From: Mike Ditto <[email protected]>
This is to avoid a race, accidentally acknowledging an interrupt that
we didn't notice and won't immediately process. This is based solely
on code inspection; it is not known if there was an actual bug here.
Signed-off-by: David Decotigny <[email protected]>
---
drivers/net/forcedeth.c | 13 ++++++++-----
1 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index 2c176ff..c9bdee6 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -3403,7 +3403,8 @@ static irqreturn_t nv_nic_irq_tx(int foo, void *data)
for (i = 0;; i++) {
events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQ_TX_ALL;
- writel(NVREG_IRQ_TX_ALL, base + NvRegMSIXIrqStatus);
+ writel(events, base + NvRegMSIXIrqStatus);
+ netdev_dbg(dev, "%s: tx irq: %08x\n", dev->name, events);
if (!(events & np->irqmask))
break;
@@ -3514,7 +3515,8 @@ static irqreturn_t nv_nic_irq_rx(int foo, void *data)
for (i = 0;; i++) {
events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQ_RX_ALL;
- writel(NVREG_IRQ_RX_ALL, base + NvRegMSIXIrqStatus);
+ writel(events, base + NvRegMSIXIrqStatus);
+ netdev_dbg(dev, "%s: rx irq: %08x\n", dev->name, events);
if (!(events & np->irqmask))
break;
@@ -3558,7 +3560,8 @@ static irqreturn_t nv_nic_irq_other(int foo, void *data)
for (i = 0;; i++) {
events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQ_OTHER;
- writel(NVREG_IRQ_OTHER, base + NvRegMSIXIrqStatus);
+ writel(events, base + NvRegMSIXIrqStatus);
+ netdev_dbg(dev, "%s: irq: %08x\n", dev->name, events);
if (!(events & np->irqmask))
break;
@@ -3622,10 +3625,10 @@ static irqreturn_t nv_nic_irq_test(int foo, void *data)
if (!(np->msi_flags & NV_MSI_X_ENABLED)) {
events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
- writel(NVREG_IRQ_TIMER, base + NvRegIrqStatus);
+ writel(events & NVREG_IRQ_TIMER, base + NvRegIrqStatus);
} else {
events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
- writel(NVREG_IRQ_TIMER, base + NvRegMSIXIrqStatus);
+ writel(events & NVREG_IRQ_TIMER, base + NvRegMSIXIrqStatus);
}
pci_push(base);
if (!(events & NVREG_IRQ_TIMER))
--
1.7.3.1
From: Mike Ditto <[email protected]>
This adds a few debug messages to indicate whether PCIe interrupts are
signaled with MSI or MSI-X.
Signed-off-by: David Decotigny <[email protected]>
---
drivers/net/forcedeth.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index c9bdee6..e5c5849 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -3745,6 +3745,7 @@ static int nv_request_irq(struct net_device *dev, int intr_test)
writel(0, base + NvRegMSIXMap0);
writel(0, base + NvRegMSIXMap1);
}
+ netdev_info(dev, "forcedeth: MSI-X enabled\n");
}
}
if (ret != 0 && np->msi_flags & NV_MSI_CAPABLE) {
@@ -3766,6 +3767,7 @@ static int nv_request_irq(struct net_device *dev, int intr_test)
writel(0, base + NvRegMSIMap1);
/* enable msi vector 0 */
writel(NVREG_MSI_VECTOR_0_ENABLED, base + NvRegMSIIrqMask);
+ netdev_info(dev, "forcedeth: MSI enabled\n");
}
}
if (ret != 0) {
--
1.7.3.1
From: Salman Qazi <[email protected]>
The race was between del_timer_sync and nv_do_stats_poll called through
nv_get_ethtool_stats. To prevent this, we have to introduce mutual
exclusion between nv_get_ethtool_stats and del_timer_sync. Notice
that we don't put the mutual exclusion in nv_do_stats_poll. That's
because doing so would result in a deadlock, since it is a timer
callback and hence already waited for by timer deletion.
Signed-off-by: David Decotigny <[email protected]>
---
drivers/net/forcedeth.c | 11 ++++++++++-
1 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index e5c5849..3163a2b 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -3921,6 +3921,10 @@ static void nv_poll_controller(struct net_device *dev)
}
#endif
+/* No locking is needed as long as this is in the timer
+ * callback. However, any other callers must call this
+ * function with np->lock held.
+ */
static void nv_do_stats_poll(unsigned long data)
{
struct net_device *dev = (struct net_device *) data;
@@ -4553,12 +4557,17 @@ static int nv_get_sset_count(struct net_device *dev, int sset)
static void nv_get_ethtool_stats(struct net_device *dev, struct ethtool_stats *estats, u64 *buffer)
{
+ unsigned long flags;
struct fe_priv *np = netdev_priv(dev);
+ spin_lock_irqsave(&np->lock, flags);
+
/* update stats */
nv_do_stats_poll((unsigned long)dev);
memcpy(buffer, &np->estats, nv_get_sset_count(dev, ETH_SS_STATS)*sizeof(u64));
+
+ spin_unlock_irqrestore(&np->lock, flags);
}
static int nv_link_test(struct net_device *dev)
@@ -5176,13 +5185,13 @@ static int nv_close(struct net_device *dev)
spin_lock_irq(&np->lock);
np->in_shutdown = 1;
+ del_timer_sync(&np->stats_poll);
spin_unlock_irq(&np->lock);
nv_napi_disable(dev);
synchronize_irq(np->pci_dev->irq);
del_timer_sync(&np->oom_kick);
del_timer_sync(&np->nic_poll);
- del_timer_sync(&np->stats_poll);
netif_stop_queue(dev);
spin_lock_irq(&np->lock);
--
1.7.3.1