From: Seth Forshee Date: Wed, 26 Nov 2014 02:28:24 +0000 (-0600) Subject: xen-netfront: Remove BUGs on paged skb data which crosses a page boundary X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8d609725d4357f499e2103e46011308b32f53513;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git xen-netfront: Remove BUGs on paged skb data which crosses a page boundary These BUGs can be erroneously triggered by frags which refer to tail pages within a compound page. The data in these pages may overrun the hardware page while still being contained within the compound page, but since compound_order() evaluates to 0 for tail pages the assertion fails. The code already iterates through subsequent pages correctly in this scenario, so the BUGs are unnecessary and can be removed. Fixes: f36c374782e4 ("xen/netfront: handle compound page fragments on transmit") Cc: # 3.7+ Signed-off-by: Seth Forshee Reviewed-by: David Vrabel Signed-off-by: David S. Miller --- diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index cca871346a0f..ece8d1804d13 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -496,9 +496,6 @@ static void xennet_make_frags(struct sk_buff *skb, struct netfront_queue *queue, len = skb_frag_size(frag); offset = frag->page_offset; - /* Data must not cross a page boundary. */ - BUG_ON(len + offset > PAGE_SIZE<> PAGE_SHIFT; offset &= ~PAGE_MASK; @@ -506,8 +503,6 @@ static void xennet_make_frags(struct sk_buff *skb, struct netfront_queue *queue, while (len > 0) { unsigned long bytes; - BUG_ON(offset >= PAGE_SIZE); - bytes = PAGE_SIZE - offset; if (bytes > len) bytes = len;