diff options
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/nvme.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c index 4bfed59..1c3cd6c 100644 --- a/drivers/block/nvme.c +++ b/drivers/block/nvme.c @@ -842,8 +842,13 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) nvme_setup_prps(&c.common, sg, length); nvmeq = get_nvmeq(ns); - status = nvme_submit_sync_cmd(nvmeq, &c, &result); + /* Since nvme_submit_sync_cmd sleeps, we can't keep preemption + * disabled. We may be preempted at any point, and be rescheduled + * to a different CPU. That will cause cacheline bouncing, but no + * additional races since q_lock already protects against other CPUs. + */ put_nvmeq(nvmeq); + status = nvme_submit_sync_cmd(nvmeq, &c, &result); nvme_unmap_user_pages(dev, io.opcode & 1, io.addr, length, sg, nents); put_user(result, &uio->result); |
