This patch adds a flag "no_skb_reserve" in struct eth_dev. So, if a peripheral driver sets the quirk_avoids_skb_reserve flag, upper network gadget drivers (e.g. f_ncm.c) can avoid skb_reserve() calling using the flag as well.
Signed-off-by: Yoshihiro Shimoda <[email protected]> --- drivers/usb/gadget/function/u_ether.c | 5 ++++- drivers/usb/gadget/function/u_ether.h | 1 + 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c index 5f562c1..3be4b93 100644 --- a/drivers/usb/gadget/function/u_ether.c +++ b/drivers/usb/gadget/function/u_ether.c @@ -82,6 +82,7 @@ struct eth_dev { #define WORK_RX_MEMORY 0 bool zlp; + bool no_skb_reserve; u8 host_mac[ETH_ALEN]; u8 dev_mac[ETH_ALEN]; }; @@ -233,7 +234,8 @@ rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags) * but on at least one, checksumming fails otherwise. Note: * RNDIS headers involve variable numbers of LE32 values. */ - skb_reserve(skb, NET_IP_ALIGN); + if (likely(!dev->no_skb_reserve)) + skb_reserve(skb, NET_IP_ALIGN); req->buf = skb->data; req->length = size; @@ -1063,6 +1065,7 @@ struct net_device *gether_connect(struct gether *link) if (result == 0) { dev->zlp = link->is_zlp_ok; + dev->no_skb_reserve = link->no_skb_reserve; DBG(dev, "qlen %d\n", qlen(dev->gadget, dev->qmult)); dev->header_len = link->header_len; diff --git a/drivers/usb/gadget/function/u_ether.h b/drivers/usb/gadget/function/u_ether.h index c77145b..81d94a7 100644 --- a/drivers/usb/gadget/function/u_ether.h +++ b/drivers/usb/gadget/function/u_ether.h @@ -64,6 +64,7 @@ struct gether { struct usb_ep *out_ep; bool is_zlp_ok; + bool no_skb_reserve; u16 cdc_filter; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
