[PATCH net-next] cnic: call cp->stop_hw() in cnic_start_hw() on allocation failure

[Jon Maxwell <jmaxwell37@gmail.com>]

We recently had a system crash in the cnic module. Vmcore analysis confirmed 
that "ip link up" was executed which failed due to an allocation failure 
because of memory fragmentation. Futher analysis revealed that the cnic irq 
vector was still allocated after the "ip link up" that failed. When 
"ip link down" was executed it called free_msi_irqs() which crashed the system 
because the cnic irq was still inuse.

PANIC: "kernel BUG at drivers/pci/msi.c:411!"

The code execution was:

cnic_netdev_event()
if (event == NETDEV_UP) {
.
.
       ▹       if (!cnic_start_hw(dev))
cnic_start_hw()
calls cnic_cm_open() which failed with -ENOMEM
cnic_start_hw() then took the err1 path:

err1:↩
       cp->free_resc(dev);↩ <---- frees resources but not irq vector
       pci_dev_put(dev->pcidev);↩
       return err;↩
}↩

This returns control back to cnic_netdev_event() but now the cnic irq vector 
is still allocated even although cnic_cm_open() failed. The next 
"ip link down" while trigger the crash. 

The cnic_start_hw() routine is not handling the allocation failure correctly. 
Fix this by checking whether CNIC_DRV_STATE_HANDLES_IRQ flag is set indicating 
that the hardware has been started in cnic_start_hw(). If it has then call 
cp->stop_hw() which frees the cnic irq vector and cnic resources. Otherwise 
just maintain the previous behaviour and free cnic resources. 

I reproduced this by injecting an ENOMEM error into cnic_cm_alloc_mem()s return
code. 

# ip link set dev enpX down
# ip link set dev enpX up <--- hit's allocation failure
# ip link set dev enpX down <--- crashes here

With this patch I confirmed there was no crash in the reproducer.

Signed-off-by: Jon Maxwell <jmaxwell37@gmail.com>
---
 drivers/net/ethernet/broadcom/cnic.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c
index b69dc58..b1d2ac8 100644
--- a/drivers/net/ethernet/broadcom/cnic.c
+++ b/drivers/net/ethernet/broadcom/cnic.c
@@ -5350,7 +5350,10 @@ static int cnic_start_hw(struct cnic_dev *dev)
 	return 0;
 
 err1:
-	cp->free_resc(dev);
+	if (ethdev->drv_state & CNIC_DRV_STATE_HANDLES_IRQ)
+		cp->stop_hw(dev);
+	else
+		cp->free_resc(dev);
 	pci_dev_put(dev->pcidev);
 	return err;
 }
-- 
1.8.3.1