From: Peter Rosin <peda@axentia.se>
To: Julia Cartwright <julia@ni.com>, Wolfram Sang <wsa@the-dreams.de>
Cc: <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>, <linux-i2c@vger.kernel.org>
Subject: Re: [PATCH 12/19] i2c: mux: pca954x: make use of raw_spinlock variants
Date: Thu, 16 Mar 2017 20:38:06 +0100 [thread overview]
Message-ID: <910fae4d-e5a7-f149-1daf-44e5487bf643@axentia.se> (raw)
In-Reply-To: <a5015f6a7ecc2f84e9026c309ca2753c0cb3a1fa.1489015238.git.julia@ni.com>
On 2017-03-09 17:21, Julia Cartwright wrote:
> The pca954x i2c mux driver currently implements an irq_chip for handling
> interrupts; due to how irq_chip handling is done, it's necessary for the
> irq_chip methods to be invoked from hardirq context, even on a a
> real-time kernel. Because the spinlock_t type becomes a "sleeping"
> spinlock w/ RT kernels, it is not suitable to be used with irq_chips.
>
> A quick audit of the operations under the lock reveal that they do only
> minimal, bounded work, and are therefore safe to do under a raw spinlock.
>
> Signed-off-by: Julia Cartwright <julia@ni.com>
Patch applied to the i2c-mux repo. Thanks!
Cheers,
peda
next prev parent reply other threads:[~2017-03-16 19:54 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-09 16:21 [PATCH 00/19] fixup usage of non-raw spinlocks in irqchips Julia Cartwright
2017-03-09 16:21 ` [PATCH 01/19] Coccinelle: locks: identify callers of spin_lock{,_irq,_irqsave}() in irqchip implementations Julia Cartwright
2017-03-09 20:15 ` Julia Lawall
2017-03-09 21:37 ` Julia Cartwright
2017-03-09 16:21 ` [PATCH 02/19] gpio: altera: make use of raw_spinlock variants Julia Cartwright
2017-03-15 9:53 ` Linus Walleij
2017-03-09 16:21 ` [PATCH 03/19] alpha: marvel: " Julia Cartwright
2017-03-12 2:58 ` kbuild test robot
2017-03-09 16:21 ` [PATCH 04/19] powerpc: mpc52xx_gpt: " Julia Cartwright
2017-03-09 16:21 ` [PATCH 05/19] gpio: 104-dio-48e: " Julia Cartwright
2017-03-09 18:35 ` William Breathitt Gray
2017-03-15 9:54 ` Linus Walleij
2017-03-09 16:21 ` [PATCH 06/19] gpio: ath79: " Julia Cartwright
2017-03-13 19:51 ` Alban
2017-03-15 9:59 ` Linus Walleij
2017-03-09 16:21 ` [PATCH 07/19] gpio: bcm-kona: " Julia Cartwright
2017-03-10 17:28 ` Ray Jui
2017-03-10 19:35 ` Julia Cartwright
2017-03-15 9:57 ` Linus Walleij
2017-03-15 9:56 ` Linus Walleij
2017-03-09 16:21 ` [PATCH 08/19] gpio: etraxfs: " Julia Cartwright
2017-03-15 10:00 ` Linus Walleij
2017-03-09 16:21 ` [PATCH 09/19] gpio: pl061: " Julia Cartwright
2017-03-15 10:01 ` Linus Walleij
2017-03-09 16:21 ` [PATCH 10/19] gpio: ws16c48: " Julia Cartwright
2017-03-09 18:36 ` William Breathitt Gray
2017-03-15 10:02 ` Linus Walleij
2017-03-09 16:21 ` [PATCH 11/19] gpio: zx: " Julia Cartwright
2017-03-15 10:03 ` Linus Walleij
2017-03-09 16:21 ` [PATCH 12/19] i2c: mux: pca954x: " Julia Cartwright
2017-03-16 19:38 ` Peter Rosin [this message]
2017-03-09 16:22 ` [PATCH 13/19] mfd: asic3: " Julia Cartwright
2017-03-09 16:22 ` [PATCH 14/19] mfd: t7l66xb: " Julia Cartwright
2017-03-15 11:17 ` Lee Jones
2017-03-15 19:07 ` Julia Cartwright
2017-03-16 9:22 ` Lee Jones
2017-03-09 16:22 ` [PATCH 15/19] mfd: tc6393xb: " Julia Cartwright
2017-03-09 16:22 ` [PATCH 16/19] pinctrl: bcm: " Julia Cartwright
2017-03-15 10:11 ` Linus Walleij
2017-03-09 16:22 ` [PATCH 17/19] pinctrl: amd: " Julia Cartwright
2017-03-15 10:12 ` Linus Walleij
2017-03-09 16:22 ` [PATCH 18/19] pinctrl: sirf: atlas7: " Julia Cartwright
2017-03-15 10:13 ` Linus Walleij
2017-03-09 16:22 ` [PATCH 19/19] pinctrl: sunxi: " Julia Cartwright
2017-03-15 10:14 ` Linus Walleij
2017-03-15 9:51 ` [PATCH 00/19] fixup usage of non-raw spinlocks in irqchips Linus Walleij
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