linux-kernel - [PATCH AUTOSEL 6.14 08/23] nvmet: pci-epf: cleanup nvmet_pci_epf_raise

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Message-Id: <20250519212131.1985647-8-sashal@kernel.org>
Date: Mon, 19 May 2025 17:21:15 -0400
From: Sasha Levin <sashal@...nel.org>
To: patches@...ts.linux.dev,
	stable@...r.kernel.org
Cc: Damien Le Moal <dlemoal@...nel.org>,
	Niklas Cassel <cassel@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Sasha Levin <sashal@...nel.org>,
	sagi@...mberg.me,
	linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH AUTOSEL 6.14 08/23] nvmet: pci-epf: cleanup nvmet_pci_epf_raise_irq()

From: Damien Le Moal <dlemoal@...nel.org>

[ Upstream commit 4236e600bf902202214aa6277e84c4738c56f762 ]

There is no point in taking the controller irq_lock and calling
nvmet_pci_epf_should_raise_irq() for a completion queue which does not
have IRQ enabled (NVMET_PCI_EPF_Q_IRQ_ENABLED flag is not set).
Move the test for the NVMET_PCI_EPF_Q_IRQ_ENABLED flag out of
nvmet_pci_epf_should_raise_irq() to the top of nvmet_pci_epf_raise_irq()
to return early when no IRQ should be raised.

Also, use dev_err_ratelimited() to avoid a message storm under load when
raising IRQs is failing.

Signed-off-by: Damien Le Moal <dlemoal@...nel.org>
Reviewed-by: Niklas Cassel <cassel@...nel.org>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/target/pci-epf.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/target/pci-epf.c b/drivers/nvme/target/pci-epf.c
index bc1daa9aede9d..80d857798bddd 100644
--- a/drivers/nvme/target/pci-epf.c
+++ b/drivers/nvme/target/pci-epf.c
@@ -596,9 +596,6 @@ static bool nvmet_pci_epf_should_raise_irq(struct nvmet_pci_epf_ctrl *ctrl,
 	struct nvmet_pci_epf_irq_vector *iv = cq->iv;
 	bool ret;
 
-	if (!test_bit(NVMET_PCI_EPF_Q_IRQ_ENABLED, &cq->flags))
-		return false;
-
 	/* IRQ coalescing for the admin queue is not allowed. */
 	if (!cq->qid)
 		return true;
@@ -625,7 +622,8 @@ static void nvmet_pci_epf_raise_irq(struct nvmet_pci_epf_ctrl *ctrl,
 	struct pci_epf *epf = nvme_epf->epf;
 	int ret = 0;
 
-	if (!test_bit(NVMET_PCI_EPF_Q_LIVE, &cq->flags))
+	if (!test_bit(NVMET_PCI_EPF_Q_LIVE, &cq->flags) ||
+	    !test_bit(NVMET_PCI_EPF_Q_IRQ_ENABLED, &cq->flags))
 		return;
 
 	mutex_lock(&ctrl->irq_lock);
@@ -656,7 +654,9 @@ static void nvmet_pci_epf_raise_irq(struct nvmet_pci_epf_ctrl *ctrl,
 	}
 
 	if (ret)
-		dev_err(ctrl->dev, "Failed to raise IRQ (err=%d)\n", ret);
+		dev_err_ratelimited(ctrl->dev,
+				    "CQ[%u]: Failed to raise IRQ (err=%d)\n",
+				    cq->qid, ret);
 
 unlock:
 	mutex_unlock(&ctrl->irq_lock);
-- 
2.39.5