commit 091f1a10614db89a108cda980425799730d73d8a
author Jack Steiner <steiner@sgi.com> Tue Dec 15 16:48:02 2009 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> Wed Dec 16 07:20:14 2009 -0800
tree 1564f5eec330225cc652c9c89209d84898a7c653
parent 827f02febfcdfb03bc056bf479a13b5bcb35dfd7

gru: add comments raised in previous code reviews

Add comments from previous code reviews.  The comments help explain some
of the more esoteric aspects of the driver.

Move a free() to the other side of an unlock.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/misc/sgi-gru/grufault.c

diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index 679e017..2605edf 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -733,6 +733,11 @@
 	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
 		return -EFAULT;
 
+	/*
+	 * The library creates arrays of contexts for threaded programs.
+	 * If no gts exists in the array, the context has never been used & all
+	 * statistics are implicitly 0.
+	 */
 	gts = gru_find_lock_gts(req.gseg);
 	if (gts) {
 		memcpy(&req.stats, &gts->ustats, sizeof(gts->ustats));