netdev - Re: [EXT] [PATCH] octeontx2-af: cn10k: mcs: Fix a resource leak in the probe and remove functions

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Date:   Mon, 12 Dec 2022 06:47:12 +0000
From:   Geethasowjanya Akula <gakula@...vell.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Jerin Jacob Kollanukkaran <jerinj@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>,
        Subbaraya Sundeep Bhatta <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 Krishna Attunuru <vattunuru@...vell.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [EXT] [PATCH] octeontx2-af: cn10k: mcs: Fix a resource leak in
 the probe and remove functions

Ack.
Thanks for the patch.

Geetha.

________________________________________
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Sent: Saturday, December 10, 2022 11:05 PM
To: Sunil Kovvuri Goutham; Linu Cherian; Geethasowjanya Akula; Jerin Jacob Kollanukkaran; Hariprasad Kelam; Subbaraya Sundeep Bhatta; David S. Miller; Eric Dumazet; Jakub Kicinski; Paolo Abeni; Vamsi Krishna Attunuru
Cc: linux-kernel@...r.kernel.org; kernel-janitors@...r.kernel.org; Christophe JAILLET; netdev@...r.kernel.org
Subject: [EXT] [PATCH] octeontx2-af: cn10k: mcs: Fix a resource leak in the probe and remove functions

External Email

----------------------------------------------------------------------
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