From mboxrd@z Thu Jan 1 00:00:00 1970 From: sbradshaw@micron.com (Sam Bradshaw) Date: Fri, 25 Jul 2014 14:45:31 -0700 Subject: [PATCH] NVMe: Correctly handle IOCTL_SUBMIT_IO when cpus > online queues Message-ID: <53D2CFFB.8010908@micron.com> nvme_submit_io_cmd() use 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. Signed-off-by: Sam Bradshaw --- diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c index 28aec2d..5171753 100644 --- a/drivers/block/nvme-core.c +++ b/drivers/block/nvme-core.c @@ -979,8 +979,9 @@ 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, (smp_processor_id() % + (dev->online_queues - 1)) + 1, + cmd, result, NVME_IO_TIMEOUT); } static int nvme_submit_admin_cmd_async(struct nvme_dev *dev,