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[93.35.189.2]) by smtp.googlemail.com with ESMTPSA id q12sm2052946ejy.91.2021.05.04.15.29.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 May 2021 15:29:29 -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 v3 04/20] net: dsa: qca8k: handle qca8k_set_page errors Date: Wed, 5 May 2021 00:28:58 +0200 Message-Id: <20210504222915.17206-4-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210504222915.17206-1-ansuelsmth@gmail.com> References: <20210504222915.17206-1-ansuelsmth@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- drivers/net/dsa/qca8k.c | 29 +++++++++++++++++++++++------ 1 file changed, 23 insertions(+), 6 deletions(-) diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c index cdaf9f85a2cb..411b42d38819 100644 --- a/drivers/net/dsa/qca8k.c +++ b/drivers/net/dsa/qca8k.c @@ -127,16 +127,20 @@ 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) { if (page == qca8k_current_page) - return; + return 0; - if (bus->write(bus, 0x18, 0, page) < 0) + if (bus->write(bus, 0x18, 0, page) < 0) { dev_err_ratelimited(&bus->dev, "failed to set qca8k page\n"); + return -EBUSY; + } + qca8k_current_page = page; + return 0; } static u32 @@ -149,9 +153,13 @@ qca8k_read(struct qca8k_priv *priv, u32 reg) mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED); - qca8k_set_page(priv->bus, page); + val = qca8k_set_page(priv->bus, page); + if (val < 0) + goto exit; + val = qca8k_mii_read32(priv->bus, 0x10 | r2, r1); +exit: mutex_unlock(&priv->bus->mdio_lock); return val; @@ -161,14 +169,19 @@ static void qca8k_write(struct qca8k_priv *priv, u32 reg, u32 val) { u16 r1, r2, page; + int ret; qca8k_split_addr(reg, &r1, &r2, &page); mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED); - qca8k_set_page(priv->bus, page); + ret = qca8k_set_page(priv->bus, page); + if (ret < 0) + goto exit; + qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val); +exit: mutex_unlock(&priv->bus->mdio_lock); } @@ -182,12 +195,16 @@ qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 val) mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED); - qca8k_set_page(priv->bus, page); + ret = qca8k_set_page(priv->bus, page); + if (ret < 0) + goto exit; + ret = qca8k_mii_read32(priv->bus, 0x10 | r2, r1); ret &= ~mask; ret |= val; qca8k_mii_write32(priv->bus, 0x10 | r2, r1, ret); +exit: mutex_unlock(&priv->bus->mdio_lock); return ret; -- 2.30.2