From: Shahjada Abul Husain shahjada@chelsio.com
[ Upstream commit 015fe6fd29c4b9ac0f61b8c4455ef88e6018b9cc ]
IRQs are requested during driver's ndo_open() and then later freed up in disable_interrupts() during driver unload. A race exists where driver can set the CXGB4_FULL_INIT_DONE flag in ndo_open() after the disable_interrupts() in driver unload path checks it, and hence misses calling free_irq().
Fix by unregistering netdevice first and sync with driver's ndo_open(). This ensures disable_interrupts() checks the flag correctly and frees up the IRQs properly.
Fixes: b37987e8db5f ("cxgb4: Disable interrupts and napi before unregistering netdev") Signed-off-by: Shahjada Abul Husain shahjada@chelsio.com Signed-off-by: Raju Rangoju rajur@chelsio.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- .../net/ethernet/chelsio/cxgb4/cxgb4_main.c | 18 ++++++++++-------- drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c | 3 +++ 2 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c index 8be525c5e2e4..6698afad4379 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c @@ -2643,6 +2643,9 @@ static void detach_ulds(struct adapter *adap) { unsigned int i;
+ if (!is_uld(adap)) + return; + mutex_lock(&uld_mutex); list_del(&adap->list_node);
@@ -7145,10 +7148,13 @@ static void remove_one(struct pci_dev *pdev) */ destroy_workqueue(adapter->workq);
- if (is_uld(adapter)) { - detach_ulds(adapter); - t4_uld_clean_up(adapter); - } + detach_ulds(adapter); + + for_each_port(adapter, i) + if (adapter->port[i]->reg_state == NETREG_REGISTERED) + unregister_netdev(adapter->port[i]); + + t4_uld_clean_up(adapter);
adap_free_hma_mem(adapter);
@@ -7156,10 +7162,6 @@ static void remove_one(struct pci_dev *pdev)
cxgb4_free_mps_ref_entries(adapter);
- for_each_port(adapter, i) - if (adapter->port[i]->reg_state == NETREG_REGISTERED) - unregister_netdev(adapter->port[i]); - debugfs_remove_recursive(adapter->debugfs_root);
if (!is_t4(adapter->params.chip)) diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c index 743af9e654aa..17faac715882 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c @@ -581,6 +581,9 @@ void t4_uld_clean_up(struct adapter *adap) { unsigned int i;
+ if (!is_uld(adap)) + return; + mutex_lock(&uld_mutex); for (i = 0; i < CXGB4_ULD_MAX; i++) { if (!adap->uld[i].handle)