Merge branch 'perf/core' into perf/probes

Resolved merge conflict in tools/perf/Makefile

Merge reason: we want to queue up a dependent patch.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 30 insertions, 11 deletions

diff --git a/fs/pipe.c b/fs/pipe.c
index 52c415114838..ae17d026aaa3 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -777,36 +777,55 @@ pipe_rdwr_release(struct inode *inode, struct file *filp)
 static int
 pipe_read_open(struct inode *inode, struct file *filp)
 {
-        /* We could have perhaps used atomic_t, but this and friends
-           below are the only places.  So it doesn't seem worthwhile.  */
+        int ret = -ENOENT;
+
         mutex_lock(&inode->i_mutex);
-        inode->i_pipe->readers++;
+
+        if (inode->i_pipe) {
+                ret = 0;
+                inode->i_pipe->readers++;
+        }
+
         mutex_unlock(&inode->i_mutex);
 
-        return 0;
+        return ret;
 }
 
 static int
 pipe_write_open(struct inode *inode, struct file *filp)
 {
+        int ret = -ENOENT;
+
         mutex_lock(&inode->i_mutex);
-        inode->i_pipe->writers++;
+
+        if (inode->i_pipe) {
+                ret = 0;
+                inode->i_pipe->writers++;
+        }
+
         mutex_unlock(&inode->i_mutex);
 
-        return 0;
+        return ret;
 }
 
 static int
 pipe_rdwr_open(struct inode *inode, struct file *filp)
 {
+        int ret = -ENOENT;
+
         mutex_lock(&inode->i_mutex);
-        if (filp->f_mode & FMODE_READ)
-                inode->i_pipe->readers++;
-        if (filp->f_mode & FMODE_WRITE)
-                inode->i_pipe->writers++;
+
+        if (inode->i_pipe) {
+                ret = 0;
+                if (filp->f_mode & FMODE_READ)
+                        inode->i_pipe->readers++;
+                if (filp->f_mode & FMODE_WRITE)
+                        inode->i_pipe->writers++;
+        }
+
         mutex_unlock(&inode->i_mutex);
 
-        return 0;
+        return ret;
 }
 
 /*