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* [PATCH 0/2] hwspinlock: add the 'in_atomic' API
@ 2019-03-07 15:58 Fabien Dessenne
  2019-03-07 15:58 ` [PATCH 1/2] hwspinlock: document the hwspinlock 'raw' API Fabien Dessenne
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: Fabien Dessenne @ 2019-03-07 15:58 UTC (permalink / raw)
  To: Ohad Ben-Cohen, Bjorn Andersson, Jonathan Corbet,
	linux-remoteproc, linux-doc, linux-kernel
  Cc: Fabien Dessenne, Benjamin Gaignard, Alexandre Torgue

In its current implementation, the hwspinlock framework relies on jiffies
to handle the timeout of the hwspin_lock_timeout_xxx() API.
In an atomic context (or more precisely when irq are disabled) jiffies does not
increase, which prevents the timeout to reach its target value (infinite loop).

Note that there is already an hwspinlock user that runs in atomic context
(drivers/irqchip/irq-stm32-exti.c) and that has to handle by itself the
timeout.

The first patch of the series completes the Documentation (the 'raw' API
is not documented), and the second patch provides with the 'in_atomic' API.

Fabien Dessenne (2):
  hwspinlock: document the hwspinlock 'raw' API
  hwspinlock: add the 'in_atomic' API

 Documentation/hwspinlock.txt         | 81 ++++++++++++++++++++++++++++++++++++
 drivers/hwspinlock/hwspinlock_core.c | 43 +++++++++++++------
 include/linux/hwspinlock.h           | 61 +++++++++++++++++++++++++--
 3 files changed, 169 insertions(+), 16 deletions(-)

-- 
2.7.4


^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2019-06-30  4:08 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-03-07 15:58 [PATCH 0/2] hwspinlock: add the 'in_atomic' API Fabien Dessenne
2019-03-07 15:58 ` [PATCH 1/2] hwspinlock: document the hwspinlock 'raw' API Fabien Dessenne
2019-03-07 15:58 ` [PATCH 2/2] hwspinlock: add the 'in_atomic' API Fabien Dessenne
2019-05-13  9:10 ` [PATCH 0/2] " Fabien DESSENNE
2019-06-30  4:08 ` Bjorn Andersson

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