Netdev Archive on
 help / color / Atom feed
From: David Miller <>
Subject: Re: [PATCH 2/2] net: dsa: microchip: Add shared regmap mutex
Date: Sat, 12 Oct 2019 17:20:55 -0700 (PDT)
Message-ID: <> (raw)
In-Reply-To: <>

From: Marek Vasut <>
Date: Thu, 10 Oct 2019 20:25:08 +0200

> The KSZ driver uses one regmap per register width (8/16/32), each with
> it's own lock, but accessing the same set of registers. In theory, it
> is possible to create a race condition between these regmaps, although
> the underlying bus (SPI or I2C) locking should assure nothing bad will
> really happen and the accesses would be correct.
> To make the driver do the right thing, add one single shared mutex for
> all the regmaps used by the driver instead. This assures that even if
> some future hardware is on a bus which does not serialize the accesses
> the same way SPI or I2C does, nothing bad will happen.
> Note that the status_mutex was unused and only initied, hence it was
> renamed and repurposed as the regmap mutex.
> Signed-off-by: Marek Vasut <>


  reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10 18:25 [PATCH 1/2] net: dsa: microchip: Do not reinit mutexes on KSZ87xx Marek Vasut
2019-10-10 18:25 ` [PATCH 2/2] net: dsa: microchip: Add shared regmap mutex Marek Vasut
2019-10-13  0:20   ` David Miller [this message]
2019-10-13  0:21     ` David Miller
2019-10-13 10:50       ` Marek Vasut
2019-10-13 16:26         ` David Miller
2019-10-13  0:20 ` [PATCH 1/2] net: dsa: microchip: Do not reinit mutexes on KSZ87xx David Miller

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Netdev Archive on

Archives are clonable:
	git clone --mirror netdev/git/0.git
	git clone --mirror netdev/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 netdev netdev/ \
	public-inbox-index netdev

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone public-inbox