* [PATCH net] cxgb4: fix IRQ free race during driver unload
@ 2021-07-08 16:21 Raju Rangoju
2021-07-08 20:40 ` patchwork-bot+netdevbpf
0 siblings, 1 reply; 2+ messages in thread
From: Raju Rangoju @ 2021-07-08 16:21 UTC (permalink / raw)
To: netdev; +Cc: davem, kuba, shahjada, rajur
From: Shahjada Abul Husain <shahjada@chelsio.com>
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>
---
drivers/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 9a2b166d651e..dbf9a0e6601d 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);
@@ -7141,10 +7144,13 @@ 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);
@@ -7152,10 +7158,6 @@ 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)
--
2.9.5
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2021-07-08 16:21 [PATCH net] cxgb4: fix IRQ free race during driver unload Raju Rangoju
2021-07-08 20:40 ` patchwork-bot+netdevbpf
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