[S390] cio: make wait_events interruptible

Make the potentially long blocking wait_event's used by the cio
settle mechanism interruptible.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 366affc..169a277 100644 (file)
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -1016,19 +1016,22 @@ static int css_settle(struct device_driver *drv, void *unused)
        struct css_driver *cssdrv = to_cssdriver(drv);
 
        if (cssdrv->settle)
-               cssdrv->settle();
+               return cssdrv->settle();
        return 0;
 }
 
-static inline void css_complete_work(void)
+static inline int css_complete_work(void)
 {
        int ret;
 
        /* Wait for the evaluation of subchannels to finish. */
-       wait_event(css_eval_wq, atomic_read(&css_eval_scheduled) == 0);
+       ret = wait_event_interruptible(css_eval_wq,
+                                      atomic_read(&css_eval_scheduled) == 0);
+       if (ret)
+               return -EINTR;
        flush_workqueue(cio_work_q);
        /* Wait for the subchannel type specific initialization to finish */
-       ret = bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle);
+       return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle);
 }
 
 
@@ -1049,10 +1052,13 @@ subsys_initcall_sync(channel_subsystem_init_sync);
 static ssize_t cio_settle_write(struct file *file, const char __user *buf,
                                size_t count, loff_t *ppos)
 {
+       int ret;
+
        /* Handle pending CRW's. */
        crw_wait_for_channel_report();
-       css_complete_work();
-       return count;
+       ret = css_complete_work();
+
+       return ret ? ret : count;
 }
 
 static const struct file_operations cio_settle_proc_fops = {

diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index e05525d..325d813 100644 (file)
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -95,7 +95,7 @@ struct css_driver {
        int (*freeze)(struct subchannel *);
        int (*thaw) (struct subchannel *);
        int (*restore)(struct subchannel *);
-       void (*settle)(void);
+       int (*settle)(void);
        const char *name;
 };
 

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 9c9ea45..6aa2f06 100644 (file)
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -158,11 +158,16 @@ static int io_subchannel_prepare(struct subchannel *sch)
        return 0;
 }
 
-static void io_subchannel_settle(void)
+static int io_subchannel_settle(void)
 {
-       wait_event(ccw_device_init_wq,
-                  atomic_read(&ccw_device_init_count) == 0);
+       int ret;
+
+       ret = wait_event_interruptible(ccw_device_init_wq,
+                               atomic_read(&ccw_device_init_count) == 0);
+       if (ret)
+               return -EINTR;
        flush_workqueue(cio_work_q);
+       return 0;
 }
 
 static struct css_driver io_subchannel_driver = {