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: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Wei Liu <wei.liu@kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210309084242.516519290@linutronix.de

drivers/pci/controller/pci-hyperv.c

@@ -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