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NVMe: Correctly handle IOCTL_SUBMIT_IO when cpus > online queues

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nvme_submit_io_cmd() uses smp_processor_id() to pick an IO queue index.
This patch fixes the case where there are more cpus from which the ioctl
call can originate than online queues, which can happen when a device
supports or was allocated fewer interrupt vectors than exist cpu cores.

Thanks to Keith Busch for the implementation suggestion.

Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Sam Bradshaw 2014-07-29 13:31:36 -07:00 committed by Jens Axboe
parent 302c6727e5
commit 5905535610
1 changed files with 2 additions and 2 deletions
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4
drivers/block/nvme-core.c
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@ -984,8 +984,8 @@ int nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd,
int nvme_submit_io_cmd(struct nvme_dev *dev, struct nvme_command *cmd,
u32 *result)
{
return nvme_submit_sync_cmd(dev, smp_processor_id() + 1, cmd, result,
NVME_IO_TIMEOUT);
return nvme_submit_sync_cmd(dev, this_cpu_read(*dev->io_queue), cmd,
result, NVME_IO_TIMEOUT);
}
static int nvme_submit_admin_cmd_async(struct nvme_dev *dev,