Possibly update subject to be more descriptive, along lines of:
Serialize INTx masking/unmasking
On Thu, Aug 19, 2021 at 07:56:06PM +0900, Kunihiko Hayashi wrote:
The same condition register PCI_RCV_INTX is used in irq_mask(),
irq_unmask() and irq_ack() callbacks. Accesses to register can occur at the
same time without lock.
This introduces a lock into the callbacks to prevent the issue.
Rewrap into a single paragraph or add blank line between paragraphs.
s/This introduces/Add/ to make this an imperative description of what
you want this patch to do. No need for "This" since the context is
obvious.