diff options
Diffstat (limited to 'drivers/net/tg3.c')
| -rw-r--r-- | drivers/net/tg3.c | 113 |
1 files changed, 66 insertions, 47 deletions
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index ab87bb1893a5..26dcd1c36b30 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -3568,32 +3568,34 @@ static irqreturn_t tg3_interrupt(int irq, void *dev_id) * Reading the PCI State register will confirm whether the * interrupt is ours and will flush the status block. */ - if ((sblk->status & SD_STATUS_UPDATED) || - !(tr32(TG3PCI_PCISTATE) & PCISTATE_INT_NOT_ACTIVE)) { - /* - * Writing any value to intr-mbox-0 clears PCI INTA# and - * chip-internal interrupt pending events. - * Writing non-zero to intr-mbox-0 additional tells the - * NIC to stop sending us irqs, engaging "in-intr-handler" - * event coalescing. - */ - tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW, - 0x00000001); - if (tg3_irq_sync(tp)) + if (unlikely(!(sblk->status & SD_STATUS_UPDATED))) { + if ((tp->tg3_flags & TG3_FLAG_CHIP_RESETTING) || + (tr32(TG3PCI_PCISTATE) & PCISTATE_INT_NOT_ACTIVE)) { + handled = 0; goto out; - sblk->status &= ~SD_STATUS_UPDATED; - if (likely(tg3_has_work(tp))) { - prefetch(&tp->rx_rcb[tp->rx_rcb_ptr]); - netif_rx_schedule(dev); /* schedule NAPI poll */ - } else { - /* No work, shared interrupt perhaps? re-enable - * interrupts, and flush that PCI write - */ - tw32_mailbox_f(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW, - 0x00000000); } - } else { /* shared interrupt */ - handled = 0; + } + + /* + * Writing any value to intr-mbox-0 clears PCI INTA# and + * chip-internal interrupt pending events. + * Writing non-zero to intr-mbox-0 additional tells the + * NIC to stop sending us irqs, engaging "in-intr-handler" + * event coalescing. + */ + tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW, 0x00000001); + if (tg3_irq_sync(tp)) + goto out; + sblk->status &= ~SD_STATUS_UPDATED; + if (likely(tg3_has_work(tp))) { + prefetch(&tp->rx_rcb[tp->rx_rcb_ptr]); + netif_rx_schedule(dev); /* schedule NAPI poll */ + } else { + /* No work, shared interrupt perhaps? re-enable + * interrupts, and flush that PCI write + */ + tw32_mailbox_f(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW, + 0x00000000); } out: return IRQ_RETVAL(handled); @@ -3611,31 +3613,33 @@ static irqreturn_t tg3_interrupt_tagged(int irq, void *dev_id) * Reading the PCI State register will confirm whether the * interrupt is ours and will flush the status block. */ - if ((sblk->status_tag != tp->last_tag) || - !(tr32(TG3PCI_PCISTATE) & PCISTATE_INT_NOT_ACTIVE)) { - /* - * writing any value to intr-mbox-0 clears PCI INTA# and - * chip-internal interrupt pending events. - * writing non-zero to intr-mbox-0 additional tells the - * NIC to stop sending us irqs, engaging "in-intr-handler" - * event coalescing. - */ - tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW, - 0x00000001); - if (tg3_irq_sync(tp)) + if (unlikely(sblk->status_tag == tp->last_tag)) { + if ((tp->tg3_flags & TG3_FLAG_CHIP_RESETTING) || + (tr32(TG3PCI_PCISTATE) & PCISTATE_INT_NOT_ACTIVE)) { + handled = 0; goto out; - if (netif_rx_schedule_prep(dev)) { - prefetch(&tp->rx_rcb[tp->rx_rcb_ptr]); - /* Update last_tag to mark that this status has been - * seen. Because interrupt may be shared, we may be - * racing with tg3_poll(), so only update last_tag - * if tg3_poll() is not scheduled. - */ - tp->last_tag = sblk->status_tag; - __netif_rx_schedule(dev); } - } else { /* shared interrupt */ - handled = 0; + } + + /* + * writing any value to intr-mbox-0 clears PCI INTA# and + * chip-internal interrupt pending events. + * writing non-zero to intr-mbox-0 additional tells the + * NIC to stop sending us irqs, engaging "in-intr-handler" + * event coalescing. + */ + tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW, 0x00000001); + if (tg3_irq_sync(tp)) + goto out; + if (netif_rx_schedule_prep(dev)) { + prefetch(&tp->rx_rcb[tp->rx_rcb_ptr]); + /* Update last_tag to mark that this status has been + * seen. Because interrupt may be shared, we may be + * racing with tg3_poll(), so only update last_tag + * if tg3_poll() is not scheduled. + */ + tp->last_tag = sblk->status_tag; + __netif_rx_schedule(dev); } out: return IRQ_RETVAL(handled); @@ -4823,6 +4827,19 @@ static int tg3_chip_reset(struct tg3 *tp) if (write_op == tg3_write_flush_reg32) tp->write32 = tg3_write32; + /* Prevent the irq handler from reading or writing PCI registers + * during chip reset when the memory enable bit in the PCI command + * register may be cleared. The chip does not generate interrupt + * at this time, but the irq handler may still be called due to irq + * sharing or irqpoll. + */ + tp->tg3_flags |= TG3_FLAG_CHIP_RESETTING; + tp->hw_status->status = 0; + tp->hw_status->status_tag = 0; + tp->last_tag = 0; + smp_mb(); + synchronize_irq(tp->pdev->irq); + /* do the reset */ val = GRC_MISC_CFG_CORECLK_RESET; @@ -4904,6 +4921,8 @@ static int tg3_chip_reset(struct tg3 *tp) pci_restore_state(tp->pdev); + tp->tg3_flags &= ~TG3_FLAG_CHIP_RESETTING; + /* Make sure PCI-X relaxed ordering bit is clear. */ pci_read_config_dword(tp->pdev, TG3PCI_X_CAPS, &val); val &= ~PCIX_CAPS_RELAXED_ORDERING; |