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path: root/drivers/s390/cio/crw.c
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Diffstat (limited to 'drivers/s390/cio/crw.c')
-rw-r--r--drivers/s390/cio/crw.c29
1 files changed, 15 insertions, 14 deletions
diff --git a/drivers/s390/cio/crw.c b/drivers/s390/cio/crw.c
index d157665d0e76..425f741a280c 100644
--- a/drivers/s390/cio/crw.c
+++ b/drivers/s390/cio/crw.c
@@ -8,15 +8,16 @@
* Heiko Carstens <heiko.carstens@de.ibm.com>,
*/
-#include <linux/semaphore.h>
#include <linux/mutex.h>
#include <linux/kthread.h>
#include <linux/init.h>
+#include <linux/wait.h>
#include <asm/crw.h>
-static struct semaphore crw_semaphore;
static DEFINE_MUTEX(crw_handler_mutex);
static crw_handler_t crw_handlers[NR_RSCS];
+static atomic_t crw_nr_req = ATOMIC_INIT(0);
+static DECLARE_WAIT_QUEUE_HEAD(crw_handler_wait_q);
/**
* crw_register_handler() - register a channel report word handler
@@ -59,12 +60,14 @@ void crw_unregister_handler(int rsc)
static int crw_collect_info(void *unused)
{
struct crw crw[2];
- int ccode;
+ int ccode, signal;
unsigned int chain;
- int ignore;
repeat:
- ignore = down_interruptible(&crw_semaphore);
+ signal = wait_event_interruptible(crw_handler_wait_q,
+ atomic_read(&crw_nr_req) > 0);
+ if (unlikely(signal))
+ atomic_inc(&crw_nr_req);
chain = 0;
while (1) {
crw_handler_t handler;
@@ -122,25 +125,23 @@ repeat:
/* chain is always 0 or 1 here. */
chain = crw[chain].chn ? chain + 1 : 0;
}
+ if (atomic_dec_and_test(&crw_nr_req))
+ wake_up(&crw_handler_wait_q);
goto repeat;
return 0;
}
void crw_handle_channel_report(void)
{
- up(&crw_semaphore);
+ atomic_inc(&crw_nr_req);
+ wake_up(&crw_handler_wait_q);
}
-/*
- * Separate initcall needed for semaphore initialization since
- * crw_handle_channel_report might be called before crw_machine_check_init.
- */
-static int __init crw_init_semaphore(void)
+void crw_wait_for_channel_report(void)
{
- init_MUTEX_LOCKED(&crw_semaphore);
- return 0;
+ crw_handle_channel_report();
+ wait_event(crw_handler_wait_q, atomic_read(&crw_nr_req) == 0);
}
-pure_initcall(crw_init_semaphore);
/*
* Machine checks for the channel subsystem must be enabled
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