kernel: merge a proposed fix from LKML for fixing infinite data returned by /proc/timer_list

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37484 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 45 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.10/030-timer_list_fix.patch b/target/linux/generic/patches-3.10/030-timer_list_fix.patch
new file mode 100644
index 0000000000..ef3c7988fd
--- /dev/null
+++ b/target/linux/generic/patches-3.10/030-timer_list_fix.patch
@@ -0,0 +1,45 @@
+Patch by: Nathan Zimmer <nzimmer@sgi.com>
+
+Fixes a regression in the commit
+"timer_list: Convert timer list to be a proper seq_file" which causes
+/proc/timer_list to return an infinite amount of data
+
+
+--- a/kernel/time/timer_list.c
++++ b/kernel/time/timer_list.c
+@@ -305,24 +305,26 @@ static void *timer_list_start(struct seq
+ 	if (!*offset) {
+ 		iter->cpu = -1;
+ 		iter->now = ktime_to_ns(ktime_get());
+-	} else if (iter->cpu >= nr_cpu_ids) {
++	} else {
++		iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
++		if (iter->cpu >= nr_cpu_ids) {
+ #ifdef CONFIG_GENERIC_CLOCKEVENTS
+-		if (!iter->second_pass) {
+-			iter->cpu = -1;
+-			iter->second_pass = true;
+-		} else
+-			return NULL;
++			if (!iter->second_pass) {
++				iter->cpu = -1;
++				iter->second_pass = true;
++			} else
++				return NULL;
+ #else
+-		return NULL;
++			return NULL;
+ #endif
++		}
+ 	}
++
+ 	return iter;
+ }
+ 
+ static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
+ {
+-	struct timer_list_iter *iter = file->private;
+-	iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
+ 	++*offset;
+ 	return timer_list_start(file, offset);
+ }