PCI/MSI: Protect MSI operations

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To prepare for dynamic extension of MSI-X vectors, protect the MSI
operations for MSI and MSI-X. This requires to move the invocation of
irq_create_affinity_masks() out of the descriptor lock section to avoid
reverse lock ordering vs. CPU hotplug lock as some callers of the PCI/MSI
allocation interfaces already hold it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20211206210747.982292705@linutronix.de

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Thomas Gleixner 2021-12-06 23:51:13 +01:00

parent 645474e2ce

commit 5512c5eaf5

2 changed files with 63 additions and 41 deletions

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4

drivers/pci/msi/irqdomain.c

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100

drivers/pci/msi/msi.c

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