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DM9000: Ensure spinlock held whilst accessing EEPROM registers

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Ensure we hold the spinlock whilst the registers and being
modified even though we hold the overall lock. This should
protect against an interrupt happening whilst we are using
the device.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Ben Dooks 2008-02-05 00:02:14 +00:00 committed by Jeff Garzik
parent 3927f1c88e
commit 621ddcb046
1 changed files with 20 additions and 0 deletions
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20
drivers/net/dm9000.c
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@ -1073,17 +1073,29 @@ dm9000_rx(struct net_device *dev)
static void
dm9000_read_eeprom(board_info_t *db, int offset, u8 *to)
{
unsigned long flags;
mutex_lock(&db->addr_lock);
spin_lock_irqsave(&db->lock, flags);
iow(db, DM9000_EPAR, offset);
iow(db, DM9000_EPCR, EPCR_ERPRR);
spin_unlock_irqrestore(&db->lock, flags);
mdelay(8); /* according to the datasheet 200us should be enough,
but it doesn't work */
spin_lock_irqsave(&db->lock, flags);
iow(db, DM9000_EPCR, 0x0);
to[0] = ior(db, DM9000_EPDRL);
to[1] = ior(db, DM9000_EPDRH);
spin_unlock_irqrestore(&db->lock, flags);
mutex_unlock(&db->addr_lock);
}
@ -1093,14 +1105,22 @@ dm9000_read_eeprom(board_info_t *db, int offset, u8 *to)
static void
dm9000_write_eeprom(board_info_t *db, int offset, u8 *data)
{
unsigned long flags;
mutex_lock(&db->addr_lock);
spin_lock_irqsave(&db->lock, flags);
iow(db, DM9000_EPAR, offset);
iow(db, DM9000_EPDRH, data[1]);
iow(db, DM9000_EPDRL, data[0]);
iow(db, DM9000_EPCR, EPCR_WEP | EPCR_ERPRW);
spin_unlock_irqrestore(&db->lock, flags);
mdelay(8); /* same shit */
spin_lock_irqsave(&db->lock, flags);
iow(db, DM9000_EPCR, 0);
spin_unlock_irqrestore(&db->lock, flags);
mutex_unlock(&db->addr_lock);
}