From: Steven Rostedt (Red Hat) <rostedt@goodmis.org>
Date: Fri, 1 Mar 2013 01:03:06 +0000 (-0500)
Subject: tracing: Do not block on splice if either file or splice NONBLOCK flag is set
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=189e5784f6c5e001a84127b83f03bc76a8bfb1ec;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

tracing: Do not block on splice if either file or splice NONBLOCK flag is set

Currently only the splice NONBLOCK flag is checked to determine if
the splice read should block or not. But the file descriptor NONBLOCK
flag also needs to be checked.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ab3df804fa9..598a7aa7d0a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4593,7 +4593,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
 
 	/* did we read anything? */
 	if (!spd.nr_pages) {
-		if (flags & SPLICE_F_NONBLOCK)
+		if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK))
 			ret = -EAGAIN;
 		else
 			ret = 0;