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[S390] zcrypt: fix possible dead lock in AP bus module

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AP bus module uses bus_for_each_dev() in software interrupt context to
poll for completed requests which might cause dead locks. Solution: use
private AP device list for polling in software interrupt context.

Signed-off-by: Ralph Wuerthner <rwuerthn@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ralph Wuerthner 2007-03-19 13:19:14 +01:00 committed by Martin Schwidefsky
parent fb1c171992
commit cf352ce0b9
2 changed files with 24 additions and 7 deletions
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30
drivers/s390/crypto/ap_bus.c
View file

@ -65,6 +65,8 @@ module_param_named(poll_thread, ap_thread_flag, int, 0000);
MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 1 (on).");
static struct device *ap_root_device = NULL;
static DEFINE_SPINLOCK(ap_device_lock);
static LIST_HEAD(ap_device_list);
/**
* Workqueue & timer for bus rescan.
@ -457,6 +459,9 @@ static int ap_device_probe(struct device *dev)
int rc;
ap_dev->drv = ap_drv;
spin_lock_bh(&ap_device_lock);
list_add(&ap_dev->list, &ap_device_list);
spin_unlock_bh(&ap_device_lock);
rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
return rc;
}
@ -497,6 +502,9 @@ static int ap_device_remove(struct device *dev)
ap_flush_queue(ap_dev);
if (ap_drv->remove)
ap_drv->remove(ap_dev);
spin_lock_bh(&ap_device_lock);
list_del_init(&ap_dev->list);
spin_unlock_bh(&ap_device_lock);
return 0;
}
@ -772,6 +780,7 @@ static void ap_scan_bus(struct work_struct *unused)
spin_lock_init(&ap_dev->lock);
INIT_LIST_HEAD(&ap_dev->pendingq);
INIT_LIST_HEAD(&ap_dev->requestq);
INIT_LIST_HEAD(&ap_dev->list);
if (device_type == 0)
ap_probe_device_type(ap_dev);
else
@ -1033,14 +1042,13 @@ static void ap_poll_timeout(unsigned long unused)
* polling until bit 2^0 of the control flags is not set. If bit 2^1
* of the control flags has been set arm the poll timer.
*/
static int __ap_poll_all(struct device *dev, void *data)
static int __ap_poll_all(struct ap_device *ap_dev, unsigned long *flags)
{
struct ap_device *ap_dev = to_ap_dev(dev);
int rc;
spin_lock(&ap_dev->lock);
if (!ap_dev->unregistered) {
rc = ap_poll_queue(to_ap_dev(dev), (unsigned long *) data);
rc = ap_poll_queue(ap_dev, flags);
if (rc)
ap_dev->unregistered = 1;
} else
@ -1054,10 +1062,15 @@ static int __ap_poll_all(struct device *dev, void *data)
static void ap_poll_all(unsigned long dummy)
{
unsigned long flags;
struct ap_device *ap_dev;
do {
flags = 0;
bus_for_each_dev(&ap_bus_type, NULL, &flags, __ap_poll_all);
spin_lock(&ap_device_lock);
list_for_each_entry(ap_dev, &ap_device_list, list) {
__ap_poll_all(ap_dev, &flags);
}
spin_unlock(&ap_device_lock);
} while (flags & 1);
if (flags & 2)
ap_schedule_poll_timer();
@ -1075,6 +1088,7 @@ static int ap_poll_thread(void *data)
DECLARE_WAITQUEUE(wait, current);
unsigned long flags;
int requests;
struct ap_device *ap_dev;
set_user_nice(current, 19);
while (1) {
@ -1092,10 +1106,12 @@ static int ap_poll_thread(void *data)
set_current_state(TASK_RUNNING);
remove_wait_queue(&ap_poll_wait, &wait);
local_bh_disable();
flags = 0;
bus_for_each_dev(&ap_bus_type, NULL, &flags, __ap_poll_all);
local_bh_enable();
spin_lock_bh(&ap_device_lock);
list_for_each_entry(ap_dev, &ap_device_list, list) {
__ap_poll_all(ap_dev, &flags);
}
spin_unlock_bh(&ap_device_lock);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&ap_poll_wait, &wait);

1
drivers/s390/crypto/ap_bus.h
View file

@ -106,6 +106,7 @@ struct ap_device {
struct device device;
struct ap_driver *drv; /* Pointer to AP device driver. */
spinlock_t lock; /* Per device lock. */
struct list_head list; /* private list of all AP devices. */
ap_qid_t qid; /* AP queue id. */
int queue_depth; /* AP queue depth.*/