diff -durN linux-4.6.5/drivers/block/floppy.c linux-4.6.5-patched/drivers/block/floppy.c
--- linux-4.6.5/drivers/block/floppy.c	2016-05-16 00:43:13.000000000 +0200
+++ linux-4.6.5-patched/drivers/block/floppy.c	2016-08-01 16:43:54.263703013 +0200
@@ -866,7 +866,7 @@
 }
 
 /* locks the driver */
-static int lock_fdc(int drive)
+static int lock_fdc(int drive, bool interruptible)
 {
 	if (WARN(atomic_read(&usage_count) == 0,
 		 "Trying to lock fdc while usage count=0\n"))
@@ -2173,7 +2173,7 @@
 {
 	int ret;
 
-	if (lock_fdc(drive))
+	if (lock_fdc(drive, true))
 		return -EINTR;
 
 	set_floppy(drive);
@@ -2960,7 +2960,7 @@
 {
 	int ret;
 
-	if (lock_fdc(drive))
+	if (lock_fdc(drive, interruptible))
 		return -EINTR;
 
 	if (arg == FD_RESET_ALWAYS)
@@ -3243,7 +3243,7 @@
 		if (!capable(CAP_SYS_ADMIN))
 			return -EPERM;
 		mutex_lock(&open_lock);
-		if (lock_fdc(drive)) {
+		if (lock_fdc(drive, true)) {
 			mutex_unlock(&open_lock);
 			return -EINTR;
 		}
@@ -3263,7 +3263,7 @@
 	} else {
 		int oldStretch;
 
-		if (lock_fdc(drive))
+		if (lock_fdc(drive, true))
 			return -EINTR;
 		if (cmd != FDDEFPRM) {
 			/* notice a disk change immediately, else
@@ -3349,7 +3349,7 @@
 	if (type)
 		*g = &floppy_type[type];
 	else {
-		if (lock_fdc(drive))
+		if (lock_fdc(drive, false))
 			return -EINTR;
 		if (poll_drive(false, 0) == -EINTR)
 			return -EINTR;
@@ -3433,7 +3433,7 @@
 		if (UDRS->fd_ref != 1)
 			/* somebody else has this drive open */
 			return -EBUSY;
-		if (lock_fdc(drive))
+		if (lock_fdc(drive, true))
 			return -EINTR;
 
 		/* do the actual eject. Fails on
@@ -3445,7 +3445,7 @@
 		process_fd_request();
 		return ret;
 	case FDCLRPRM:
-		if (lock_fdc(drive))
+		if (lock_fdc(drive, true))
 			return -EINTR;
 		current_type[drive] = NULL;
 		floppy_sizes[drive] = MAX_DISK_SIZE << 1;
@@ -3467,7 +3467,7 @@
 		UDP->flags &= ~FTD_MSG;
 		return 0;
 	case FDFMTBEG:
-		if (lock_fdc(drive))
+		if (lock_fdc(drive, true))
 			return -EINTR;
 		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
 			return -EINTR;
@@ -3484,7 +3484,7 @@
 		return do_format(drive, &inparam.f);
 	case FDFMTEND:
 	case FDFLUSH:
-		if (lock_fdc(drive))
+		if (lock_fdc(drive, true))
 			return -EINTR;
 		return invalidate_drive(bdev);
 	case FDSETEMSGTRESH:
@@ -3507,7 +3507,7 @@
 		outparam = UDP;
 		break;
 	case FDPOLLDRVSTAT:
-		if (lock_fdc(drive))
+		if (lock_fdc(drive, true))
 			return -EINTR;
 		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
 			return -EINTR;
@@ -3530,7 +3530,7 @@
 	case FDRAWCMD:
 		if (type)
 			return -EINVAL;
-		if (lock_fdc(drive))
+		if (lock_fdc(drive, true))
 			return -EINTR;
 		set_floppy(drive);
 		i = raw_cmd_ioctl(cmd, (void __user *)param);
@@ -3539,7 +3539,7 @@
 		process_fd_request();
 		return i;
 	case FDTWADDLE:
-		if (lock_fdc(drive))
+		if (lock_fdc(drive, true))
 			return -EINTR;
 		twaddle();
 		process_fd_request();
@@ -3585,7 +3585,7 @@
 		unsigned int type = UDP->cmos;
 		struct floppy_drive_params *params;
 		const char *name = NULL;
-		char temparea[32];
+		static char temparea[32];
 
 		if (type < ARRAY_SIZE(default_drive_params)) {
 			params = &default_drive_params[type].params;
@@ -3596,8 +3596,7 @@
 				allowed_drive_mask &= ~(1 << drive);
 		} else {
 			params = &default_drive_params[0].params;
-			snprintf(temparea, sizeof(temparea),
-				 "unknown type %d (usb?)", type);
+			sprintf(temparea, "unknown type %d (usb?)", type);
 			name = temparea;
 		}
 		if (name) {
@@ -3663,11 +3662,6 @@
 
 	opened_bdev[drive] = bdev;
 
-	if (!(mode & (FMODE_READ|FMODE_WRITE))) {
-		res = -EINVAL;
-		goto out;
-	}
-
 	res = -ENXIO;
 
 	if (!floppy_track_buffer) {
@@ -3711,20 +3705,21 @@
 	if (UFDCS->rawcmd == 1)
 		UFDCS->rawcmd = 2;
 
-	UDRS->last_checked = 0;
-	clear_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
-	check_disk_change(bdev);
-	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
-		goto out;
-	if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags))
-		goto out;
-
-	res = -EROFS;
-
-	if ((mode & FMODE_WRITE) &&
-			!test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
-		goto out;
-
+	if (!(mode & FMODE_NDELAY)) {
+		if (mode & (FMODE_READ|FMODE_WRITE)) {
+			UDRS->last_checked = 0;
+			clear_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
+			check_disk_change(bdev);
+			if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
+				goto out;
+			if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags))
+				goto out;
+		}
+		res = -EROFS;
+		if ((mode & FMODE_WRITE) &&
+		    !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
+			goto out;
+	}
 	mutex_unlock(&open_lock);
 	mutex_unlock(&floppy_mutex);
 	return 0;
@@ -3752,8 +3747,7 @@
 		return DISK_EVENT_MEDIA_CHANGE;
 
 	if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
-		if (lock_fdc(drive))
-			return -EINTR;
+		lock_fdc(drive, false);
 		poll_drive(false, 0);
 		process_fd_request();
 	}
@@ -3852,9 +3846,7 @@
 			 "VFS: revalidate called on non-open device.\n"))
 			return -EFAULT;
 
-		res = lock_fdc(drive);
-		if (res)
-			return res;
+		lock_fdc(drive, false);
 		cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
 		      test_bit(FD_VERIFY_BIT, &UDRS->flags));
 		if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
