From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: Qiang Zhao <qiang.zhao@nxp.com>, Li Yang <leoyang.li@nxp.com>,
Christophe Leroy <christophe.leroy@c-s.fr>
Cc: linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Scott Wood <oss@buserror.net>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
netdev@vger.kernel.org
Subject: [PATCH v4 44/47] net/wan/fsl_ucc_hdlc: fix reading of __be16 registers
Date: Fri, 8 Nov 2019 14:01:20 +0100 [thread overview]
Message-ID: <20191108130123.6839-45-linux@rasmusvillemoes.dk> (raw)
In-Reply-To: <20191108130123.6839-1-linux@rasmusvillemoes.dk>
When releasing the allocated muram resource, we rely on reading back
the offsets from the riptr/tiptr registers. But those registers are
__be16 (and we indeed write them using iowrite16be), so we can't just
read them back with a normal C dereference.
This is not currently a real problem, since for now the driver is
PPC32-only. But it will soon be allowed to be used on arm and arm64 as
well.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
drivers/net/wan/fsl_ucc_hdlc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index 405b24a5a60d..8d13586bb774 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -732,8 +732,8 @@ static int uhdlc_open(struct net_device *dev)
static void uhdlc_memclean(struct ucc_hdlc_private *priv)
{
- qe_muram_free(priv->ucc_pram->riptr);
- qe_muram_free(priv->ucc_pram->tiptr);
+ qe_muram_free(ioread16be(&priv->ucc_pram->riptr));
+ qe_muram_free(ioread16be(&priv->ucc_pram->tiptr));
if (priv->rx_bd_base) {
dma_free_coherent(priv->dev,
--
2.23.0
next prev parent reply other threads:[~2019-11-08 13:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191108130123.6839-1-linux@rasmusvillemoes.dk>
2019-11-08 13:00 ` [PATCH v4 03/47] soc: fsl: qe: rename qe_(clr/set/clrset)bit* helpers Rasmus Villemoes
2019-11-08 13:01 ` [PATCH v4 43/47] net/wan/fsl_ucc_hdlc: avoid use of IS_ERR_VALUE() Rasmus Villemoes
2019-11-08 13:01 ` Rasmus Villemoes [this message]
2019-11-08 13:01 ` [PATCH v4 45/47] net/wan/fsl_ucc_hdlc: reject muram offsets above 64K Rasmus Villemoes
2019-11-15 4:41 ` Timur Tabi
2019-11-15 7:44 ` Rasmus Villemoes
2019-11-15 14:33 ` Timur Tabi
2019-11-08 13:01 ` [PATCH v4 46/47] net: ethernet: freescale: make UCC_GETH explicitly depend on PPC32 Rasmus Villemoes
2019-11-15 4:35 ` Timur Tabi
2019-11-15 5:44 ` Li Yang
2019-11-15 7:54 ` Rasmus Villemoes
2019-11-15 14:32 ` Timur Tabi
2019-11-15 14:31 ` Timur Tabi
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