8139cp: Prevent dev_close/cp_interrupt race on MTU change

commit:  cb64edb6b89491edfdbae52ba7db9a8b8391d339 upstream

Above commit may introduce a race between cp_interrupt and dev_close
/ change MTU / dev_open up state. Changes cp_interrupt to tolerate
this.  Change spin_locking in cp_interrupt to avoid possible
but unobserved race.

Reported-by: "Francois Romieu" <romieu@fr.zoreil.com>

Tested on virtual hardware, Tx MTU size up to 4096, max tx payload
    was ping -s 4068 for MTU of 4096. No real hardware, need test
    assist.

Signed-off-by: "John Greene" <jogreene@redhat.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: "David Woodhouse" <David.Woodhouse@intel.com>
Tested-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 7 deletions

diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index cb6fc5a743c..5ac93323a40 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -577,28 +577,30 @@ static irqreturn_t cp_interrupt (int irq, void *dev_instance)
 {
         struct net_device *dev = dev_instance;
         struct cp_private *cp;
+        int handled = 0;
         u16 status;
 
         if (unlikely(dev == NULL))
                 return IRQ_NONE;
         cp = netdev_priv(dev);
 
+        spin_lock(&cp->lock);
+
         status = cpr16(IntrStatus);
         if (!status || (status == 0xFFFF))
-                return IRQ_NONE;
+                goto out_unlock;
+
+        handled = 1;
 
         netif_dbg(cp, intr, dev, "intr, status %04x cmd %02x cpcmd %04x\n",
                   status, cpr8(Cmd), cpr16(CpCmd));
 
         cpw16(IntrStatus, status & ~cp_rx_intr_mask);
 
-        spin_lock(&cp->lock);
-
         /* close possible race's with dev_close */
         if (unlikely(!netif_running(dev))) {
                 cpw16(IntrMask, 0);
-                spin_unlock(&cp->lock);
-                return IRQ_HANDLED;
+                goto out_unlock;
         }
 
         if (status & (RxOK | RxErr | RxEmpty | RxFIFOOvr))
@@ -612,7 +614,6 @@ static irqreturn_t cp_interrupt (int irq, void *dev_instance)
         if (status & LinkChg)
                 mii_check_media(&cp->mii_if, netif_msg_link(cp), false);
 
-        spin_unlock(&cp->lock);
 
         if (status & PciErr) {
                 u16 pci_status;
@@ -625,7 +626,10 @@ static irqreturn_t cp_interrupt (int irq, void *dev_instance)
                 /* TODO: reset hardware */
         }
 
-        return IRQ_HANDLED;
+out_unlock:
+        spin_unlock(&cp->lock);
+
+        return IRQ_RETVAL(handled);
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER