linux-kernel - Re: [PATCH] nvmem: fix nvmem_cell_get_from

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Message-ID: <CAMRc=Mdu1BZKA89OEjrB7Ti5nZujpO=_jk4EBaxjpESnFgZm1w@mail.gmail.com>
Date:   Tue, 2 Oct 2018 11:43:22 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     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>,
        Dan Carpenter <dan.carpenter@...cle.com>
Cc:     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] nvmem: fix nvmem_cell_get_from_lookup()

wt., 2 paź 2018 o 11:42 Bartosz Golaszewski <brgl@...ev.pl> napisał(a):
>
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> We check if the pointer returned by __nvmem_device_get() is not NULL
> while we should actually check if it is not IS_ERR(nvmem). Fix it.
>
> While we're at it: fix the next error path where we should assign an
> error value to cell before returning.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  drivers/nvmem/core.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index ad1227df1984..f49474e1ad49 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -952,9 +952,9 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
>                     (strcmp(lookup->con_id, con_id) == 0)) {
>                         /* This is the right entry. */
>                         nvmem = __nvmem_device_get(NULL, lookup->nvmem_name);
> -                       if (!nvmem) {
> +                       if (IS_ERR(nvmem)) {
>                                 /* Provider may not be registered yet. */
> -                               cell = ERR_PTR(-EPROBE_DEFER);
> +                               cell = ERR_CAST(nvmem);
>                                 goto out;
>                         }
>
> @@ -962,6 +962,7 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
>                                                        lookup->cell_name);
>                         if (!cell) {
>                                 __nvmem_device_put(nvmem);
> +                               cell = ERR_PTR(-ENOENT);
>                                 goto out;
>                         }
>                 }
> --
> 2.19.0
>

Ugh this was supposed to be v2. Sorry for spamming.

Bart