linux-kernel - [PATCH 2/2] octeon_ep: Fix irq releasing in the error handling path of octep_request

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Message-Id: <a1b6f082fff4e68007914577961113bc452c8030.1652629833.git.christophe.jaillet@wanadoo.fr>
Date:   Sun, 15 May 2022 17:56:45 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Veerasenareddy Burru <vburru@...vell.com>,
        Abhijit Ayarekar <aayarekar@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Satananda Burla <sburla@...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 2/2] octeon_ep: Fix irq releasing in the error handling path of octep_request_irqs()

For the error handling to work as expected, the index in the
'oct->msix_entries' array must be tweaked because, when the irq are
requested there is:
	msix_entry = &oct->msix_entries[i + num_non_ioq_msix];

So in the error handling path, 'i + num_non_ioq_msix' should be used
instead of 'i'.

The 2nd argument of free_irq() also needs to be adjusted.

Fixes: 37d79d059606 ("octeon_ep: add Tx/Rx processing and interrupt support")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
I think that the wording above is awful, but I'm sure you get it.
Feel free to rephrase everything to have it more readable.
---
 drivers/net/ethernet/marvell/octeon_ep/octep_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
index 6b60a03574a0..4dcae805422b 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
@@ -257,10 +257,12 @@ static int octep_request_irqs(struct octep_device *oct)
 
 	return 0;
 ioq_irq_err:
+	i += num_non_ioq_msix;
 	while (i > num_non_ioq_msix) {
 		--i;
 		irq_set_affinity_hint(oct->msix_entries[i].vector, NULL);
-		free_irq(oct->msix_entries[i].vector, oct->ioq_vector[i]);
+		free_irq(oct->msix_entries[i].vector,
+			 oct->ioq_vector[i - num_non_ioq_msix]);
 	}
 non_ioq_irq_err:
 	while (i) {
-- 
2.34.1