linux-kernel - Re: [PATCH v3 08/21] nvmem: sunxi_sid: use devm_nvmem

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Date:   Thu, 13 Sep 2018 10:39:48 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        David Lechner <david@...hnology.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>, Alban Bedel <albeu@...e.fr>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-doc <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v3 08/21] nvmem: sunxi_sid: use devm_nvmem_register()

2018-09-13 3:38 GMT+02:00 kbuild test robot <lkp@...el.com>:
> Hi Bartosz,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on v4.19-rc3 next-20180912]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/Bartosz-Golaszewski/nvmem-rework-of-the-subsystem-for-non-DT-users/20180913-071053
> config: arm-sunxi_defconfig (attached as .config)
> compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         GCC_VERSION=7.2.0 make.cross ARCH=arm
>
> All warnings (new ones prefixed by >>):
>
>    drivers/nvmem/sunxi_sid.c: In function 'sunxi_sid_probe':
>>> drivers/nvmem/sunxi_sid.c:190:18: warning: passing argument 1 of 'PTR_ERR' makes pointer from integer without a cast [-Wint-conversion]
>       return PTR_ERR(-EINVAL);
>                      ^
>    In file included from include/linux/kernfs.h:11:0,
>                     from include/linux/sysfs.h:16,
>                     from include/linux/kobject.h:20,
>                     from include/linux/device.h:16,
>                     from drivers/nvmem/sunxi_sid.c:18:
>    include/linux/err.h:29:33: note: expected 'const void *' but argument is of type 'int'
>     static inline long __must_check PTR_ERR(__force const void *ptr)
>                                     ^~~~~~~
>    drivers/nvmem/sunxi_sid.c:157:6: warning: unused variable 'ret' [-Wunused-variable]
>      int ret, i, size;
>          ^~~
>
> vim +/PTR_ERR +190 drivers/nvmem/sunxi_sid.c
>
>    150
>    151  static int sunxi_sid_probe(struct platform_device *pdev)
>    152  {
>    153          struct device *dev = &pdev->dev;
>    154          struct resource *res;
>    155          struct nvmem_device *nvmem;
>    156          struct sunxi_sid *sid;
>    157          int ret, i, size;
>    158          char *randomness;
>    159          const struct sunxi_sid_cfg *cfg;
>    160
>    161          sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);
>    162          if (!sid)
>    163                  return -ENOMEM;
>    164
>    165          cfg = of_device_get_match_data(dev);
>    166          if (!cfg)
>    167                  return -EINVAL;
>    168          sid->value_offset = cfg->value_offset;
>    169
>    170          res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>    171          sid->base = devm_ioremap_resource(dev, res);
>    172          if (IS_ERR(sid->base))
>    173                  return PTR_ERR(sid->base);
>    174
>    175          size = cfg->size;
>    176
>    177          econfig.size = size;
>    178          econfig.dev = dev;
>    179          if (cfg->need_register_readout)
>    180                  econfig.reg_read = sun8i_sid_read_by_reg;
>    181          else
>    182                  econfig.reg_read = sunxi_sid_read;
>    183          econfig.priv = sid;
>    184          nvmem = devm_nvmem_register(dev, &econfig);
>    185          if (IS_ERR(nvmem))
>    186                  return PTR_ERR(nvmem);
>    187
>    188          randomness = kzalloc(size, GFP_KERNEL);
>    189          if (!randomness)
>  > 190                  return PTR_ERR(-EINVAL);

Will fix in v4. I think this should also return -ENOMEM, not -EINVAL.

Bart

>    191
>    192          for (i = 0; i < size; i++)
>    193                  econfig.reg_read(sid, i, &randomness[i], 1);
>    194
>    195          add_device_randomness(randomness, size);
>    196          kfree(randomness);
>    197
>    198          platform_set_drvdata(pdev, nvmem);
>    199
>    200          return 0;
>    201  }
>    202
>
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation