From: Ansuel Smith <ansuelsmth@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>,
Vivien Didelot <vivien.didelot@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Ansuel Smith <ansuelsmth@gmail.com>
Subject: [PATCH net-next v6 04/25] net: dsa: qca8k: handle qca8k_set_page errors
Date: Fri, 14 May 2021 22:59:54 +0200 [thread overview]
Message-ID: <20210514210015.18142-5-ansuelsmth@gmail.com> (raw)
In-Reply-To: <20210514210015.18142-1-ansuelsmth@gmail.com>
With a remote possibility, the set_page function can fail. Since this is
a critical part of the write/read qca8k regs, propagate the error and
terminate any read/write operation.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
drivers/net/dsa/qca8k.c | 33 ++++++++++++++++++++++++++-------
1 file changed, 26 insertions(+), 7 deletions(-)
diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 3c882d325fdf..c9830286fd6d 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -127,16 +127,23 @@ qca8k_mii_write32(struct mii_bus *bus, int phy_id, u32 regnum, u32 val)
"failed to write qca8k 32bit register\n");
}
-static void
+static int
qca8k_set_page(struct mii_bus *bus, u16 page)
{
+ int ret;
+
if (page == qca8k_current_page)
- return;
+ return 0;
- if (bus->write(bus, 0x18, 0, page) < 0)
+ ret = bus->write(bus, 0x18, 0, page);
+ if (ret < 0) {
dev_err_ratelimited(&bus->dev,
"failed to set qca8k page\n");
+ return ret;
+ }
+
qca8k_current_page = page;
+ return 0;
}
static u32
@@ -150,11 +157,14 @@ qca8k_read(struct qca8k_priv *priv, u32 reg)
mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
- qca8k_set_page(bus, page);
+ val = qca8k_set_page(bus, page);
+ if (val < 0)
+ goto exit;
+
val = qca8k_mii_read32(bus, 0x10 | r2, r1);
+exit:
mutex_unlock(&bus->mdio_lock);
-
return val;
}
@@ -163,14 +173,19 @@ qca8k_write(struct qca8k_priv *priv, u32 reg, u32 val)
{
struct mii_bus *bus = priv->bus;
u16 r1, r2, page;
+ int ret;
qca8k_split_addr(reg, &r1, &r2, &page);
mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
- qca8k_set_page(bus, page);
+ ret = qca8k_set_page(bus, page);
+ if (ret < 0)
+ goto exit;
+
qca8k_mii_write32(bus, 0x10 | r2, r1, val);
+exit:
mutex_unlock(&bus->mdio_lock);
}
@@ -185,12 +200,16 @@ qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 val)
mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
- qca8k_set_page(bus, page);
+ ret = qca8k_set_page(bus, page);
+ if (ret < 0)
+ goto exit;
+
ret = qca8k_mii_read32(bus, 0x10 | r2, r1);
ret &= ~mask;
ret |= val;
qca8k_mii_write32(bus, 0x10 | r2, r1, ret);
+exit:
mutex_unlock(&bus->mdio_lock);
return ret;
--
2.30.2
next prev parent reply other threads:[~2021-05-14 21:00 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-14 20:59 [PATCH net-next v6 00/25] Multiple improvement to qca8k stability Ansuel Smith
2021-05-14 20:59 ` [PATCH net-next v6 01/25] net: dsa: qca8k: change simple print to dev variant Ansuel Smith
2021-05-14 22:43 ` Russell King (Oracle)
2021-05-14 20:59 ` [PATCH net-next v6 02/25] net: dsa: qca8k: use iopoll macro for qca8k_busy_wait Ansuel Smith
2021-05-14 22:52 ` Russell King (Oracle)
2021-05-14 23:07 ` Ansuel Smith
2021-05-14 20:59 ` [PATCH net-next v6 03/25] net: dsa: qca8k: improve qca8k read/write/rmw bus access Ansuel Smith
2021-05-14 22:53 ` Russell King (Oracle)
2021-05-14 20:59 ` Ansuel Smith [this message]
2021-05-14 22:55 ` [PATCH net-next v6 04/25] net: dsa: qca8k: handle qca8k_set_page errors Russell King (Oracle)
2021-05-14 20:59 ` [PATCH net-next v6 05/25] net: dsa: qca8k: handle error with qca8k_read operation Ansuel Smith
2021-05-14 23:01 ` Russell King (Oracle)
2021-05-14 20:59 ` [PATCH net-next v6 06/25] net: dsa: qca8k: handle error with qca8k_write operation Ansuel Smith
2021-05-14 20:59 ` [PATCH net-next v6 07/25] net: dsa: qca8k: handle error with qca8k_rmw operation Ansuel Smith
2021-05-14 20:59 ` [PATCH net-next v6 08/25] net: dsa: qca8k: handle error from qca8k_busy_wait Ansuel Smith
2021-05-14 20:59 ` [PATCH net-next v6 09/25] net: dsa: qca8k: add support for qca8327 switch Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 10/25] devicetree: net: dsa: qca8k: Document new compatible qca8327 Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 11/25] net: dsa: qca8k: add priority tweak to qca8337 switch Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 12/25] net: dsa: qca8k: limit port5 delay to qca8337 Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 13/25] net: dsa: qca8k: add GLOBAL_FC settings needed for qca8327 Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 14/25] net: dsa: qca8k: add support for switch rev Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 15/25] net: dsa: qca8k: add ethernet-ports fallback to setup_mdio_bus Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 16/25] net: dsa: qca8k: make rgmii delay configurable Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 17/25] net: dsa: qca8k: clear MASTER_EN after phy read/write Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 18/25] net: dsa: qca8k: dsa: qca8k: protect MASTER busy_wait with mdio mutex Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 19/25] net: dsa: qca8k: enlarge mdio delay and timeout Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 20/25] net: dsa: qca8k: add support for internal phy and internal mdio Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 21/25] devicetree: bindings: dsa: qca8k: Document internal mdio definition Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 22/25] net: dsa: qca8k: improve internal mdio read/write bus access Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 23/25] net: dsa: qca8k: pass switch_revision info to phy dev_flags Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 24/25] net: phy: at803x: clean whitespace errors Ansuel Smith
2021-05-14 21:00 ` [PATCH net-next v6 25/25] net: phy: add support for qca8k switch internal PHY in at803x Ansuel Smith
2021-05-14 22:40 ` [PATCH net-next v6 00/25] Multiple improvement to qca8k stability patchwork-bot+netdevbpf
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