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| author | Max Asbock <masbock@us.ibm.com> | 2005-06-21 17:16:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-21 19:07:34 -0700 |
| commit | b8acb808468a88a188d7c5aba3681c583a5785f9 (patch) | |
| tree | 7a4e5367e05cc52bc8008baaa8c35ed05989ec60 /drivers/misc/ibmasm/event.c | |
| parent | f5ccc842318efcd7c05dee3203dfdbbafae47bd6 (diff) | |
| download | kernel_samsung_smdk4412-b8acb808468a88a188d7c5aba3681c583a5785f9.zip kernel_samsung_smdk4412-b8acb808468a88a188d7c5aba3681c583a5785f9.tar.gz kernel_samsung_smdk4412-b8acb808468a88a188d7c5aba3681c583a5785f9.tar.bz2 | |
[PATCH] ibmasm driver: correctly wake up sleeping threads
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>
Diffstat (limited to 'drivers/misc/ibmasm/event.c')
| -rw-r--r-- | drivers/misc/ibmasm/event.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/misc/ibmasm/event.c b/drivers/misc/ibmasm/event.c index e100f34..fe1e819 100644 --- a/drivers/misc/ibmasm/event.c +++ b/drivers/misc/ibmasm/event.c @@ -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); } |