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[PATCH] ibmasm driver: correctly wake up sleeping threads

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Due to my incomplete understanding of the wait_event_interruptible() function
threads waiting for service processor events were not woken up.  This patch
fixes that problem.

Signed-off-by: Max Asbock <masbock@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Max Asbock
2005-06-21 17:16:33 -07:00
committed by Linus Torvalds
parent f5ccc84231
commit b8acb80846
3 changed files with 40 additions and 14 deletions
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18
drivers/misc/ibmasm/event.c
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@@ -23,6 +23,7 @@
*/
#include "ibmasm.h"
#include "lowlevel.h"
/*
* ASM service processor event handling routines.
@@ -34,7 +35,6 @@
* circular buffer.
*/
static void wake_up_event_readers(struct service_processor *sp)
{
struct event_reader *reader;
@@ -63,7 +63,7 @@ void ibmasm_receive_event(struct service_processor *sp, void *data, unsigned int
spin_lock_irqsave(&sp->lock, flags);
/* copy the event into the next slot in the circular buffer */
event = &buffer->events[buffer->next_index];
memcpy(event->data, data, data_size);
memcpy_fromio(event->data, data, data_size);
event->data_size = data_size;
event->serial_number = buffer->next_serial_number;
@@ -93,7 +93,10 @@ int ibmasm_get_next_event(struct service_processor *sp, struct event_reader *rea
unsigned int index;
unsigned long flags;
if (wait_event_interruptible(reader->wait, event_available(buffer, reader)))
reader->cancelled = 0;
if (wait_event_interruptible(reader->wait,
event_available(buffer, reader) || reader->cancelled))
return -ERESTARTSYS;
if (!event_available(buffer, reader))
@@ -116,6 +119,12 @@ int ibmasm_get_next_event(struct service_processor *sp, struct event_reader *rea
return event->data_size;
}
void ibmasm_cancel_next_event(struct event_reader *reader)
{
reader->cancelled = 1;
wake_up_interruptible(&reader->wait);
}
void ibmasm_event_reader_register(struct service_processor *sp, struct event_reader *reader)
{
unsigned long flags;
@@ -131,8 +140,6 @@ void ibmasm_event_reader_unregister(struct service_processor *sp, struct event_r
{
unsigned long flags;
wake_up_interruptible(&reader->wait);
spin_lock_irqsave(&sp->lock, flags);
list_del(&reader->node);
spin_unlock_irqrestore(&sp->lock, flags);
@@ -164,6 +171,5 @@ int ibmasm_event_buffer_init(struct service_processor *sp)
void ibmasm_event_buffer_exit(struct service_processor *sp)
{
wake_up_event_readers(sp);
kfree(sp->event_buffer);
}