linux-kernel - [PATCH] octeontx2-af: cn10k: mcs: Fix a resource leak in the probe and remove functions

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Date:   Sat, 10 Dec 2022 18:35:00 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Sunil Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Jerin Jacob <jerinj@...vell.com>,
        hariprasad <hkelam@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vamsi Attunuru <vattunuru@...vell.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        netdev@...r.kernel.org
Subject: [PATCH] octeontx2-af: cn10k: mcs: Fix a resource leak in the probe and remove functions

In mcs_register_interrupts(), a call to request_irq() is not balanced by a
corresponding free_irq(), neither in the error handling path, nor in the
remove function.

Add the missing calls.

Fixes: 6c635f78c474 ("octeontx2-af: cn10k: mcs: Handle MCS block interrupts")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
This patch is untested and speculative.
I'm always reluctant to send patches around irq management, because it is
sometimes tricky.
Review with care!

Maybe introducing a mcs_unregister_interrupts() function would be cleaner
and more future proof.
---
 drivers/net/ethernet/marvell/octeontx2/af/mcs.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mcs.c b/drivers/net/ethernet/marvell/octeontx2/af/mcs.c
index c0bedf402da9..f68a6a0e3aa4 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/mcs.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mcs.c
@@ -1184,10 +1184,13 @@ static int mcs_register_interrupts(struct mcs *mcs)
 	mcs->tx_sa_active = alloc_mem(mcs, mcs->hw->sc_entries);
 	if (!mcs->tx_sa_active) {
 		ret = -ENOMEM;
-		goto exit;
+		goto free_irq;
 	}
 
 	return ret;
+
+free_irq:
+	free_irq(pci_irq_vector(mcs->pdev, MCS_INT_VEC_IP), mcs);
 exit:
 	pci_free_irq_vectors(mcs->pdev);
 	mcs->num_vec = 0;
@@ -1589,6 +1592,7 @@ static void mcs_remove(struct pci_dev *pdev)
 
 	/* Set MCS to external bypass */
 	mcs_set_external_bypass(mcs, true);
+	free_irq(pci_irq_vector(pdev, MCS_INT_VEC_IP), mcs);
 	pci_free_irq_vectors(pdev);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
-- 
2.34.1