[PATCH v2] PM / wakeirq: Convert to SRCU

[Rafael J. Wysocki]

On Monday, June 26, 2017 01:37:11 PM Brian Norris wrote:
> On Sun, Jun 25, 2017 at 07:31:13PM +0200, Thomas Gleixner wrote:
> > The wakeirq infrastructure uses RCU to protect the list of wakeirqs. That
> > breaks the irq bus locking infrastructure, which is allows sleeping
> > functions to be called so interrupt controllers behind slow busses,
> > e.g. i2c, can be handled.
> > 
> > The wakeirq functions hold rcu_read_lock and call into irq functions, which
> > in case of interrupts using the irq bus locking will trigger a
> > might_sleep() splat.
> > 
> > Convert the wakeirq infrastructure to Sleepable RCU and unbreak it.
> > 
> > Fixes: 4990d4fe327b ("PM / Wakeirq: Add automated device wake IRQ handling")
> > Reported-by: Brian Norris <briannorris at chromium.org>
> > Suggested-by: Paul E. McKenney <paulmck at linux.vnet.ibm.com>
> > Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
> > ---
> >  drivers/base/power/wakeup.c |   32 ++++++++++++++++++--------------
> >  1 file changed, 18 insertions(+), 14 deletions(-)
> 
> This resolves the warnings I've seen, for sure. And I don't seem to have
> any new suspend/resume problems, so:
> 
> Tested-by: Brian Norris <briannorris at chromium.org>

Applied with all tags, thanks!