1From 9fcd5003c0363af140a06aba94e62c9e1ea0381e Mon Sep 17 00:00:00 2001
2From: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
3Date: Mon, 11 Jan 2016 16:45:30 +0100
4Subject: [PATCH] Fix fusion: Unknown symbol tasklist_lock (err 0)
5
6Commit 28f6569ab7d0 renamed TREE_PREEMPT_RCU to PREEMPT_RCU in 3.19
7As a result, the code incorrectly falls back to using tasklist_lock
8(which was made private in 2.6.18)
9
10Always use rcu_read_lock on modern kernels.
11
12Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
13---
14 linux/drivers/char/fusion/fusionee.c | 4 ++--
15 1 file changed, 2 insertions(+), 2 deletions(-)
16
17diff --git a/linux/drivers/char/fusion/fusionee.c b/linux/drivers/char/fusion/fusionee.c
18index ef067f5bc831..70cd0a665f98 100644
19--- a/linux/drivers/char/fusion/fusionee.c
20+++ b/linux/drivers/char/fusion/fusionee.c
21@@ -925,7 +925,7 @@ fusionee_kill(FusionDev * dev,
22                if (f != fusionee && (!target || target == f->id)) {
23                     struct task_struct *p;
24
25-#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) || defined(CONFIG_TINY_RCU) || defined(rcu_read_lock)
26+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
27                     rcu_read_lock();
28 #else
29                     read_lock(&tasklist_lock);
30@@ -946,7 +946,7 @@ fusionee_kill(FusionDev * dev,
31                          }
32                     }
33
34-#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) || defined(CONFIG_TINY_RCU) || defined(rcu_read_unlock)
35+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
36                     rcu_read_unlock();
37 #else
38                     read_unlock(&tasklist_lock);
39