From: Sebastian Andrzej Siewior <bige...@linutronix.de> Date: Wed, 16 Oct 2019 10:28:33 +0200
> From: Marc Kleine-Budde <m...@pengutronix.de> > > With threaded interrupts enabled, the interrupt thread runs as SCHED_RR > with priority 50. If a user application with a higher priority preempts > the interrupt thread and tries to shutdown the network interface then it > will loop forever. The kernel will spin in the loop waiting for the > device to become idle and the scheduler will never consider the > interrupt thread because its priority is lower. > > Avoid the problem by sleeping for a jiffy giving other tasks, > including the interrupt thread, a chance to run and make progress. > > In the original thread it has been suggested to use wait_event() and > properly waiting for the state to occur. DaveM explained that this would > require to add expensive checks in the fast paths of packet processing. > > Link: > https://lkml.kernel.org/r/1393976987-23555-1-git-send-email-...@pengutronix.de > Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de> > [bigeasy: Rewrite commit message, add comment, use > schedule_timeout_uninterruptible()] > Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de> > --- > v1…v2: Typo fixes, noticed by Sergei Shtylyov. Applied, thank you.
