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dm9000: fix "BUG: spinlock recursion"

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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@tkos.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Baruch Siach 2010-05-17 17:45:48 -07:00 committed by David S. Miller
parent 5476b8b225
commit 380fefb2dd
1 changed files with 27 additions and 11 deletions
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38
drivers/net/dm9000.c
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@ -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 netdev_hw_addr *ha;
@ -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)