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authorBen Hutchings <ben@decadent.org.uk>2010-09-06 18:28:56 -0700
committerDavid S. Miller <davem@davemloft.net>2010-09-07 13:57:22 -0700
commit89b12faba4f3441c9457c5278851e8a93ffd008d (patch)
treefa7af4864a3200a7abcadea2a04886515249d326 /drivers/net/3c59x.c
parent1ee89bd0fe72e381c8e4ef887d53c19c8adc6c93 (diff)
3c59x: Fix deadlock in vortex_error()
This fixes a bug introduced in commit de847272149365363a6043a963a6f42fb91566e2 "3c59x: Use fine-grained locks for MII and windowed register access". vortex_interrupt() holds vp->window_lock over multiple register accesses to reduce locking overhead. However it also needs to call vortex_error() sometimes, and that uses the regular functions for access to windowed registers, which will try to acquire window_lock again. Therefore, drop window_lock around the call to vortex_error() and set the window afterward reacquiring the lock. Since vortex_error() may call vortex_rx(), which *does* require its caller to hold window_lock, lift that call up into vortex_interrupt(). This also removes the potential for calling vortex_rx() on a later-generation NIC. Reported-and-tested-by: Jens Schüßler <jgs@trash.net> [in Debian's 2.6.32] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/3c59x.c')
-rw-r--r--drivers/net/3c59x.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index a045559c81c..85671adae45 100644
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -1994,10 +1994,9 @@ vortex_error(struct net_device *dev, int status)
}
}
- if (status & RxEarly) { /* Rx early is unused. */
- vortex_rx(dev);
+ if (status & RxEarly) /* Rx early is unused. */
iowrite16(AckIntr | RxEarly, ioaddr + EL3_CMD);
- }
+
if (status & StatsFull) { /* Empty statistics. */
static int DoneDidThat;
if (vortex_debug > 4)
@@ -2298,7 +2297,12 @@ vortex_interrupt(int irq, void *dev_id)
if (status & (HostError | RxEarly | StatsFull | TxComplete | IntReq)) {
if (status == 0xffff)
break;
+ if (status & RxEarly)
+ vortex_rx(dev);
+ spin_unlock(&vp->window_lock);
vortex_error(dev, status);
+ spin_lock(&vp->window_lock);
+ window_set(vp, 7);
}
if (--work_done < 0) {