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From:   Ioana Ciornei <ioana.ciornei@nxp.com>
To:     davem@davemloft.net, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     youri.querry_1@nxp.com, leoyang.li@nxp.com,
        Ioana Ciornei <ioana.ciornei@nxp.com>
Subject: [PATCH net] soc: fsl: dpio: properly compute the consumer index
Date:   Tue,  5 May 2020 23:14:29 +0300
Message-Id: <20200505201429.24360-1-ioana.ciornei@nxp.com>
Reply-to: ioana.ciornei@nxp.com
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Mask the consumer index before using it. Without this, we would be
writing frame descriptors beyond the ring size supported by the QBMAN
block.

Fixes: 3b2abda7d28c ("soc: fsl: dpio: Replace QMAN array mode with ring mode enqueue")
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---

I am sending this fix through the net tree since the bug manifests
itself only on net-next and not the soc trees. This way it would be
easier to integrate this sooner rather than later.

 drivers/soc/fsl/dpio/qbman-portal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soc/fsl/dpio/qbman-portal.c b/drivers/soc/fsl/dpio/qbman-portal.c
index 804b8ba9bf5c..23a1377971f4 100644
--- a/drivers/soc/fsl/dpio/qbman-portal.c
+++ b/drivers/soc/fsl/dpio/qbman-portal.c
@@ -669,6 +669,7 @@ int qbman_swp_enqueue_multiple_direct(struct qbman_swp *s,
 		eqcr_ci = s->eqcr.ci;
 		p = s->addr_cena + QBMAN_CENA_SWP_EQCR_CI;
 		s->eqcr.ci = qbman_read_register(s, QBMAN_CINH_SWP_EQCR_CI);
+		s->eqcr.ci &= full_mask;
 
 		s->eqcr.available = qm_cyc_diff(s->eqcr.pi_ring_size,
 					eqcr_ci, s->eqcr.ci);
-- 
2.17.1