Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1626710 > unrolled thread

Re: [PATCH 2/3 v2] i2c: i2c-piix4: Use the common mutex

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH 2/3 v2] i2c: i2c-piix4: Use the common mutex Wolfram Sang <wsa@the-dreams.de> - 2017-04-19 20:50 +0200

#1626710 — Re: [PATCH 2/3 v2] i2c: i2c-piix4: Use the common mutex

[Multipart message — attachments visible in raw view] — view raw

On Mon, Apr 03, 2017 at 09:51:32AM +0200, Zoltan Boszormenyi wrote:
> Use the common mutex from driver/usb/host/pci-quirks.c in the
> i2c-piix4 driver to synchronize access to the I/O port pair
> 0xcd6 / 0xcd7.
> 
> At the same time, remove the request_region() call to reserve
> these I/O ports, so the sp5100_tco watchdog driver can also
> load. The mutex is enough to protect the I/O port accesses.
> This is an old regression in Linux 4.4-rc4, caused by:
> 
> v2: Explicit extern reference for sb800_mutex
> 
> commit 2fee61d22e606fc99ade9079fda15fdee83ec33e
> Author: Christian Fetzer <fetzer.ch@gmail.com>
> Date:   Thu Nov 19 20:13:48 2015 +0100
> 
>     i2c: piix4: Add support for multiplexed main adapter in SB800
> 
> Signed-off-by: Zoltan Boszormenyi <zboszor@pr.hu>

Given the global mutex approach is accepted, the actual changes here
look okay to me. I'd really like a tag from Jean here, still. He is the
expert for this hardware which I barely know.

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web