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[PATCH] p54: fix beacon template dtim IE corruption

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This patch fixes a regression that sneaked in with 
"[PATCH] p54: re-enable power save feature".
When p54_beacon_format_ie_tim was divided up
and rewritten to use skb_* macros.

Signed-off-by: Christian Lamparter <chunkeey@xxxxxx>
---
diff --git a/drivers/net/wireless/p54/main.c b/drivers/net/wireless/p54/main.c
index 42abf34..c9a0545 100644
--- a/drivers/net/wireless/p54/main.c
+++ b/drivers/net/wireless/p54/main.c
@@ -111,10 +111,6 @@ static int p54_beacon_format_ie_tim(struct sk_buff *skb)
 		return -EINVAL;
 
 	memmove(tim, next, skb_tail_pointer(skb) - next);
-
-	if (dtim_len > 3)
-		skb_trim(skb, skb->len - (dtim_len - 3));
-
 	tim = skb_tail_pointer(skb) - (dtim_len + 2);
 
 	/* add the dummy at the end */
@@ -123,6 +119,10 @@ static int p54_beacon_format_ie_tim(struct sk_buff *skb)
 	tim[2] = 0;
 	tim[3] = dtim_period;
 	tim[4] = 0;
+
+	if (dtim_len > 3)
+		skb_trim(skb, skb->len - (dtim_len - 3));
+
 	return 0;
 }
 
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