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[93.35.189.2]) by smtp.googlemail.com with ESMTPSA id f4sm10967597wrz.33.2021.05.07.17.29.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 May 2021 17:29:24 -0700 (PDT) From: Ansuel Smith To: Florian Fainelli Cc: Ansuel Smith , Andrew Lunn , Vivien Didelot , Vladimir Oltean , "David S. Miller" , Jakub Kicinski , Russell King , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH net-next v4 07/28] net: dsa: qca8k: handle qca8k_set_page errors Date: Sat, 8 May 2021 02:28:57 +0200 Message-Id: <20210508002920.19945-7-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210508002920.19945-1-ansuelsmth@gmail.com> References: <20210508002920.19945-1-ansuelsmth@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC 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 Reviewed-by: Andrew Lunn --- 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 f58d4543ef1e..1c52d1b262f1 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;