aboutsummaryrefslogtreecommitdiffstats
path: root/package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch
diff options
context:
space:
mode:
Diffstat (limited to 'package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch')
-rw-r--r--package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch95
1 files changed, 0 insertions, 95 deletions
diff --git a/package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch b/package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch
deleted file mode 100644
index 384a0be808..0000000000
--- a/package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch
+++ /dev/null
@@ -1,95 +0,0 @@
-From: Stanislaw Gruszka <sgruszka@redhat.com>
-Date: Sun, 2 Nov 2014 13:38:47 +0100
-Subject: [PATCH] rt2x00: do not align payload on modern H/W
-
-RT2800 and newer hardware require padding between header and payload if
-header length is not multiple of 4.
-
-For historical reasons we also align payload to to 4 bytes boundary, but
-such alignment is not needed on modern H/W.
-
-Patch improve performance on embedded CPUs and _possibly_ fixes
-skb_under_panic problems reported from time to time:
-
-https://bugzilla.kernel.org/show_bug.cgi?id=84911
-https://bugzilla.kernel.org/show_bug.cgi?id=72471
-http://marc.info/?l=linux-wireless&m=139108549530402&w=2
-https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1087591
-
-But we can not explain or otherwise confirm the patch fixes this panic
-issue for sure.
-
-Originally-From: Helmut Schaa <helmut.schaa@googlemail.com>
-Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
----
-
---- a/drivers/net/wireless/rt2x00/rt2x00queue.c
-+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
-@@ -158,55 +158,29 @@ void rt2x00queue_align_frame(struct sk_b
- skb_trim(skb, frame_length);
- }
-
--void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
-+/*
-+ * H/W needs L2 padding between the header and the paylod if header size
-+ * is not 4 bytes aligned.
-+ */
-+void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int hdr_len)
- {
-- unsigned int payload_length = skb->len - header_length;
-- unsigned int header_align = ALIGN_SIZE(skb, 0);
-- unsigned int payload_align = ALIGN_SIZE(skb, header_length);
-- unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0;
-+ unsigned int l2pad = (skb->len > hdr_len) ? L2PAD_SIZE(hdr_len) : 0;
-
-- /*
-- * Adjust the header alignment if the payload needs to be moved more
-- * than the header.
-- */
-- if (payload_align > header_align)
-- header_align += 4;
--
-- /* There is nothing to do if no alignment is needed */
-- if (!header_align)
-+ if (!l2pad)
- return;
-
-- /* Reserve the amount of space needed in front of the frame */
-- skb_push(skb, header_align);
--
-- /*
-- * Move the header.
-- */
-- memmove(skb->data, skb->data + header_align, header_length);
--
-- /* Move the payload, if present and if required */
-- if (payload_length && payload_align)
-- memmove(skb->data + header_length + l2pad,
-- skb->data + header_length + l2pad + payload_align,
-- payload_length);
--
-- /* Trim the skb to the correct size */
-- skb_trim(skb, header_length + l2pad + payload_length);
-+ skb_push(skb, l2pad);
-+ memmove(skb->data, skb->data + l2pad, hdr_len);
- }
-
--void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
-+void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int hdr_len)
- {
-- /*
-- * L2 padding is only present if the skb contains more than just the
-- * IEEE 802.11 header.
-- */
-- unsigned int l2pad = (skb->len > header_length) ?
-- L2PAD_SIZE(header_length) : 0;
-+ unsigned int l2pad = (skb->len > hdr_len) ? L2PAD_SIZE(hdr_len) : 0;
-
- if (!l2pad)
- return;
-
-- memmove(skb->data + l2pad, skb->data, header_length);
-+ memmove(skb->data + l2pad, skb->data, hdr_len);
- skb_pull(skb, l2pad);
- }
-