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lib/irq_poll: Support schedules in non-interrupt contexts

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Do not assume irq_poll_sched() is called from an interrupt context only.
So use raise_softirq_irqoff() instead of __raise_softirq_irqoff() so it
will kick the ksoftirqd if the schedule is from a non-interrupt context.

This is required for RDMA drivers, like soft iwarp, that generate cq
completion notifications in a workqueue or kthread context.  Without this
change, siw completion notifications to the ULP can take several hundred
usecs, depending on the system load.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Steve Wise 2019-02-06 13:11:49 -08:00 committed by Jason Gunthorpe
parent 66920e1b25
commit 4133b013fa
1 changed files with 1 additions and 1 deletions
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2
lib/irq_poll.c
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@ -35,7 +35,7 @@ void irq_poll_sched(struct irq_poll *iop)
local_irq_save(flags);
list_add_tail(&iop->list, this_cpu_ptr(&blk_cpu_iopoll));
__raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
local_irq_restore(flags);
}
EXPORT_SYMBOL(irq_poll_sched);