3 files changed, 8 insertions, 9 deletions

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 0c527d2..c68dc29 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -2405,8 +2405,7 @@ static inline void drbd_md_flush(struct drbd_conf *mdev)
 	if (test_bit(MD_NO_FUA, &mdev->flags))
 		return;
 
-	r = blkdev_issue_flush(mdev->ldev->md_bdev, GFP_KERNEL, NULL,
-			BLKDEV_IFL_WAIT);
+	r = blkdev_issue_flush(mdev->ldev->md_bdev, GFP_KERNEL, NULL);
 	if (r) {
 		set_bit(MD_NO_FUA, &mdev->flags);
 		dev_err(DEV, "meta data flush failed with status %d, disabling md-flushes\n", r);
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index d7072bf..2e4df47 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -32,7 +32,7 @@
 #include <asm/types.h>
 #include <net/sock.h>
 #include <linux/ctype.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/fs.h>
 #include <linux/file.h>
 #include <linux/proc_fs.h>
@@ -64,6 +64,7 @@ struct after_state_chg_work {
 	struct completion *done;
 };
 
+static DEFINE_MUTEX(drbd_main_mutex);
 int drbdd_init(struct drbd_thread *);
 int drbd_worker(struct drbd_thread *);
 int drbd_asender(struct drbd_thread *);
@@ -2689,7 +2690,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
 	unsigned long flags;
 	int rv = 0;
 
-	lock_kernel();
+	mutex_lock(&drbd_main_mutex);
 	spin_lock_irqsave(&mdev->req_lock, flags);
 	/* to have a stable mdev->state.role
 	 * and no race with updating open_cnt */
@@ -2704,7 +2705,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
 	if (!rv)
 		mdev->open_cnt++;
 	spin_unlock_irqrestore(&mdev->req_lock, flags);
-	unlock_kernel();
+	mutex_unlock(&drbd_main_mutex);
 
 	return rv;
 }
@@ -2712,9 +2713,9 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
 static int drbd_release(struct gendisk *gd, fmode_t mode)
 {
 	struct drbd_conf *mdev = gd->private_data;
-	lock_kernel();
+	mutex_lock(&drbd_main_mutex);
 	mdev->open_cnt--;
-	unlock_kernel();
+	mutex_unlock(&drbd_main_mutex);
 	return 0;
 }
 
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 2952c12..d299fe9 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -972,7 +972,7 @@ static void drbd_flush(struct drbd_conf *mdev)
 
 	if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) {
 		rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL,
-					NULL, BLKDEV_IFL_WAIT);
+					NULL);
 		if (rv) {
 			dev_err(DEV, "local disk flush failed with status %d\n", rv);
 			/* would rather check on EOPNOTSUPP, but that is not reliable.
@@ -2920,7 +2920,6 @@ static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
 	 * we still need to figure out whether we accept that. */
 	mdev->p_size = p_size;
 
-#define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
 	if (get_ldev(mdev)) {
 		warn_if_differ_considerably(mdev, "lower level device sizes",
 			   p_size, drbd_get_max_capacity(mdev->ldev));