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authorDavid S. Miller <davem@sunset.davemloft.net>2007-07-09 22:40:36 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-16 04:04:05 -0700
commit5a606b72a4309a656cd1a19ad137dc5557c4b8ea (patch)
tree2ca87c1915a2232d1629a56dd9762195bdddf2e6 /arch/sparc64
parent667ef3c3968e4e2ddc3f3f84f05e11fb2453d5b6 (diff)
downloadlinux-2.6.34-ux500-5a606b72a4309a656cd1a19ad137dc5557c4b8ea.tar.gz
[SPARC64]: Do not ACK an INO if it is disabled or inprogress.
This is also a partial workaround for a bug in the LDOM firmware which double-transmits RX inos during high load. Without this, such an event causes the kernel to loop forever in the interrupt call chain ACK'ing but never actually running the IRQ handler (and thus clearing the interrupt condition in the device). There is still a bad potential effect when double INOs occur, not covered by this changeset. Namely, if the INO is already on the per-cpu INO vector list, we still blindly re-insert it and thus we can end up losing interrupts already linked in after it. We could deal with that by traversing the list before insertion, but that's too expensive for this edge case. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/kernel/irq.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 6b6165d36fd..634194e7d2d 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -309,6 +309,10 @@ static void sun4u_irq_disable(unsigned int virt_irq)
static void sun4u_irq_end(unsigned int virt_irq)
{
struct irq_handler_data *data = get_irq_chip_data(virt_irq);
+ struct irq_desc *desc = irq_desc + virt_irq;
+
+ if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+ return;
if (likely(data))
upa_writeq(ICLR_IDLE, data->iclr);
@@ -373,6 +377,10 @@ static void sun4v_irq_end(unsigned int virt_irq)
{
struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
unsigned int ino = bucket - &ivector_table[0];
+ struct irq_desc *desc = irq_desc + virt_irq;
+
+ if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+ return;
if (likely(bucket)) {
int err;
@@ -443,6 +451,10 @@ static void sun4v_virq_end(unsigned int virt_irq)
{
struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
unsigned int ino = bucket - &ivector_table[0];
+ struct irq_desc *desc = irq_desc + virt_irq;
+
+ if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+ return;
if (likely(bucket)) {
unsigned long dev_handle, dev_ino;