workqueue: Remove cpus_read_lock() from apply_wqattrs_lock()

1726a17 ("workqueue: Put PWQ allocation and WQ enlistment in the same
lock C.S.") led to the following possible deadlock:

  WARNING: possible recursive locking detected
  6.10.0-rc5-00004-g1d4c6111406c #1 Not tainted
   --------------------------------------------
   swapper/0/1 is trying to acquire lock:
   c27760f4 (cpu_hotplug_lock){++++}-{0:0}, at: alloc_workqueue (kernel/workqueue.c:5152 kernel/workqueue.c:5730) 
  
   but task is already holding lock:
   c27760f4 (cpu_hotplug_lock){++++}-{0:0}, at: padata_alloc (kernel/padata.c:1007) 
   ...  
   stack backtrace:
   ...
   cpus_read_lock (include/linux/percpu-rwsem.h:53 kernel/cpu.c:488) 
   alloc_workqueue (kernel/workqueue.c:5152 kernel/workqueue.c:5730) 
   padata_alloc (kernel/padata.c:1007 (discriminator 1)) 
   pcrypt_init_padata (crypto/pcrypt.c:327 (discriminator 1)) 
   pcrypt_init (crypto/pcrypt.c:353) 
   do_one_initcall (init/main.c:1267) 
   do_initcalls (init/main.c:1328 (discriminator 1) init/main.c:1345 (discriminator 1)) 
   kernel_init_freeable (init/main.c:1364) 
   kernel_init (init/main.c:1469) 
   ret_from_fork (arch/x86/kernel/process.c:153) 
   ret_from_fork_asm (arch/x86/entry/entry_32.S:737) 
   entry_INT80_32 (arch/x86/entry/entry_32.S:944) 

This is caused by pcrypt allocating a workqueue while holding
cpus_read_lock(), so workqueue code can't do it again as that can lead to
deadlocks if down_write starts after the first down_read.

The pwq creations and installations have been reworked based on
wq_online_cpumask rather than cpu_online_mask making cpus_read_lock() is
unneeded during wqattrs changes. Fix the deadlock by removing
cpus_read_lock() from apply_wqattrs_lock().

tj: Updated changelog.

Signed-off-by: Lai Jiangshan <[email protected]>
Fixes: 1726a17 ("workqueue: Put PWQ allocation and WQ enlistment in the same lock C.S.")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Tejun Heo <[email protected]>

kernel/workqueue.c

@@ -5113,15 +5113,12 @@ static struct pool_workqueue *alloc_unbound_pwq(struct workqueue_struct *wq,
 
 static void apply_wqattrs_lock(void)
 {
-	/* CPUs should stay stable across pwq creations and installations */
-	cpus_read_lock();
 	mutex_lock(&wq_pool_mutex);
 }
 
 static void apply_wqattrs_unlock(void)
 {
 	mutex_unlock(&wq_pool_mutex);
-	cpus_read_unlock();
 }
 
 /**