequence:
> 
> fi-tgl-u2: DMESG-WARN (i915#402) -> PASS
> Warnings
> igt@gem_exec_suspend@basic-s0:
> 
> fi-kbl-x1275: DMESG-WARN (i915#62 / i915#92) -> DMESG-WARN (i915#1982 / i915#62 / i915#92 / i915#95)
> igt@kms_flip@basic-flip-vs-dpms@a-dp1:
> 
> fi-kbl-x1275: DMESG-WARN (i915#62 / i915#92 / i915#95) -> DMESG-WARN (i915#62 / i915#92)
> igt@kms_force_connector_basic@force-edid:
> 
> fi-kbl-x1275: DMESG-WARN (i915#62 / i915#92) -> DMESG-WARN (i915#62 / i915#92 / i915#95) +4 similar issues
> {name}: This element is suppressed. This means it is ignored when computing
> the status of the difference (SUCCESS, WARNING, or FAILURE).
> 
> Participating hosts (46 -> 40)
> Missing (6): fi-ilk-m540 fi-hsw-4200u fi-byt-squawks fi-bsw-cyan fi-byt-clapper fi-bdw-samus 
> 
> Build changes
> Linux: CI_DRM_8753 -> Patchwork_18185
> CI-20190529: 20190529
> CI_DRM_8753: 62f01b776240c4586b3cbbdbe6065d4473d45429 @ git://anongit.freedesktop.org/gfx-ci/linux
> IGT_5737: c18a9c1083ce9344ff71ae405b9f2deaa82b6702 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
> Patchwork_18185: b0efac00fd8cdd3d7a3cc3140ba0df8bda56ebf3 @ git://anongit.freedesktop.org/gfx-ci/linux
> 
> == Linux commits ==
> 
> b0efac00fd8c drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> 
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> 
_______________________________________________
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Re: [Intel-gfx] ✗ Fi.CI.BAT: failure for drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

[Nathan Chancellor]

Hi Jose,

On Tue, Jul 28, 2020 at 01:47:56AM +0000, Souza, Jose wrote:
> Hi Nathan
> 
> Are you planning to check this regressions and send another version with the fix?Or can I do it on top of your patch?

Unfortunately, I have had little time for kernel work (full time retail
worker in the middle of a pandemic plus full time student is a real fun
combination...). I would definitely appreciate a follow up fix if you
can provide one, since I would imagine it would be a pre-existing issue
since all my patch does is make the check in the icl_combo_phy_enabled
if block work as expected (when it does not appear to be working
before).

Cheers,
Nathan

> On Thu, 2020-07-16 at 05:06 +0000, Patchwork wrote:
> > Patch Details
> > Series:	drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state
> > URL:	https://patchwork.freedesktop.org/series/79536/
> > State:	failure
> > Details:	https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/index.html
> > CI Bug Log - changes from CI_DRM_8753 -> Patchwork_18185
> > Summary
> > FAILURE
> > 
> > Serious unknown changes coming with Patchwork_18185 absolutely need to be
> > verified manually.
> > 
> > If you think the reported changes have nothing to do with the changes
> > introduced in Patchwork_18185, please notify your bug team to allow them
> > to document this new failure mode, which will reduce false positives in CI.
> > 
> > External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18185/index.html
> > 
> > Possible new issues
> > Here are the unknown changes that may have been introduced in Patchwork_18185:
> > 
> > IGT changes
> > Possible regressions
> > igt@i915_pm_rpm@module-reload:
> > fi-tgl-y: PASS -> DMESG-WARN +4 similar issues
> > Suppressed
> > The following results come from untrusted machines, tests, or statuses.
> > They do not affect the overall result.
> > 
> > igt@i915_pm_rpm@basic-pci-d3-state:
> > 
> > {fi-tgl-dsi}: DMESG-WARN (i915#1982) -> DMESG-WARN
> > igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a:
> > 
> > {fi-tgl-dsi}: PASS -> DMESG-WARN +4 similar issues
> > Known issues
> > Here are the changes found in Patchwork_18185 that come from known issues:
> > 
> > IGT changes
> > Issues hit
> > igt@gem_exec_suspend@basic-s0:
> > 
> > fi-tgl-u2: PASS -> FAIL (i915#1888)
> > igt@kms_addfb_basic@bo-too-small:
> > 
> > fi-tgl-y: PASS -> DMESG-WARN (i915#402) +1 similar issue
> > Possible fixes
> > igt@debugfs_test@read_all_entries:
> > 
> > fi-bsw-nick: INCOMPLETE (i915#1250 / i915#1436) -> PASS
> > igt@gem_exec_store@basic:
> > 
> > fi-tgl-y: DMESG-WARN (i915#402) -> PASS +2 similar issues
> > igt@i915_module_load@reload:
> > 
> > fi-byt-j1900: DMESG-WARN (i915#1982) -> PASS
> > 
> > fi-kbl-x1275: DMESG-WARN (i915#62 / i915#92) -> PASS
> > 
> > igt@i915_pm_rpm@basic-pci-d3-state:
> > 
> > fi-bsw-kefka: DMESG-WARN (i915#1982) -> PASS
> > igt@i915_selftest@live@execlists:
> > 
> > fi-kbl-r: INCOMPLETE (i915#794) -> PASS
> > igt@i915_selftest@live@gt_lrc:
> > 
> > fi-tgl-u2: DMESG-FAIL (i915#1233) -> PASS
> > igt@kms_flip@basic-flip-vs-modeset@a-dsi1:
> > 
> > {fi-tgl-dsi}: DMESG-WARN (i915#1982) -> PASS
> > igt@kms_pipe_crc_basic@read-crc-pipe-a-frame-sequence:
> > 
> > fi-tgl-u2: DMESG-WARN (i915#402) -> PASS
> > Warnings
> > igt@gem_exec_suspend@basic-s0:
> > 
> > fi-kbl-x1275: DMESG-WARN (i915#62 / i915#92) -> DMESG-WARN (i915#1982 / i915#62 / i915#92 / i915#95)
> > igt@kms_flip@basic-flip-vs-dpms@a-dp1:
> > 
> > fi-kbl-x1275: DMESG-WARN (i915#62 / i915#92 / i915#95) -> DMESG-WARN (i915#62 / i915#92)
> > igt@kms_force_connector_basic@force-edid:
> > 
> > fi-kbl-x1275: DMESG-WARN (i915#62 / i915#92) -> DMESG-WARN (i915#62 / i915#92 / i915#95) +4 similar issues
> > {name}: This element is suppressed. This means it is ignored when computing
> > the status of the difference (SUCCESS, WARNING, or FAILURE).
> > 
> > Participating hosts (46 -> 40)
> > Missing (6): fi-ilk-m540 fi-hsw-4200u fi-byt-squawks fi-bsw-cyan fi-byt-clapper fi-bdw-samus 
> > 
> > Build changes
> > Linux: CI_DRM_8753 -> Patchwork_18185
> > CI-20190529: 20190529
> > CI_DRM_8753: 62f01b776240c4586b3cbbdbe6065d4473d45429 @ git://anongit.freedesktop.org/gfx-ci/linux
> > IGT_5737: c18a9c1083ce9344ff71ae405b9f2deaa82b6702 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
> > Patchwork_18185: b0efac00fd8cdd3d7a3cc3140ba0df8bda56ebf3 @ git://anongit.freedesktop.org/gfx-ci/linux
> > 
> > == Linux commits ==
> > 
> > b0efac00fd8c drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > 
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > 
> > 
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