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Message-Id: <1274004407-12323-1-git-send-email-baruch@tkos.co.il>
Date: Sun, 16 May 2010 13:06:47 +0300
From: Baruch Siach <baruch@...s.co.il>
To: netdev@...r.kernel.org
Cc: Baruch Siach <baruch@...s.co.il>, stable@...nel.org,
Sascha Hauer <s.hauer@...gutronix.de>,
Ben Dooks <ben-linux@...ff.org>
Subject: [PATCH] dm9000: fix "BUG: spinlock recursion"
dm9000_set_rx_csum and dm9000_hash_table are called from atomic context (in
dm9000_init_dm9000), and from non-atomic context (via ethtool_ops and
net_device_ops respectively). This causes a spinlock recursion BUG. Fix this by
renaming these functions to *_unlocked for the atomic context, and make the
original functions locking wrappers for use in the non-atomic context.
Signed-off-by: Baruch Siach <baruch@...s.co.il>
Cc: stable@...nel.org
Cc: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Ben Dooks <ben-linux@...ff.org>
---
drivers/net/dm9000.c | 38 +++++++++++++++++++++++++++-----------
1 files changed, 27 insertions(+), 11 deletions(-)
diff --git a/drivers/net/dm9000.c b/drivers/net/dm9000.c
index 7f9960f..3556b2c 100644
--- a/drivers/net/dm9000.c
+++ b/drivers/net/dm9000.c
@@ -476,17 +476,13 @@ static uint32_t dm9000_get_rx_csum(struct net_device *dev)
return dm->rx_csum;
}
-static int dm9000_set_rx_csum(struct net_device *dev, uint32_t data)
+static int dm9000_set_rx_csum_unlocked(struct net_device *dev, uint32_t data)
{
board_info_t *dm = to_dm9000_board(dev);
- unsigned long flags;
if (dm->can_csum) {
dm->rx_csum = data;
-
- spin_lock_irqsave(&dm->lock, flags);
iow(dm, DM9000_RCSR, dm->rx_csum ? RCSR_CSUM : 0);
- spin_unlock_irqrestore(&dm->lock, flags);
return 0;
}
@@ -494,6 +490,19 @@ static int dm9000_set_rx_csum(struct net_device *dev, uint32_t data)
return -EOPNOTSUPP;
}
+static int dm9000_set_rx_csum(struct net_device *dev, uint32_t data)
+{
+ board_info_t *dm = to_dm9000_board(dev);
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&dm->lock, flags);
+ ret = dm9000_set_rx_csum_unlocked(dev, data);
+ spin_unlock_irqrestore(&dm->lock, flags);
+
+ return ret;
+}
+
static int dm9000_set_tx_csum(struct net_device *dev, uint32_t data)
{
board_info_t *dm = to_dm9000_board(dev);
@@ -722,7 +731,7 @@ static unsigned char dm9000_type_to_char(enum dm9000_type type)
* Set DM9000 multicast address
*/
static void
-dm9000_hash_table(struct net_device *dev)
+dm9000_hash_table_unlocked(struct net_device *dev)
{
board_info_t *db = netdev_priv(dev);
struct dev_mc_list *mcptr;
@@ -730,12 +739,9 @@ dm9000_hash_table(struct net_device *dev)
u32 hash_val;
u16 hash_table[4];
u8 rcr = RCR_DIS_LONG | RCR_DIS_CRC | RCR_RXEN;
- unsigned long flags;
dm9000_dbg(db, 1, "entering %s\n", __func__);
- spin_lock_irqsave(&db->lock, flags);
-
for (i = 0, oft = DM9000_PAR; i < 6; i++, oft++)
iow(db, oft, dev->dev_addr[i]);
@@ -765,6 +771,16 @@ dm9000_hash_table(struct net_device *dev)
}
iow(db, DM9000_RCR, rcr);
+}
+
+static void
+dm9000_hash_table(struct net_device *dev)
+{
+ board_info_t *db = netdev_priv(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&db->lock, flags);
+ dm9000_hash_table_unlocked(dev);
spin_unlock_irqrestore(&db->lock, flags);
}
@@ -784,7 +800,7 @@ dm9000_init_dm9000(struct net_device *dev)
db->io_mode = ior(db, DM9000_ISR) >> 6; /* ISR bit7:6 keeps I/O mode */
/* Checksum mode */
- dm9000_set_rx_csum(dev, db->rx_csum);
+ dm9000_set_rx_csum_unlocked(dev, db->rx_csum);
/* GPIO0 on pre-activate PHY */
iow(db, DM9000_GPR, 0); /* REG_1F bit0 activate phyxcer */
@@ -811,7 +827,7 @@ dm9000_init_dm9000(struct net_device *dev)
iow(db, DM9000_ISR, ISR_CLR_STATUS); /* Clear interrupt status */
/* Set address filter table */
- dm9000_hash_table(dev);
+ dm9000_hash_table_unlocked(dev);
imr = IMR_PAR | IMR_PTM | IMR_PRM;
if (db->type != TYPE_DM9000E)
--
1.7.1
--
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