[PATCH 3/3] nvme/pci: Fix read queue count

[Keith Busch <kbusch@kernel.org>]

If nvme.write_queues and poll_queues are specified, we expect the driver
may request more queues than CPUs if the device's queue count feature
is large enough. The driver, however, had been decreasing the number of
possible interrupt enabled queues, artifically limiting the number of
read queues even if the controller could support more.

The driver doesn't request more IO queues than CPUs for each queues type
anyway, so remove the cpu count comparison to the number of interrupt
enabled io queues.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 drivers/nvme/host/pci.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 6b6452486155..d3bed5df9ef1 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2062,7 +2062,6 @@ static int nvme_setup_irqs(struct nvme_dev *dev, unsigned int nr_io_queues)
 		.priv		= dev,
 	};
 	unsigned int irq_queues, this_p_queues;
-	unsigned int nr_cpus = num_possible_cpus();
 
 	/*
 	 * Poll queues don't need interrupts, but we need at least one IO
@@ -2073,10 +2072,7 @@ static int nvme_setup_irqs(struct nvme_dev *dev, unsigned int nr_io_queues)
 		this_p_queues = nr_io_queues - 1;
 		irq_queues = 1;
 	} else {
-		if (nr_cpus < nr_io_queues - this_p_queues)
-			irq_queues = nr_cpus + 1;
-		else
-			irq_queues = nr_io_queues - this_p_queues + 1;
+		irq_queues = nr_io_queues - this_p_queues + 1;
 	}
 	dev->io_queues[HCTX_TYPE_POLL] = this_p_queues;
 
-- 
2.21.0


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