mwifiex: correction in MSDU padding logic

Padding arithmetic will always work for MSDUs provided first MSDU
ends on 4-byte boundary. Fixing it by making sure that all MSDU ends
on 4-byte boundary.

Signed-off-by: Yogesh Ashok Powar <[email protected]>
Signed-off-by: Amitkumar Karwar <[email protected]>
Signed-off-by: Kiran Divekar <[email protected]>
Signed-off-by: Bing Zhao <[email protected]>
Signed-off-by: John W. Linville <[email protected]>

diff --git a/drivers/net/wireless/mwifiex/11n_aggr.c b/drivers/net/wireless/mwifiex/11n_aggr.c
index 04222f27665ffcb3bd9a2c265e6b5dbb94095caa..395f1bfd41027f788901b62b5ef4621ac019956d 100644 (file)
--- a/drivers/net/wireless/mwifiex/11n_aggr.c
+++ b/drivers/net/wireless/mwifiex/11n_aggr.c
@@ -82,8 +82,8 @@ mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
        /* Add payload */
        memcpy(skb_put(skb_aggr, skb_src->len), skb_src->data, skb_src->len);
 
-       *pad = (((skb_src->len + LLC_SNAP_LEN) & 3)) ? (4 - (((skb_src->len +
-                                                     LLC_SNAP_LEN)) & 3)) : 0;
+       /* Add padding for new MSDU to start from 4 byte boundary */
+       *pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
 
        return skb_aggr->len + *pad;
 }