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Revert "cifs: No need to send SIGKILL to demux_thread during umount"

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This reverts commit 52a3624444.

Causes rmmod to fail for at least 7 seconds after unmount which
makes automated testing a little harder when reloading cifs.ko
between test runs.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
CC: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Steve French 2014-09-16 04:16:19 -05:00
parent da80659d4a
commit a5c3e1c725
1 changed files with 19 additions and 0 deletions
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19
fs/cifs/connect.c
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@ -837,6 +837,7 @@ cifs_demultiplex_thread(void *p)
struct TCP_Server_Info *server = p;
unsigned int pdu_length;
char *buf = NULL;
struct task_struct *task_to_wake = NULL;
struct mid_q_entry *mid_entry;
current->flags |= PF_MEMALLOC;
@ -927,7 +928,19 @@ cifs_demultiplex_thread(void *p)
if (server->smallbuf) /* no sense logging a debug message if NULL */
cifs_small_buf_release(server->smallbuf);
task_to_wake = xchg(&server->tsk, NULL);
clean_demultiplex_info(server);
/* if server->tsk was NULL then wait for a signal before exiting */
if (!task_to_wake) {
set_current_state(TASK_INTERRUPTIBLE);
while (!signal_pending(current)) {
schedule();
set_current_state(TASK_INTERRUPTIBLE);
}
set_current_state(TASK_RUNNING);
}
module_put_and_exit(0);
}
@ -2050,6 +2063,8 @@ cifs_find_tcp_session(struct smb_vol *vol)
static void
cifs_put_tcp_session(struct TCP_Server_Info *server)
{
struct task_struct *task;
spin_lock(&cifs_tcp_ses_lock);
if (--server->srv_count > 0) {
spin_unlock(&cifs_tcp_ses_lock);
@ -2073,6 +2088,10 @@ cifs_put_tcp_session(struct TCP_Server_Info *server)
kfree(server->session_key.response);
server->session_key.response = NULL;
server->session_key.len = 0;
task = xchg(&server->tsk, NULL);
if (task)
force_sig(SIGKILL, task);
}
static struct TCP_Server_Info *