1 files changed, 12 insertions, 7 deletions

diff --git a/fs/pipe.c b/fs/pipe.c
index 25aa09f9d09d..66aa0b938d6a 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -39,7 +39,11 @@ void pipe_wait(struct inode * inode)
 {
         DEFINE_WAIT(wait);
 
-        prepare_to_wait(PIPE_WAIT(*inode), &wait, TASK_INTERRUPTIBLE);
+        /*
+         * Pipes are system-local resources, so sleeping on them
+         * is considered a noninteractive wait:
+         */
+        prepare_to_wait(PIPE_WAIT(*inode), &wait, TASK_INTERRUPTIBLE|TASK_NONINTERACTIVE);
         up(PIPE_SEM(*inode));
         schedule();
         finish_wait(PIPE_WAIT(*inode), &wait);
@@ -415,6 +419,10 @@ pipe_poll(struct file *filp, poll_table *wait)
 
         if (filp->f_mode & FMODE_WRITE) {
                 mask |= (nrbufs < PIPE_BUFFERS) ? POLLOUT | POLLWRNORM : 0;
+                /*
+                 * Most Unices do not set POLLERR for FIFOs but on Linux they
+                 * behave exactly like pipes for poll().
+                 */
                 if (!PIPE_READERS(*inode))
                         mask |= POLLERR;
         }
@@ -422,9 +430,6 @@ pipe_poll(struct file *filp, poll_table *wait)
         return mask;
 }
 
-/* FIXME: most Unices do not set POLLERR for fifos */
-#define fifo_poll pipe_poll
-
 static int
 pipe_release(struct inode *inode, int decr, int decw)
 {
@@ -568,7 +573,7 @@ struct file_operations read_fifo_fops = {
         .read           = pipe_read,
         .readv          = pipe_readv,
         .write          = bad_pipe_w,
-        .poll           = fifo_poll,
+        .poll           = pipe_poll,
         .ioctl          = pipe_ioctl,
         .open           = pipe_read_open,
         .release        = pipe_read_release,
@@ -580,7 +585,7 @@ struct file_operations write_fifo_fops = {
         .read           = bad_pipe_r,
         .write          = pipe_write,
         .writev         = pipe_writev,
-        .poll           = fifo_poll,
+        .poll           = pipe_poll,
         .ioctl          = pipe_ioctl,
         .open           = pipe_write_open,
         .release        = pipe_write_release,
@@ -593,7 +598,7 @@ struct file_operations rdwr_fifo_fops = {
         .readv          = pipe_readv,
         .write          = pipe_write,
         .writev         = pipe_writev,
-        .poll           = fifo_poll,
+        .poll           = pipe_poll,
         .ioctl          = pipe_ioctl,
         .open           = pipe_rdwr_open,
         .release        = pipe_rdwr_release,