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powerpc/spufs: sputrace: Don't block until the read buffer is full

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Currently, read() on the sputrace buffer will only return data when
the user buffer is exhausted. This may mean that we never see the
end of the event log, unless we read() with exactly the right-sized
buffer.

This change makes sputrace_read not block if we have data ready to
return.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
This commit is contained in:
Jeremy Kerr 2008-10-15 13:20:42 +11:00
parent baf399273f
commit e869446bb6
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/platforms/cell/spufs/sputrace.c
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@ -80,6 +80,11 @@ static ssize_t sputrace_read(struct file *file, char __user *buf,
char tbuf[128];
int width;
/* If we have data ready to return, don't block waiting
* for more */
if (cnt > 0 && sputrace_used() == 0)
break;
error = wait_event_interruptible(sputrace_wait,
sputrace_used() > 0);
if (error)