[PATCH] v9fs: handle kthread_create failure, minor bugfixes
- remove unnecessary -ENOMEM assignments
- return correct value when buf_check_size for second time in a buffer
- handle failures when create_workqueue and kthread_create are called
- use kzalloc instead of kmalloc/memset 0
- v9fs_str_copy and v9fs_str_compare were buggy, were used only in one
place, correct the logic and move it to the place it is used.
Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Cc: Eric Van Hensbergen <ericvh@ericvh.myip.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/9p/mux.c b/fs/9p/mux.c
index f21cf50..945cb36 100644
--- a/fs/9p/mux.c
+++ b/fs/9p/mux.c
@@ -102,8 +102,6 @@
wait_queue_head_t wqueue;
};
-extern int v9fs_errstr2errno(char *str, int len);
-
static int v9fs_poll_proc(void *);
static void v9fs_read_work(void *);
static void v9fs_write_work(void *);
@@ -119,7 +117,7 @@
static int v9fs_mux_poll_task_num;
static struct v9fs_mux_poll_task v9fs_mux_poll_tasks[100];
-void v9fs_mux_global_init(void)
+int v9fs_mux_global_init(void)
{
int i;
@@ -127,6 +125,10 @@
v9fs_mux_poll_tasks[i].task = NULL;
v9fs_mux_wq = create_workqueue("v9fs");
+ if (!v9fs_mux_wq)
+ return -ENOMEM;
+
+ return 0;
}
void v9fs_mux_global_exit(void)
@@ -156,10 +158,11 @@
return n;
}
-static void v9fs_mux_poll_start(struct v9fs_mux_data *m)
+static int v9fs_mux_poll_start(struct v9fs_mux_data *m)
{
int i, n;
struct v9fs_mux_poll_task *vpt, *vptlast;
+ struct task_struct *pproc;
dprintk(DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, v9fs_mux_num,
v9fs_mux_poll_task_num);
@@ -171,13 +174,16 @@
if (v9fs_mux_poll_tasks[i].task == NULL) {
vpt = &v9fs_mux_poll_tasks[i];
dprintk(DEBUG_MUX, "create proc %p\n", vpt);
- vpt->task =
- kthread_create(v9fs_poll_proc, vpt,
+ pproc = kthread_create(v9fs_poll_proc, vpt,
"v9fs-poll");
- INIT_LIST_HEAD(&vpt->mux_list);
- vpt->muxnum = 0;
- v9fs_mux_poll_task_num++;
- wake_up_process(vpt->task);
+
+ if (!IS_ERR(pproc)) {
+ vpt->task = pproc;
+ INIT_LIST_HEAD(&vpt->mux_list);
+ vpt->muxnum = 0;
+ v9fs_mux_poll_task_num++;
+ wake_up_process(vpt->task);
+ }
break;
}
}
@@ -207,16 +213,21 @@
}
if (i >= ARRAY_SIZE(v9fs_mux_poll_tasks)) {
+ if (vptlast == NULL)
+ return -ENOMEM;
+
dprintk(DEBUG_MUX, "put in proc %d\n", i);
list_add(&m->mux_list, &vptlast->mux_list);
vptlast->muxnum++;
- m->poll_task = vpt;
+ m->poll_task = vptlast;
memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
init_poll_funcptr(&m->pt, v9fs_pollwait);
}
v9fs_mux_num++;
down(&v9fs_mux_task_lock);
+
+ return 0;
}
static void v9fs_mux_poll_stop(struct v9fs_mux_data *m)
@@ -283,7 +294,10 @@
INIT_WORK(&m->wq, v9fs_write_work, m);
m->wsched = 0;
memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
- v9fs_mux_poll_start(m);
+ m->poll_task = NULL;
+ n = v9fs_mux_poll_start(m);
+ if (n)
+ return ERR_PTR(n);
n = trans->poll(trans, &m->pt);
if (n & POLLIN) {