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path: root/drivers/s390/block/dasd.c
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Diffstat (limited to 'drivers/s390/block/dasd.c')
-rw-r--r--drivers/s390/block/dasd.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 5905936c7c6..56df3c5ed38 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;