From 94dec6a2d20a26a779b63bb584e48db5fb0ddb53 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Tue, 7 Dec 2010 19:24:45 +0000 Subject: sfc: Fix crash in legacy onterrupt handler during ring reallocation If we are using a legacy interrupt, our IRQ may be shared and our interrupt handler may be called even though interrupts are disabled on the NIC. When we change ring sizes, we reallocate the event queue and the interrupt handler may use an invalid pointer when called for another device's interrupt. Maintain a legacy_irq_enabled flag and test that at the top of the interrupt handler. Note that this problem results from the need to work around broken INT_ISR0 reads, and does not affect the legacy interrupt handler for Falcon A1. Signed-off-by: Ben Hutchings --- drivers/net/sfc/efx.c | 12 ++++++++++-- drivers/net/sfc/net_driver.h | 2 ++ drivers/net/sfc/nic.c | 6 ++++++ 3 files changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c index 05df20e47976..d06cb742164b 100644 --- a/drivers/net/sfc/efx.c +++ b/drivers/net/sfc/efx.c @@ -335,8 +335,10 @@ void efx_process_channel_now(struct efx_channel *channel) /* Disable interrupts and wait for ISRs to complete */ efx_nic_disable_interrupts(efx); - if (efx->legacy_irq) + if (efx->legacy_irq) { synchronize_irq(efx->legacy_irq); + efx->legacy_irq_enabled = false; + } if (channel->irq) synchronize_irq(channel->irq); @@ -351,6 +353,8 @@ void efx_process_channel_now(struct efx_channel *channel) efx_channel_processed(channel); napi_enable(&channel->napi_str); + if (efx->legacy_irq) + efx->legacy_irq_enabled = true; efx_nic_enable_interrupts(efx); } @@ -1400,6 +1404,8 @@ static void efx_start_all(struct efx_nic *efx) efx_start_channel(channel); } + if (efx->legacy_irq) + efx->legacy_irq_enabled = true; efx_nic_enable_interrupts(efx); /* Switch to event based MCDI completions after enabling interrupts. @@ -1460,8 +1466,10 @@ static void efx_stop_all(struct efx_nic *efx) /* Disable interrupts and wait for ISR to complete */ efx_nic_disable_interrupts(efx); - if (efx->legacy_irq) + if (efx->legacy_irq) { synchronize_irq(efx->legacy_irq); + efx->legacy_irq_enabled = false; + } efx_for_each_channel(channel, efx) { if (channel->irq) synchronize_irq(channel->irq); diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h index 0a7e26d73b52..b137c889152b 100644 --- a/drivers/net/sfc/net_driver.h +++ b/drivers/net/sfc/net_driver.h @@ -621,6 +621,7 @@ struct efx_filter_state; * @pci_dev: The PCI device * @type: Controller type attributes * @legacy_irq: IRQ number + * @legacy_irq_enabled: Are IRQs enabled on NIC (INT_EN_KER register)? * @workqueue: Workqueue for port reconfigures and the HW monitor. * Work items do not hold and must not acquire RTNL. * @workqueue_name: Name of workqueue @@ -709,6 +710,7 @@ struct efx_nic { struct pci_dev *pci_dev; const struct efx_nic_type *type; int legacy_irq; + bool legacy_irq_enabled; struct workqueue_struct *workqueue; char workqueue_name[16]; struct work_struct reset_work; diff --git a/drivers/net/sfc/nic.c b/drivers/net/sfc/nic.c index 41c36b9a4244..67cb0c96838c 100644 --- a/drivers/net/sfc/nic.c +++ b/drivers/net/sfc/nic.c @@ -1418,6 +1418,12 @@ static irqreturn_t efx_legacy_interrupt(int irq, void *dev_id) u32 queues; int syserr; + /* Could this be ours? If interrupts are disabled then the + * channel state may not be valid. + */ + if (!efx->legacy_irq_enabled) + return result; + /* Read the ISR which also ACKs the interrupts */ efx_readd(efx, ®, FR_BZ_INT_ISR0); queues = EFX_EXTRACT_DWORD(reg, 0, 31); -- cgit v1.2.3