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nvme-pci: Simplify nvme_poll_irqdisable

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The timeout handler can use the existing nvme_poll() if it needs to
check a polled queue, allowing nvme_poll_irqdisable() to handle only
irq driven queues for the remaining callers.

Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Keith Busch 2020-03-04 09:17:01 -08:00
parent 324b494c28
commit fa059b856a
1 changed files with 11 additions and 19 deletions
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30
drivers/nvme/host/pci.c
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@ -1020,30 +1020,18 @@ static irqreturn_t nvme_irq_check(int irq, void *data)
}
/*
* Poll for completions any queue, including those not dedicated to polling.
* Poll for completions for any interrupt driven queue
* Can be called from any context.
*/
static int nvme_poll_irqdisable(struct nvme_queue *nvmeq)
static void nvme_poll_irqdisable(struct nvme_queue *nvmeq)
{
struct pci_dev *pdev = to_pci_dev(nvmeq->dev->dev);
int found;
/*
* For a poll queue we need to protect against the polling thread
* using the CQ lock. For normal interrupt driven threads we have
* to disable the interrupt to avoid racing with it.
*/
if (test_bit(NVMEQ_POLLED, &nvmeq->flags)) {
spin_lock(&nvmeq->cq_poll_lock);
found = nvme_process_cq(nvmeq);
spin_unlock(&nvmeq->cq_poll_lock);
} else {
disable_irq(pci_irq_vector(pdev, nvmeq->cq_vector));
found = nvme_process_cq(nvmeq);
enable_irq(pci_irq_vector(pdev, nvmeq->cq_vector));
}
WARN_ON_ONCE(test_bit(NVMEQ_POLLED, &nvmeq->flags));
return found;
disable_irq(pci_irq_vector(pdev, nvmeq->cq_vector));
nvme_process_cq(nvmeq);
enable_irq(pci_irq_vector(pdev, nvmeq->cq_vector));
}
static int nvme_poll(struct blk_mq_hw_ctx *hctx)
@ -1232,7 +1220,11 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
/*
* Did we miss an interrupt?
*/
nvme_poll_irqdisable(nvmeq);
if (test_bit(NVMEQ_POLLED, &nvmeq->flags))
nvme_poll(req->mq_hctx);
else
nvme_poll_irqdisable(nvmeq);
if (blk_mq_request_completed(req)) {
dev_warn(dev->ctrl.device,
"I/O %d QID %d timeout, completion polled\n",