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authorMikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>2008-04-01 01:22:45 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-01 11:16:04 -0700
commitcabce28ec0a0ae3d0ddfa4461f0e8be94ade9e46 (patch)
treed40f357c77bf99a33b9b81123b2c3149adf3717d
parenta9edadbf790d72adf6ebed476cb5caf7743e7e4a (diff)
downloadlinux-sh-cabce28ec0a0ae3d0ddfa4461f0e8be94ade9e46.tar.gz
plip: replace spin_lock_irq with spin_lock_irqsave in irq context
Plip uses spin_lock_irq/spin_unlock_irq in its IRQ handler (called from parport IRQ handler), the latter enables interrupts without parport subsystem IRQ handler expecting it. The bug can be seen if you compile kernel with lock dependency checking and use plip --- it produces a warning. This patch changes it to spin_lock_irqsave/spin_lock_irqrestore, so that it doesn't enable interrupts when already disabled. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/net/plip.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/net/plip.c b/drivers/net/plip.c
index fee3d7b1feba..1e965427b0e9 100644
--- a/drivers/net/plip.c
+++ b/drivers/net/plip.c
@@ -903,17 +903,18 @@ plip_interrupt(void *dev_id)
struct net_local *nl;
struct plip_local *rcv;
unsigned char c0;
+ unsigned long flags;
nl = netdev_priv(dev);
rcv = &nl->rcv_data;
- spin_lock_irq (&nl->lock);
+ spin_lock_irqsave (&nl->lock, flags);
c0 = read_status(dev);
if ((c0 & 0xf8) != 0xc0) {
if ((dev->irq != -1) && (net_debug > 1))
printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name);
- spin_unlock_irq (&nl->lock);
+ spin_unlock_irqrestore (&nl->lock, flags);
return;
}
@@ -942,7 +943,7 @@ plip_interrupt(void *dev_id)
break;
}
- spin_unlock_irq(&nl->lock);
+ spin_unlock_irqrestore(&nl->lock, flags);
}
static int