Linux-SPI Archive on lore.kernel.org
 help / color / Atom feed
From: Mark Brown <broonie@kernel.org>
To: Lukas Wunner <lukas@wunner.de>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
	Martin Sperl <kernel@martin.sperl.org>,
	linux-spi@vger.kernel.org, linux-rpi-kernel@lists.infradead.org
Subject: Re: [PATCH 5/5] spi: Document devm_spi_register_controller() gotcha
Date: Fri, 15 May 2020 17:30:00 +0100
Message-ID: <20200515163000.GI5066@sirena.org.uk> (raw)
In-Reply-To: <d0dcbd098401b5d2a486eee7cf2f9dcabacf9605.1589557526.git.lukas@wunner.de>


[-- Attachment #1: Type: text/plain, Size: 460 bytes --]

On Fri, May 15, 2020 at 05:58:05PM +0200, Lukas Wunner wrote:
> As a rule, devm_spi_register_controller() must not be used if the
> driver's ->remove() hook performs teardown steps which shall be
> performed after unbinding of slaves.
> 
> Dozens of drivers are doing it wrong.  Document this gotcha to
> hopefully prevent further misuse.

This is something that needs to be documented at the devm level, it
applies to pretty much every managed API.

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15 15:58 [PATCH 0/5] Raspberry Pi SPI unbind fixes Lukas Wunner
2020-05-15 15:58 ` [PATCH 1/5] spi: Fix controller unregister order Lukas Wunner
2020-05-15 16:27   ` Mark Brown
2020-05-15 16:31     ` Lukas Wunner
2020-05-15 21:37       ` Andy Shevchenko
2020-05-16  6:45         ` Lukas Wunner
2020-05-16  9:45           ` Andy Shevchenko
2020-05-15 15:58 ` [PATCH 2/5] spi: bcm2835: " Lukas Wunner
2020-05-15 16:29   ` Mark Brown
2020-05-15 16:44     ` Lukas Wunner
2020-05-15 21:33       ` Andy Shevchenko
2020-05-16  6:56         ` Lukas Wunner
2020-05-16  9:40           ` Andy Shevchenko
2020-05-15 15:58 ` [PATCH 3/5] spi: bcm2835aux: " Lukas Wunner
2020-05-15 15:58 ` [PATCH 4/5] spi: bcm2835: Tear down DMA before turning off SPI controller Lukas Wunner
2020-05-15 15:58 ` [PATCH 5/5] spi: Document devm_spi_register_controller() gotcha Lukas Wunner
2020-05-15 16:30   ` Mark Brown [this message]
2020-05-20 17:17 ` [PATCH 0/5] Raspberry Pi SPI unbind fixes Mark Brown

Reply instructions:

You may reply publicly 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:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

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

  git send-email \
    --in-reply-to=20200515163000.GI5066@sirena.org.uk \
    --to=broonie@kernel.org \
    --cc=kernel@martin.sperl.org \
    --cc=linux-rpi-kernel@lists.infradead.org \
    --cc=linux-spi@vger.kernel.org \
    --cc=lukas@wunner.de \
    --cc=nsaenzjulienne@suse.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

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

Linux-SPI Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-spi/0 linux-spi/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-spi linux-spi/ https://lore.kernel.org/linux-spi \
		linux-spi@vger.kernel.org
	public-inbox-index linux-spi

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-spi


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git