linux-kernel - Re: [PATCH] gpio: max7301: fix driver for use with CONFIG_VMAP

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Message-ID: <CACRpkdahnp42c1vT6JHLDVWerCqUH9ugSE4i9Xiu+y49xHE76g@mail.gmail.com>
Date:   Sun, 16 Dec 2018 01:14:55 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org list" <linuxppc-dev@...ts.ozlabs.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH] gpio: max7301: fix driver for use with CONFIG_VMAP_STACK

On Fri, Dec 7, 2018 at 2:07 PM Christophe Leroy <christophe.leroy@....fr> wrote:

> spi_read() and spi_write() require DMA-safe memory. When
> CONFIG_VMAP_STACK is selected, those functions cannot be used
> with buffers on stack.
>
> This patch replaces calls to spi_read() and spi_write() by
> spi_write_then_read() which doesn't require DMA-safe buffers.
>
> Fixes: 0c36ec314735 ("gpio: gpio driver for max7301 SPI GPIO expander")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Patch applied for fixes.

Yours,
Linus Walleij