drivers/phy/tegra/phy-tegra194-p2u.c:95:1-3: WARNING: PTR_ERR_OR_ZERO can be used

drivers/phy/tegra/phy-tegra194-p2u.c:95:1-3: WARNING: PTR_ERR_OR_ZERO can be used

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   09162bc32c880a791c6c0668ce0745cf7958f576
commit: 133552bf03edbe3892767a4b64c56e3bed746374 phy: Remove CONFIG_ARCH_* check for related subdir in Makefile
date:   5 months ago
config: h8300-randconfig-c004-20201116 (attached as .config)
compiler: h8300-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


"coccinelle warnings: (new ones prefixed by >>)"
>> drivers/phy/tegra/phy-tegra194-p2u.c:95:1-3: WARNING: PTR_ERR_OR_ZERO can be used

Please review and possibly fold the followup patch.

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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[PATCH] phy: fix ptr_ret.cocci warnings

[kernel test robot]

From: kernel test robot <lkp@intel.com>

drivers/phy/tegra/phy-tegra194-p2u.c:95:1-3: WARNING: PTR_ERR_OR_ZERO can be used


 Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR

Generated by: scripts/coccinelle/api/ptr_ret.cocci

Fixes: 133552bf03ed ("phy: Remove CONFIG_ARCH_* check for related subdir in Makefile")
CC: Tiezhu Yang <yangtiezhu@loongson.cn>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
---

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   09162bc32c880a791c6c0668ce0745cf7958f576
commit: 133552bf03edbe3892767a4b64c56e3bed746374 phy: Remove CONFIG_ARCH_* check for related subdir in Makefile

 phy-tegra194-p2u.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/phy/tegra/phy-tegra194-p2u.c
+++ b/drivers/phy/tegra/phy-tegra194-p2u.c
@@ -92,10 +92,7 @@ static int tegra_p2u_probe(struct platfo
 	phy_set_drvdata(generic_phy, phy);
 
 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
-	if (IS_ERR(phy_provider))
-		return PTR_ERR(phy_provider);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(phy_provider);
 }
 
 static const struct of_device_id tegra_p2u_id_table[] = {

Re: [PATCH] phy: fix ptr_ret.cocci warnings

[Thierry Reding]

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On Tue, Nov 17, 2020 at 07:00:32AM +0800, kernel test robot wrote:
> From: kernel test robot <lkp@intel.com>
> 
> drivers/phy/tegra/phy-tegra194-p2u.c:95:1-3: WARNING: PTR_ERR_OR_ZERO can be used
> 
> 
>  Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
> 
> Generated by: scripts/coccinelle/api/ptr_ret.cocci
> 
> Fixes: 133552bf03ed ("phy: Remove CONFIG_ARCH_* check for related subdir in Makefile")
> CC: Tiezhu Yang <yangtiezhu@loongson.cn>
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: kernel test robot <lkp@intel.com>
> ---
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   09162bc32c880a791c6c0668ce0745cf7958f576
> commit: 133552bf03edbe3892767a4b64c56e3bed746374 phy: Remove CONFIG_ARCH_* check for related subdir in Makefile
> 
>  phy-tegra194-p2u.c |    5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)

A similar patch was recently sent out against the pci-tegra driver. That
was perhaps the third time or so that it happened and both the Bjorn
(the PCI maintainer) and I have agreed multiple times in the past that
this isn't an actual improvement.

There are two reasons why I think this is actually worse than the
original: 1) this doesn't look like regular error handling and therefore
becomes more difficult to read and 2) if we ever need to add code
between the devm_of_phy_provider_register() and the final successful
return, we need to go and effectively revert this patch again.

I wonder if there's enough consensus that PTR_ERR_OR_ZERO() is really
that useful.

Thierry

> 
> --- a/drivers/phy/tegra/phy-tegra194-p2u.c
> +++ b/drivers/phy/tegra/phy-tegra194-p2u.c
> @@ -92,10 +92,7 @@ static int tegra_p2u_probe(struct platfo
>  	phy_set_drvdata(generic_phy, phy);
>  
>  	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> -	if (IS_ERR(phy_provider))
> -		return PTR_ERR(phy_provider);
> -
> -	return 0;
> +	return PTR_ERR_OR_ZERO(phy_provider);
>  }
>  
>  static const struct of_device_id tegra_p2u_id_table[] = {

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