[PATCH 1/4] nvmet: pci-epf: Clear completion queue IRQ flag on delete

[Damien Le Moal <dlemoal@kernel.org>]

The function nvmet_pci_epf_delete_cq() unconditionnally calls
nvmet_pci_epf_remove_irq_vector() even for completion queues that do not
have interrupts enabled. Furthermore, for completion queues that do
have IRQ enabled, deleting and re-creating the completion queue leaves
the flag NVMET_PCI_EPF_Q_IRQ_ENABLED set, even if the completion queue
is being re-created with IRQ disabled.

Fix these issues by calling nvmet_pci_epf_remove_irq_vector() only if
NVMET_PCI_EPF_Q_IRQ_ENABLED is set and make sure to always clear that
flag.

Fixes: 0faa0fe6f90e ("nvmet: New NVMe PCI endpoint function target driver")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---
 drivers/nvme/target/pci-epf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/pci-epf.c b/drivers/nvme/target/pci-epf.c
index 7fab7f3d79b7..d5442991f2fb 100644
--- a/drivers/nvme/target/pci-epf.c
+++ b/drivers/nvme/target/pci-epf.c
@@ -1344,7 +1344,8 @@ static u16 nvmet_pci_epf_delete_cq(struct nvmet_ctrl *tctrl, u16 cqid)
 
 	cancel_delayed_work_sync(&cq->work);
 	nvmet_pci_epf_drain_queue(cq);
-	nvmet_pci_epf_remove_irq_vector(ctrl, cq->vector);
+	if (test_and_clear_bit(NVMET_PCI_EPF_Q_IRQ_ENABLED, &cq->flags))
+		nvmet_pci_epf_remove_irq_vector(ctrl, cq->vector);
 	nvmet_pci_epf_mem_unmap(ctrl->nvme_epf, &cq->pci_map);
 
 	return NVME_SC_SUCCESS;
-- 
2.49.0