From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: matthew.gerlach@linux.intel.com
Cc: hao.wu@intel.com, yilun.xu@intel.com, russell.h.weight@intel.com,
basheer.ahmed.muddebihal@intel.com, trix@redhat.com,
mdf@kernel.org, linux-fpga@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
tianfei.zhang@intel.com, corbet@lwn.net,
gregkh@linuxfoundation.org, linux-serial@vger.kernel.org,
jirislaby@kernel.org, geert+renesas@glider.be,
niklas.soderlund+renesas@ragnatech.se, macro@orcam.me.uk,
johan@kernel.org, lukas@wunner.de, ilpo.jarvinen@linux.intel.com,
marpagan@redhat.com, bagasdotme@gmail.com
Subject: Re: [PATCH v7 3/4] fpga: dfl: add basic support for DFHv1
Date: Tue, 20 Dec 2022 19:03:06 +0200 [thread overview]
Message-ID: <Y6HqyjFkiUDeNmH1@smile.fi.intel.com> (raw)
In-Reply-To: <20221220163652.499831-4-matthew.gerlach@linux.intel.com>
On Tue, Dec 20, 2022 at 08:36:51AM -0800, matthew.gerlach@linux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
>
> Version 1 of the Device Feature Header (DFH) definition adds
> functionality to the DFL bus.
>
> A DFHv1 header may have one or more parameter blocks that
> further describes the HW to SW. Add support to the DFL bus
> to parse the MSI-X parameter.
>
> The location of a feature's register set is explicitly
> described in DFHv1 and can be relative to the base of the DFHv1
> or an absolute address. Parse the location and pass the information
> to DFL driver.
...
> +/**
> + * dfh_find_param() - find data for the given parameter id
> + * @dfl_dev: dfl device
> + * @param: id of dfl parameter
> + *
> + * Return: pointer to parameter header on success, NULL otherwise.
header is a bit confusing here, does it mean we give and ID and we got
something more than just a data as summary above suggests?
In such case summary and this text should clarify what exactly we get
and layout of the data. Since this is a pointer, who is responsible of
checking out-of-boundary accesses? For instance, if the parameters are
variadic by length the length should be returned as well. Otherwise it
should be specified as a constant somewhere, right?
> + */
> +u64 *dfh_find_param(struct dfl_device *dfl_dev, int param_id)
> +{
> + return find_param(dfl_dev->params, dfl_dev->param_size, param_id);
> +}
> +EXPORT_SYMBOL_GPL(dfh_find_param);
...
> + finfo = kzalloc(sizeof(*finfo) + dfh_psize, GFP_KERNEL);
It sounds like a candidate for struct_size() from overflow.h.
I.o.w. check that header and come up with the best what can
suit your case.
> if (!finfo)
> return -ENOMEM;
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2022-12-20 17:07 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-20 16:36 [PATCH v7 0/4] Enhance definition of DFH and use enhancements for UART driver matthew.gerlach
2022-12-20 16:36 ` [PATCH v7 1/4] Documentation: fpga: dfl: Add documentation for DFHv1 matthew.gerlach
2022-12-20 16:53 ` Andy Shevchenko
2022-12-21 16:52 ` matthew.gerlach
2022-12-20 16:36 ` [PATCH v7 2/4] fpga: dfl: Add DFHv1 Register Definitions matthew.gerlach
2022-12-20 16:54 ` Andy Shevchenko
2022-12-20 16:36 ` [PATCH v7 3/4] fpga: dfl: add basic support for DFHv1 matthew.gerlach
2022-12-20 17:03 ` Andy Shevchenko [this message]
2022-12-21 19:14 ` matthew.gerlach
2022-12-26 3:15 ` Xu Yilun
2022-12-31 20:46 ` matthew.gerlach
2023-01-03 4:22 ` Xu Yilun
2023-01-03 19:50 ` matthew.gerlach
2023-01-04 2:34 ` Xu Yilun
2022-12-21 11:58 ` Ilpo Järvinen
2022-12-21 22:29 ` matthew.gerlach
2022-12-20 16:36 ` [PATCH v7 4/4] tty: serial: 8250: add DFL bus driver for Altera 16550 matthew.gerlach
2022-12-20 17:09 ` Andy Shevchenko
2022-12-21 17:26 ` Marco Pagani
2022-12-21 19:52 ` Marco Pagani
2022-12-21 22:37 ` matthew.gerlach
2022-12-21 22:16 ` matthew.gerlach
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