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cxgb4: fix IRQ free race during driver unload 

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: b37987e8db ("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>
This commit is contained in:
Shahjada Abul Husain 2021-07-08 21:51:56 +05:30 committed by David S. Miller
parent c342690411
commit 015fe6fd29
2 changed files with 13 additions and 8 deletions
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18
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
View File

@ -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))

3
drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
View File

@ -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)