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authorBen Hutchings <bhutchings@solarflare.com>2010-12-07 19:24:45 +0000
committerBen Hutchings <bhutchings@solarflare.com>2010-12-07 19:30:19 +0000
commit94dec6a2d20a26a779b63bb584e48db5fb0ddb53 (patch)
tree3911c0883429411e27f22db1e34436d75fbb937b /drivers/net/sfc/efx.c
parent46bcf14f44d8f31ecfdc8b6708ec15a3b33316d9 (diff)
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 <bhutchings@solarflare.com>
Diffstat (limited to 'drivers/net/sfc/efx.c')
-rw-r--r--drivers/net/sfc/efx.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
index 05df20e4797..d06cb742164 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);