If there's are multiple tasks sleeping inside the read routine ever, this is necessary.
diff -Naur -X dontdiff linux-cvs/drivers/oprofile/event_buffer.c linux-me/drivers/oprofile/event_buffer.c
--- linux-cvs/drivers/oprofile/event_buffer.c 2002-12-21 19:18:20.000000000 +0000
+++ linux-me/drivers/oprofile/event_buffer.c 2003-04-29 01:09:35.000000000 +0100
@@ -151,11 +151,15 @@
if (count != max || *offset)
return -EINVAL;
- /* wait for the event buffer to fill up with some data */
wait_event_interruptible(buffer_wait, atomic_read(&buffer_ready));
+
if (signal_pending(current))
return -EINTR;
+ /* can't currently happen */
+ if (!atomic_read(&buffer_ready))
+ return -EAGAIN;
+
down(&buffer_sem);
atomic_set(&buffer_ready, 0);
-
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This archive was generated by hypermail 2b29 : Wed May 07 2003 - 22:00:19 EST