Commit be4017ce authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Thomas Gleixner
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PCI: hv: Use tasklet_disable_in_atomic() 



The hv_compose_msi_msg() callback in irq_chip::irq_compose_msi_msg is
invoked via irq_chip_compose_msi_msg(), which itself is always invoked from
atomic contexts from the guts of the interrupt core code.

There is no way to change this w/o rewriting the whole driver, so use
tasklet_disable_in_atomic() which allows to make tasklet_disable()
sleepable once the remaining atomic users are addressed.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarWei Liu <wei.liu@kernel.org>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210309084242.516519290@linutronix.de
parent 405698ca

drivers/pci/controller/pci-hyperv.c

+1 −1
Original line number Diff line number Diff line
@@ -1458,7 +1458,7 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) 
	 * Prevents hv_pci_onchannelcallback() from running concurrently

	 * in the tasklet.

	 */

	tasklet_disable(&channel->callback_event);

	tasklet_disable_in_atomic(&channel->callback_event);



	/*

	 * Since this function is called with IRQ locks held, can't