linux-kernel - Re: [PATCH v7 2/8] firmware: add offset to request_firmware_into

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Message-ID: <20200609143445.GD19604@bombadil.infradead.org>
Date:   Tue, 9 Jun 2020 07:34:45 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Scott Branden <scott.branden@...adcom.com>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Wolfram Sang <wsa@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Brown <david.brown@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>, bjorn.andersson@...aro.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Olof Johansson <olof@...om.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Colin Ian King <colin.king@...onical.com>,
        Kees Cook <keescook@...omium.org>,
        Takashi Iwai <tiwai@...e.de>, linux-kselftest@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v7 2/8] firmware: add offset to request_firmware_into_buf

On Fri, Jun 05, 2020 at 10:04:52PM -0700, Scott Branden wrote:
>  static struct fw_priv *__allocate_fw_priv(const char *fw_name,
>  					  struct firmware_cache *fwc,
> -					  void *dbuf, size_t size)
> +					  void *dbuf, size_t size,
> +					  size_t offset,
> +					  enum kernel_pread_opt opt)
>  {

Your types are screwed up.  size_t is the size of something in memory.
loff_t is an offset in a file.  This should be an loff_t.  One of the
other patches has the opposite problem.

(this is kind of a minor problem compared to all the complexity
problems, but it's worth mentioning)