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[13/14] drivers: net: dsa: qca8k: protect MASTER busy_wait with mdio mutex

Message ID 20210423014741.11858-14-ansuelsmth@gmail.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series Multiple improvement to qca8k stability | expand

Checks

Context Check Description
netdev/tree_selection success Guessing tree name failed - patch did not apply

Commit Message

Christian Marangi April 23, 2021, 1:47 a.m. UTC 
MDIO_MASTER operation have a dedicated busy wait that is not protected
by the mdio mutex. This can cause situation where the MASTER operation
is done and a normal operation is executed between the MASTER read/write
and the MASTER busy_wait. Rework the qca8k_mdio_read/write function to
address this issue by binding the lock for the whole MASTER operation
and not only the mdio read/write common operation.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
 drivers/net/dsa/qca8k.c | 59 ++++++++++++++++++++++++++++++++++-------
 1 file changed, 50 insertions(+), 9 deletions(-)

Comments

Andrew Lunn April 23, 2021, 12:53 p.m. UTC | #1 
On Fri, Apr 23, 2021 at 03:47:39AM +0200, Ansuel Smith wrote:
> MDIO_MASTER operation have a dedicated busy wait that is not protected
> by the mdio mutex. This can cause situation where the MASTER operation
> is done and a normal operation is executed between the MASTER read/write
> and the MASTER busy_wait. Rework the qca8k_mdio_read/write function to
> address this issue by binding the lock for the whole MASTER operation
> and not only the mdio read/write common operation.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
> ---
>  drivers/net/dsa/qca8k.c | 59 ++++++++++++++++++++++++++++++++++-------
>  1 file changed, 50 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
> index 88a0234f1a7b..d2f5e0b1c721 100644
> --- a/drivers/net/dsa/qca8k.c
> +++ b/drivers/net/dsa/qca8k.c
> @@ -609,9 +609,33 @@ qca8k_port_to_phy(int port)
>  	return port - 1;
>  }
>  
> +static int
> +qca8k_mdio_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask)
> +{
> +	unsigned long timeout;
> +	u16 r1, r2, page;
> +
> +	qca8k_split_addr(reg, &r1, &r2, &page);
> +
> +	timeout = jiffies + msecs_to_jiffies(20);
> +
> +	/* loop until the busy flag has cleared */
> +	do {
> +		u32 val = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
> +		int busy = val & mask;
> +
> +		if (!busy)
> +			break;
> +		cond_resched();
> +	} while (!time_after_eq(jiffies, timeout));
> +
> +	return time_after_eq(jiffies, timeout);

You should really be returning -ETIMEDOUT here on error.

    Andrew
diff mbox series

Patch

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 88a0234f1a7b..d2f5e0b1c721 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -609,9 +609,33 @@  qca8k_port_to_phy(int port)
 	return port - 1;
 }
 
+static int
+qca8k_mdio_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask)
+{
+	unsigned long timeout;
+	u16 r1, r2, page;
+
+	qca8k_split_addr(reg, &r1, &r2, &page);
+
+	timeout = jiffies + msecs_to_jiffies(20);
+
+	/* loop until the busy flag has cleared */
+	do {
+		u32 val = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
+		int busy = val & mask;
+
+		if (!busy)
+			break;
+		cond_resched();
+	} while (!time_after_eq(jiffies, timeout));
+
+	return time_after_eq(jiffies, timeout);
+}
+
 static int
 qca8k_mdio_write(struct qca8k_priv *priv, int port, u32 regnum, u16 data)
 {
+	u16 r1, r2, page;
 	u32 phy, val;
 	int ret;
 
@@ -627,10 +651,17 @@  qca8k_mdio_write(struct qca8k_priv *priv, int port, u32 regnum, u16 data)
 	      QCA8K_MDIO_MASTER_REG_ADDR(regnum) |
 	      QCA8K_MDIO_MASTER_DATA(data);
 
-	qca8k_write(priv, QCA8K_MDIO_MASTER_CTRL, val);
+	qca8k_split_addr(QCA8K_MDIO_MASTER_CTRL, &r1, &r2, &page);
+
+	mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
+
+	qca8k_set_page(priv->bus, page);
+	qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val);
 
-	ret = qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL,
-			      QCA8K_MDIO_MASTER_BUSY);
+	ret = qca8k_mdio_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL,
+				   QCA8K_MDIO_MASTER_BUSY);
+
+	mutex_unlock(&priv->bus->mdio_lock);
 
 	qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL,
 			QCA8K_MDIO_MASTER_EN);
@@ -641,6 +672,7 @@  qca8k_mdio_write(struct qca8k_priv *priv, int port, u32 regnum, u16 data)
 static int
 qca8k_mdio_read(struct qca8k_priv *priv, int port, u32 regnum)
 {
+	u16 r1, r2, page;
 	u32 phy, val;
 
 	if (regnum >= QCA8K_MDIO_MASTER_MAX_REG)
@@ -654,14 +686,23 @@  qca8k_mdio_read(struct qca8k_priv *priv, int port, u32 regnum)
 	      QCA8K_MDIO_MASTER_READ | QCA8K_MDIO_MASTER_PHY_ADDR(phy) |
 	      QCA8K_MDIO_MASTER_REG_ADDR(regnum);
 
-	qca8k_write(priv, QCA8K_MDIO_MASTER_CTRL, val);
+	qca8k_split_addr(QCA8K_MDIO_MASTER_CTRL, &r1, &r2, &page);
 
-	if (qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL,
-			    QCA8K_MDIO_MASTER_BUSY))
-		return -ETIMEDOUT;
+	mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
+
+	qca8k_set_page(priv->bus, page);
+	qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val);
+
+	if (qca8k_mdio_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL,
+				 QCA8K_MDIO_MASTER_BUSY))
+		val = -ETIMEDOUT;
+	else
+		val = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
+
+	mutex_unlock(&priv->bus->mdio_lock);
 
-	val = (qca8k_read(priv, QCA8K_MDIO_MASTER_CTRL) &
-		QCA8K_MDIO_MASTER_DATA_MASK);
+	if (val >= 0)
+		val &= QCA8K_MDIO_MASTER_DATA_MASK;
 
 	qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL,
 			QCA8K_MDIO_MASTER_EN);