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Date: Tue, 5 May 2020 23:14:29 +0300
From: Ioana Ciornei <ioana.ciornei@....com>
To: davem@...emloft.net, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: youri.querry_1@....com, leoyang.li@....com,
Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH net] soc: fsl: dpio: properly compute the consumer index
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@....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
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