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Message-ID: <1254777182.18287@xw6200>
Date: Mon, 5 Oct 2009 14:09:59 -0700
From: "Matt Carlson" <mcarlson@...adcom.com>
To: "Felix Radensky" <felix@...edded-sol.com>
cc: netdev@...r.kernel.org, "Michael Chan" <mchan@...adcom.com>,
andy@...yhouse.net
Subject: [PATCH net-2.6] tg3: Fix phylib locking strategy
Felix, can you verify this solves your problem?
---
Felix Radensky noted that chip resets were generating stack trace dumps.
This is because the driver is attempting to acquire the mdio bus mutex
while holding the tp->lock spinlock. The fix is to change the code such
that every phy access takes the tp->lock spinlock instead.
Signed-off-by: Matt Carlson <mcarlson@...adcom.com>
---
drivers/net/tg3.c | 37 ++++++++++++-------------------------
drivers/net/tg3.h | 1 -
2 files changed, 12 insertions(+), 26 deletions(-)
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index f09bc5d..8afc60e 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -902,11 +902,12 @@ static int tg3_mdio_read(struct mii_bus *bp, int mii_id, int reg)
struct tg3 *tp = bp->priv;
u32 val;
- if (tp->tg3_flags3 & TG3_FLG3_MDIOBUS_PAUSED)
- return -EAGAIN;
+ spin_lock(&tp->lock);
if (tg3_readphy(tp, reg, &val))
- return -EIO;
+ val = -EIO;
+
+ spin_unlock(&tp->lock);
return val;
}
@@ -914,14 +915,16 @@ static int tg3_mdio_read(struct mii_bus *bp, int mii_id, int reg)
static int tg3_mdio_write(struct mii_bus *bp, int mii_id, int reg, u16 val)
{
struct tg3 *tp = bp->priv;
+ u32 ret = 0;
- if (tp->tg3_flags3 & TG3_FLG3_MDIOBUS_PAUSED)
- return -EAGAIN;
+ spin_lock(&tp->lock);
if (tg3_writephy(tp, reg, val))
- return -EIO;
+ ret = -EIO;
- return 0;
+ spin_unlock(&tp->lock);
+
+ return ret;
}
static int tg3_mdio_reset(struct mii_bus *bp)
@@ -1011,12 +1014,6 @@ static void tg3_mdio_config_5785(struct tg3 *tp)
static void tg3_mdio_start(struct tg3 *tp)
{
- if (tp->tg3_flags3 & TG3_FLG3_MDIOBUS_INITED) {
- mutex_lock(&tp->mdio_bus->mdio_lock);
- tp->tg3_flags3 &= ~TG3_FLG3_MDIOBUS_PAUSED;
- mutex_unlock(&tp->mdio_bus->mdio_lock);
- }
-
tp->mi_mode &= ~MAC_MI_MODE_AUTO_POLL;
tw32_f(MAC_MI_MODE, tp->mi_mode);
udelay(80);
@@ -1041,15 +1038,6 @@ static void tg3_mdio_start(struct tg3 *tp)
tg3_mdio_config_5785(tp);
}
-static void tg3_mdio_stop(struct tg3 *tp)
-{
- if (tp->tg3_flags3 & TG3_FLG3_MDIOBUS_INITED) {
- mutex_lock(&tp->mdio_bus->mdio_lock);
- tp->tg3_flags3 |= TG3_FLG3_MDIOBUS_PAUSED;
- mutex_unlock(&tp->mdio_bus->mdio_lock);
- }
-}
-
static int tg3_mdio_init(struct tg3 *tp)
{
int i;
@@ -1141,7 +1129,6 @@ static void tg3_mdio_fini(struct tg3 *tp)
tp->tg3_flags3 &= ~TG3_FLG3_MDIOBUS_INITED;
mdiobus_unregister(tp->mdio_bus);
mdiobus_free(tp->mdio_bus);
- tp->tg3_flags3 &= ~TG3_FLG3_MDIOBUS_PAUSED;
}
}
@@ -6392,8 +6379,6 @@ static int tg3_chip_reset(struct tg3 *tp)
tg3_nvram_lock(tp);
- tg3_mdio_stop(tp);
-
tg3_ape_lock(tp, TG3_APE_LOCK_GRC);
/* No matching tg3_nvram_unlock() after this because
@@ -8698,6 +8683,8 @@ static int tg3_close(struct net_device *dev)
del_timer_sync(&tp->timer);
+ tg3_phy_stop(tp);
+
tg3_full_lock(tp, 1);
#if 0
tg3_dump_state(tp);
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 524691c..bab7940 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2748,7 +2748,6 @@ struct tg3 {
#define TG3_FLG3_5701_DMA_BUG 0x00000008
#define TG3_FLG3_USE_PHYLIB 0x00000010
#define TG3_FLG3_MDIOBUS_INITED 0x00000020
-#define TG3_FLG3_MDIOBUS_PAUSED 0x00000040
#define TG3_FLG3_PHY_CONNECTED 0x00000080
#define TG3_FLG3_RGMII_STD_IBND_DISABLE 0x00000100
#define TG3_FLG3_RGMII_EXT_IBND_RX_EN 0x00000200
--
1.6.4.4
--
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