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cxgb4: fix BUG() on interrupt deallocating path of ULD 

Since the introduction of ULD (Upper-Layer Drivers), the MSI-X
deallocating path changed in cxgb4: the driver frees the interrupts
of ULD when unregistering it or on shutdown PCI handler.

Problem is that if a MSI-X is not freed before deallocated in the PCI
layer, it will trigger a BUG() due to still "alive" interrupt being
tentatively quiesced.

The below trace was observed when doing a simple unbind of Chelsio's
adapter PCI function, like:
  "echo 001e:80:00.4 > /sys/bus/pci/drivers/cxgb4/unbind"

Trace:

  kernel BUG at drivers/pci/msi.c:352!
  Oops: Exception in kernel mode, sig: 5 [#1]
  ...
  NIP [c0000000005a5e60] free_msi_irqs+0xa0/0x250
  LR [c0000000005a5e50] free_msi_irqs+0x90/0x250
  Call Trace:
  [c0000000005a5e50] free_msi_irqs+0x90/0x250 (unreliable)
  [c0000000005a72c4] pci_disable_msix+0x124/0x180
  [d000000011e06708] disable_msi+0x88/0xb0 [cxgb4]
  [d000000011e06948] free_some_resources+0xa8/0x160 [cxgb4]
  [d000000011e06d60] remove_one+0x170/0x3c0 [cxgb4]
  [c00000000058a910] pci_device_remove+0x70/0x110
  [c00000000064ef04] device_release_driver_internal+0x1f4/0x2c0
  ...

This patch fixes the issue by refactoring the shutdown path of ULD on
cxgb4 driver, by properly freeing and disabling interrupts on PCI
remove handler too.

Fixes: 0fbc81b3ad ("Allocate resources dynamically for all cxgb4 ULD's")
Reported-by: Harsha Thyagaraja <hathyaga@in.ibm.com>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guilherme G. Piccoli 2017-07-10 10:55:46 -03:00 committed by David S. Miller
parent 91d1ae475b
commit 6a146f3a58
2 changed files with 36 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
View File

@ -2083,12 +2083,12 @@ static void detach_ulds(struct adapter *adap)
mutex_lock(&uld_mutex);
list_del(&adap->list_node);
for (i = 0; i < CXGB4_ULD_MAX; i++)
if (adap->uld && adap->uld[i].handle) {
if (adap->uld && adap->uld[i].handle)
adap->uld[i].state_change(adap->uld[i].handle,
CXGB4_STATE_DETACH);
adap->uld[i].handle = NULL;
}
if (netevent_registered && list_empty(&adapter_list)) {
unregister_netevent_notifier(&cxgb4_netevent_nb);
netevent_registered = false;
@ -5303,8 +5303,10 @@ static void remove_one(struct pci_dev *pdev)
*/
destroy_workqueue(adapter->workq);
if (is_uld(adapter))
if (is_uld(adapter)) {
detach_ulds(adapter);
t4_uld_clean_up(adapter);
}
disable_interrupts(adapter);
@ -5385,7 +5387,11 @@ static void shutdown_one(struct pci_dev *pdev)
if (adapter->port[i]->reg_state == NETREG_REGISTERED)
cxgb_close(adapter->port[i]);
t4_uld_clean_up(adapter);
if (is_uld(adapter)) {
detach_ulds(adapter);
t4_uld_clean_up(adapter);
}
disable_interrupts(adapter);
disable_msi(adapter);

42
drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
View File

@ -589,22 +589,37 @@ void t4_uld_mem_free(struct adapter *adap)
kfree(adap->uld);
}
/* This function should be called with uld_mutex taken. */
static void cxgb4_shutdown_uld_adapter(struct adapter *adap, enum cxgb4_uld type)
{
if (adap->uld[type].handle) {
adap->uld[type].handle = NULL;
adap->uld[type].add = NULL;
release_sge_txq_uld(adap, type);
if (adap->flags & FULL_INIT_DONE)
quiesce_rx_uld(adap, type);
if (adap->flags & USING_MSIX)
free_msix_queue_irqs_uld(adap, type);
free_sge_queues_uld(adap, type);
free_queues_uld(adap, type);
}
}
void t4_uld_clean_up(struct adapter *adap)
{
unsigned int i;
if (!adap->uld)
return;
mutex_lock(&uld_mutex);
for (i = 0; i < CXGB4_ULD_MAX; i++) {
if (!adap->uld[i].handle)
continue;
if (adap->flags & FULL_INIT_DONE)
quiesce_rx_uld(adap, i);
if (adap->flags & USING_MSIX)
free_msix_queue_irqs_uld(adap, i);
free_sge_queues_uld(adap, i);
free_queues_uld(adap, i);
cxgb4_shutdown_uld_adapter(adap, i);
}
mutex_unlock(&uld_mutex);
}
static void uld_init(struct adapter *adap, struct cxgb4_lld_info *lld)
@ -783,15 +798,8 @@ int cxgb4_unregister_uld(enum cxgb4_uld type)
continue;
if (type == CXGB4_ULD_ISCSIT && is_t4(adap->params.chip))
continue;
adap->uld[type].handle = NULL;
adap->uld[type].add = NULL;
release_sge_txq_uld(adap, type);
if (adap->flags & FULL_INIT_DONE)
quiesce_rx_uld(adap, type);
if (adap->flags & USING_MSIX)
free_msix_queue_irqs_uld(adap, type);
free_sge_queues_uld(adap, type);
free_queues_uld(adap, type);
cxgb4_shutdown_uld_adapter(adap, type);
}
mutex_unlock(&uld_mutex);