ehea: Fix kernel deadlock in DLPAR-mem processing

Port reset operations and memory add/remove operations need to
be serialized to avoid a kernel deadlock. The deadlock is caused
by calling the napi_disable() function twice.
Therefore we have to employ the dlpar_mem_lock in the ehea_reset_port
function as well

Signed-off-by: Jan-Bernd Themann <themann@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 6 deletions

diff --git a/drivers/net/ehea/ehea.h b/drivers/net/ehea/ehea.h
index 0630980a2722..0060e422f171 100644
--- a/drivers/net/ehea/ehea.h
+++ b/drivers/net/ehea/ehea.h
@@ -40,7 +40,7 @@
 #include <asm/io.h>
 
 #define DRV_NAME        "ehea"
-#define DRV_VERSION     "EHEA_0103"
+#define DRV_VERSION     "EHEA_0105"
 
 /* eHEA capability flags */
 #define DLPAR_PORT_ADD_REM 1
diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index fd890faf5174..8b92acb448c2 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -2860,6 +2860,7 @@ static void ehea_reset_port(struct work_struct *work)
                 container_of(work, struct ehea_port, reset_task);
         struct net_device *dev = port->netdev;
 
+        mutex_lock(&dlpar_mem_lock);
         port->resets++;
         mutex_lock(&port->port_lock);
         netif_stop_queue(dev);
@@ -2882,6 +2883,7 @@ static void ehea_reset_port(struct work_struct *work)
         netif_wake_queue(dev);
 out:
         mutex_unlock(&port->port_lock);
+        mutex_unlock(&dlpar_mem_lock);
 }
 
 static void ehea_rereg_mrs(struct work_struct *work)
@@ -3543,10 +3545,7 @@ static int ehea_mem_notifier(struct notifier_block *nb,
         int ret = NOTIFY_BAD;
         struct memory_notify *arg = data;
 
-        if (!mutex_trylock(&dlpar_mem_lock)) {
-                ehea_info("ehea_mem_notifier must not be called parallelized");
-                goto out;
-        }
+        mutex_lock(&dlpar_mem_lock);
 
         switch (action) {
         case MEM_CANCEL_OFFLINE:
@@ -3575,7 +3574,6 @@ static int ehea_mem_notifier(struct notifier_block *nb,
 
 out_unlock:
         mutex_unlock(&dlpar_mem_lock);
-out:
         return ret;
 }