iucv: suspend/resume error msg for left over pathes

During suspend IUCV exploiters have to close their IUCV connections.
When restoring an image, it can be checked if all IUCV pathes had
been closed before the Linux instance was suspended. If not, an
error message is issued to indicate a problem in one of the
used programs exploiting IUCV communication.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
index c833481d32e383439b98504e84a68250d4f9c98e..aabd2388fcce493ad8dd2e8cada8eaa2db65c47a 100644 (file)
--- a/net/iucv/iucv.c
+++ b/net/iucv/iucv.c
@@ -79,6 +79,14 @@ static int iucv_bus_match(struct device *dev, struct device_driver *drv)
        return 0;
 }
 
+enum iucv_pm_states {
+       IUCV_PM_INITIAL = 0,
+       IUCV_PM_FREEZING = 1,
+       IUCV_PM_THAWING = 2,
+       IUCV_PM_RESTORING = 3,
+};
+static enum iucv_pm_states iucv_pm_state;
+
 static int iucv_pm_prepare(struct device *);
 static void iucv_pm_complete(struct device *);
 static int iucv_pm_freeze(struct device *);
@@ -1875,6 +1883,7 @@ static int iucv_pm_freeze(struct device *dev)
 #ifdef CONFIG_PM_DEBUG
        printk(KERN_WARNING "iucv_pm_freeze\n");
 #endif
+       iucv_pm_state = IUCV_PM_FREEZING;
        for_each_cpu_mask_nr(cpu, iucv_irq_cpumask)
                smp_call_function_single(cpu, iucv_block_cpu_almost, NULL, 1);
        if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
@@ -1899,6 +1908,7 @@ static int iucv_pm_thaw(struct device *dev)
 #ifdef CONFIG_PM_DEBUG
        printk(KERN_WARNING "iucv_pm_thaw\n");
 #endif
+       iucv_pm_state = IUCV_PM_THAWING;
        if (!iucv_path_table) {
                rc = iucv_enable();
                if (rc)
@@ -1933,6 +1943,10 @@ static int iucv_pm_restore(struct device *dev)
 #ifdef CONFIG_PM_DEBUG
        printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
 #endif
+       if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
+               pr_warning("Suspending Linux did not completely close all IUCV "
+                       "connections\n");
+       iucv_pm_state = IUCV_PM_RESTORING;
        if (cpus_empty(iucv_irq_cpumask)) {
                rc = iucv_query_maxconn();
                rc = iucv_enable();