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nvme: Fix spurious interrupts 

The code had asserted an interrupt every time it was requested to check
for new completion queue entries.This can result in spurious interrupts
seen by the guest OS.

Fix this by asserting an interrupt only if there are un-acknowledged
completion queue entries available.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Keith Busch 2018-11-26 10:17:45 -07:00 committed by Kevin Wolf
parent 330ca111ea
commit 6da021815e
1 changed files with 3 additions and 1 deletions
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4
hw/block/nvme.c
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@ -272,7 +272,9 @@ static void nvme_post_cqes(void *opaque)
sizeof(req->cqe));
QTAILQ_INSERT_TAIL(&sq->req_list, req, entry);
}
nvme_irq_assert(n, cq);
if (cq->tail != cq->head) {
nvme_irq_assert(n, cq);
}
}
static void nvme_enqueue_req_completion(NvmeCQueue *cq, NvmeRequest *req)