linux-kernel - Re: [PATCH 1/3] fpga: Add Efinix Trion & Titanium serial SPI programming driver

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Message-ID: <ZxG4TiP4tliF/bms@yilunxu-OptiPlex-7050>
Date: Fri, 18 Oct 2024 09:22:22 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: iansdannapel@...il.com, mdf@...nel.org, hao.wu@...el.com,
	yilun.xu@...el.com, trix@...hat.com, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, neil.armstrong@...aro.org,
	heiko.stuebner@...rry.de, rafal@...ecki.pl,
	linus.walleij@...aro.org, linux-fpga@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] fpga: Add Efinix Trion & Titanium serial SPI
 programming driver

> > +static int efinix_spi_apply_clk_cycles(struct efinix_spi_conf *conf)
> > +{
> > +	char data[13] = {0};
> > +
> > +	return spi_write(conf->spi, data, sizeof(data));
> 
> Hm, aren't buffers from stack discouraged? spi-summary explicitly
> mentions this case or I am getting this wrong?

You are right. And there were already some fixes for this issue in FPGA. E.g.

https://lore.kernel.org/all/20221230092922.18822-2-i.bornyakov@metrotek.ru/

Thanks,
Yilun