xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

bcache: Allocation kthread fixes

Browse Source 
The alloc kthread should've been using try_to_freeze() - and also there
was the potential for the alloc kthread to get woken up after it had
shut down, which would have been bad.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
2013-07-10 18:31:58 -07:00
parent 29ebf465b9
commit 79826c35eb
3 changed files with 15 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/md/bcache/alloc.c
View File

@@ -63,6 +63,7 @@
#include "bcache.h"
#include "btree.h"
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/random.h>
#include <trace/events/bcache.h>
@@ -363,11 +364,10 @@ do { \
break; \
\
mutex_unlock(&(ca)->set->bucket_lock); \
if (test_bit(CACHE_SET_STOPPING_2, &ca->set->flags)) { \
closure_put(&ca->set->cl); \
if (kthread_should_stop()) \
return 0; \
} \
\
try_to_freeze(); \
schedule(); \
mutex_lock(&(ca)->set->bucket_lock); \
} \
@@ -547,14 +547,12 @@ int bch_bucket_alloc_set(struct cache_set *c, unsigned watermark,
int bch_cache_allocator_start(struct cache *ca)
{
ca->alloc_thread = kthread_create(bch_allocator_thread,
ca, "bcache_allocator");
if (IS_ERR(ca->alloc_thread))
return PTR_ERR(ca->alloc_thread);
closure_get(&ca->set->cl);
wake_up_process(ca->alloc_thread);
struct task_struct *k = kthread_run(bch_allocator_thread,
ca, "bcache_allocator");
if (IS_ERR(k))
return PTR_ERR(k);
ca->alloc_thread = k;
return 0;
}