Linux-SPI Archive on lore.kernel.org
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From: Lukas Wunner <lukas@wunner.de>
To: Mark Brown <broonie@kernel.org>
Cc: "Nicolas Saenz Julienne" <nsaenzjulienne@suse.de>,
	Martin Sperl <kernel@martin.sperl.org>,
	linux-spi@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
	Linus Walleij <linus.walleij@linaro.org>,
	Jingoo Han <jg1.han@samsung.com>
Subject: [PATCH 0/5] Raspberry Pi SPI unbind fixes
Date: Fri, 15 May 2020 17:58:00 +0200
Message-ID: <cover.1589557526.git.lukas@wunner.de> (raw)

This series fixes ordering issues occurring on unbind of the
Raspberry Pi SPI drivers:

Turns out devm_spi_register_controller() is prone to
incorrect use and dozens of drivers have gotten it wrong.
I'm only documenting this gotcha here and fixing it in the
Raspberry Pi drivers.  Fixing the rest is for another day.

There's also an ordering issue in the core which has been
present for 8 years and affects all platforms (patch [1/5]).
Doesn't look like unbinding is tested all that often. :-)


Lukas Wunner (5):
  spi: Fix controller unregister order
  spi: bcm2835: Fix controller unregister order
  spi: bcm2835aux: Fix controller unregister order
  spi: bcm2835: Tear down DMA before turning off SPI controller
  spi: Document devm_spi_register_controller() gotcha

 drivers/spi/spi-bcm2835.c    |  8 +++++---
 drivers/spi/spi-bcm2835aux.c |  4 +++-
 drivers/spi/spi.c            | 10 +++++++++-
 3 files changed, 17 insertions(+), 5 deletions(-)

-- 
2.26.2


             reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15 15:58 Lukas Wunner [this message]
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
2020-05-20 17:17 ` [PATCH 0/5] Raspberry Pi SPI unbind fixes Mark Brown

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