[S390] dasd: fix online/offline race

Setting a DASD online and offline in quick succession may cause
a kernel panic or let the chhccwdev command wait forever.
The Online process is split into two parts. After the first part
is finished the offline process may be called. This may result
in a situation where the second online processing part tries to
set the DASD offline as well.
Use a mutex to protect online and offline against each other.
Also correct some checking.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 14 insertions, 8 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 5905936c7c60..56df3c5ed385 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -20,6 +20,7 @@
 #include <linux/buffer_head.h>
 #include <linux/hdreg.h>
 #include <linux/async.h>
+#include <linux/mutex.h>
 
 #include <asm/ccwdev.h>
 #include <asm/ebcdic.h>
@@ -112,6 +113,7 @@ struct dasd_device *dasd_alloc_device(void)
         INIT_WORK(&device->restore_device, do_restore_device);
         device->state = DASD_STATE_NEW;
         device->target = DASD_STATE_NEW;
+        mutex_init(&device->state_mutex);
 
         return device;
 }
@@ -484,10 +486,8 @@ static void dasd_change_state(struct dasd_device *device)
         if (rc)
                 device->target = device->state;
 
-        if (device->state == device->target) {
+        if (device->state == device->target)
                 wake_up(&dasd_init_waitq);
-                dasd_put_device(device);
-        }
 
         /* let user-space know that the device status changed */
         kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
@@ -502,7 +502,9 @@ static void dasd_change_state(struct dasd_device *device)
 static void do_kick_device(struct work_struct *work)
 {
         struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
+        mutex_lock(&device->state_mutex);
         dasd_change_state(device);
+        mutex_unlock(&device->state_mutex);
         dasd_schedule_device_bh(device);
         dasd_put_device(device);
 }
@@ -539,18 +541,19 @@ void dasd_restore_device(struct dasd_device *device)
 void dasd_set_target_state(struct dasd_device *device, int target)
 {
         dasd_get_device(device);
+        mutex_lock(&device->state_mutex);
         /* If we are in probeonly mode stop at DASD_STATE_READY. */
         if (dasd_probeonly && target > DASD_STATE_READY)
                 target = DASD_STATE_READY;
         if (device->target != target) {
-                if (device->state == target) {
+                if (device->state == target)
                         wake_up(&dasd_init_waitq);
-                        dasd_put_device(device);
-                }
                 device->target = target;
         }
         if (device->state != device->target)
                 dasd_change_state(device);
+        mutex_unlock(&device->state_mutex);
+        dasd_put_device(device);
 }
 
 /*
@@ -1692,7 +1695,6 @@ int dasd_cancel_req(struct dasd_ccw_req *cqr)
                                 cqr, rc);
                 } else {
                         cqr->stopclk = get_clock();
-                        rc = 1;
                 }
                 break;
         default: /* already finished or clear pending - do nothing */
@@ -2170,9 +2172,13 @@ static void dasd_flush_request_queue(struct dasd_block *block)
 static int dasd_open(struct block_device *bdev, fmode_t mode)
 {
         struct dasd_block *block = bdev->bd_disk->private_data;
-        struct dasd_device *base = block->base;
+        struct dasd_device *base;
         int rc;
 
+        if (!block)
+                return -ENODEV;
+
+        base = block->base;
         atomic_inc(&block->open_count);
         if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
                 rc = -ENODEV;