diff options
| author | Alistair Popple <alistair@popple.id.au> | 2013-10-30 03:50:38 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-30 06:57:42 +0400 |
| commit | 32663b8b8948cc05f812ab82c1c7db2db3ddf717 (patch) | |
| tree | 7eeb59bbaf203cc541ff11b68473fd6c4c13de77 /drivers/net/ethernet/ibm | |
| parent | b4dfd326c29c241c2bb8463167217eb2438b7c3d (diff) | |
| download | linux-32663b8b8948cc05f812ab82c1c7db2db3ddf717.tar.xz | |
ibm emac: Fix locking for enable/disable eob irq
Calls to mal_enable_eob_irq perform a read-write-modify of a dcr to
enable device irqs which is protected by a spin lock. However calls to
mal_disable_eob_irq do not take the corresponding lock.
This patch resolves the problem by ensuring that calls to
mal_disable_eob_irq also take the lock.
Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/ibm')
| -rw-r--r-- | drivers/net/ethernet/ibm/emac/mal.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ibm/emac/mal.c b/drivers/net/ethernet/ibm/emac/mal.c index 909f9b6698b5..e7847510eda2 100644 --- a/drivers/net/ethernet/ibm/emac/mal.c +++ b/drivers/net/ethernet/ibm/emac/mal.c @@ -263,7 +263,9 @@ static inline void mal_schedule_poll(struct mal_instance *mal) { if (likely(napi_schedule_prep(&mal->napi))) { MAL_DBG2(mal, "schedule_poll" NL); + spin_lock(&mal->lock); mal_disable_eob_irq(mal); + spin_unlock(&mal->lock); __napi_schedule(&mal->napi); } else MAL_DBG2(mal, "already in poll" NL); @@ -445,7 +447,9 @@ static int mal_poll(struct napi_struct *napi, int budget) if (!napi_reschedule(napi)) goto more_work; + spin_lock_irqsave(&mal->lock, flags); mal_disable_eob_irq(mal); + spin_unlock_irqrestore(&mal->lock, flags); goto again; } mc->ops->poll_tx(mc->dev); |