[S390] zcrypt: Use spin_lock_bh in suspend callback

Fix lock dependency warning.

inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
bash/1442 [HC0[0]:SC0[0]:HE1:SE1] takes:
 (&ap_dev->lock){+.?...}, at: [<000003e001280404>] __ap_poll_device+0x40/0x3e8 [ap]
{IN-SOFTIRQ-W} state was registered at:
  [<000000000017f094>] __lock_acquire+0xb78/0x182c
  [<000000000017fe8e>] lock_acquire+0x146/0x178
  [<0000000000549cf2>] _spin_lock+0x5a/0x98
  [<000003e001280404>] __ap_poll_device+0x40/0x3e8 [ap]
  [<000003e001280afe>] ap_poll_all+0xaa/0x1a4 [ap]
  [<000000000014fa82>] tasklet_action+0xfe/0x1f4
  [<0000000000150a56>] __do_softirq+0x116/0x284
  [<0000000000111058>] do_softirq+0xe4/0xe8
  [<00000000001504ba>] irq_exit+0xba/0xd8
  [<00000000003dd04a>] do_IRQ+0x176/0x1fc
  [<000000000011823c>] io_return+0x0/0x8
  [<0000004bfbfd2c0e>] 0x4bfbfd2c0e

Signed-off-by: Felix Beck <felix.beck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index ae9ab240c7f1..85785807acbc 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -648,7 +648,9 @@ static int ap_bus_suspend(struct device *dev, pm_message_t state)
         /* Poll on the device until all requests are finished. */
         do {
                 flags = 0;
+                spin_lock_bh(&ap_dev->lock);
                 __ap_poll_device(ap_dev, &flags);
+                spin_unlock_bh(&ap_dev->lock);
         } while ((flags & 1) || (flags & 2));
 
         ap_device_remove(dev);
@@ -1407,14 +1409,12 @@ static void ap_reset(struct ap_device *ap_dev)
 
 static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags)
 {
-        spin_lock(&ap_dev->lock);
         if (!ap_dev->unregistered) {
                 if (ap_poll_queue(ap_dev, flags))
                         ap_dev->unregistered = 1;
                 if (ap_dev->reset == AP_RESET_DO)
                         ap_reset(ap_dev);
         }
-        spin_unlock(&ap_dev->lock);
         return 0;
 }
 
@@ -1441,7 +1441,9 @@ static void ap_poll_all(unsigned long dummy)
                 flags = 0;
                 spin_lock(&ap_device_list_lock);
                 list_for_each_entry(ap_dev, &ap_device_list, list) {
+                        spin_lock(&ap_dev->lock);
                         __ap_poll_device(ap_dev, &flags);
+                        spin_unlock(&ap_dev->lock);
                 }
                 spin_unlock(&ap_device_list_lock);
         } while (flags & 1);
@@ -1487,7 +1489,9 @@ static int ap_poll_thread(void *data)
                 flags = 0;
                 spin_lock_bh(&ap_device_list_lock);
                 list_for_each_entry(ap_dev, &ap_device_list, list) {
+                        spin_lock(&ap_dev->lock);
                         __ap_poll_device(ap_dev, &flags);
+                        spin_unlock(&ap_dev->lock);
                 }
                 spin_unlock_bh(&ap_device_list_lock);
         }