1 files changed, 7 insertions, 1 deletions

diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index d43e6087badc..67eb93cff699 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -722,8 +722,14 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
         struct backing_dev_info *bdi;
         loff_t size;
 
+        /*
+         * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
+         * to updated it before every ioctl.
+         */
         if (file->f_flags & O_NDELAY)
-                mode |= FMODE_NDELAY_NOW;
+                mode |= FMODE_NDELAY;
+        else
+                mode &= ~FMODE_NDELAY;
 
         switch (cmd) {
         case HDIO_GETGEO: