Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756235Ab3GWJ0N (ORCPT ); Tue, 23 Jul 2013 05:26:13 -0400 Received: from rtits2.realtek.com ([60.250.210.242]:52578 "EHLO rtits2.realtek.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755119Ab3GWJ0K (ORCPT ); Tue, 23 Jul 2013 05:26:10 -0400 X-SpamFilter-By: BOX Solutions SpamTrap 5.34 with qID r6N9Q4HR029880, This message is accepted by code: ctaloc0852 From: hayeswang To: CC: , , References: Subject: [PATCH 2/3] net/usb/r8152: make sure the USB buffer is DMA-able Date: Tue, 23 Jul 2013 17:26:04 +0800 Message-ID: <210AAC5346804B4C8C3F3CBD25C16EFA@realtek.com.tw> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 Thread-Index: Ac6HhMdOg1BBwFkoQluPEEf34daUngAAAO9Q In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3827 Lines: 126 Allocate the required memory before calling usb_control_msg. And the additional memory copy is necessary. Signed-off-by: Hayes Wang --- drivers/net/usb/r8152.c | 60 ++++++++++++++++++++++++++++--------------------- 1 file changed, 35 insertions(+), 25 deletions(-) diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c index ee13f9e..ef033ab 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -344,17 +344,41 @@ static const int multicast_filter_limit = 32; static int get_registers(struct r8152 *tp, u16 value, u16 index, u16 size, void *data) { - return usb_control_msg(tp->udev, usb_rcvctrlpipe(tp->udev, 0), + int ret; + void *tmp; + + tmp = kmalloc(size, GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + ret = usb_control_msg(tp->udev, usb_rcvctrlpipe(tp->udev, 0), RTL8152_REQ_GET_REGS, RTL8152_REQT_READ, - value, index, data, size, 500); + value, index, tmp, size, 500); + + memcpy(data, tmp, size); + kfree(tmp); + + return ret; } static int set_registers(struct r8152 *tp, u16 value, u16 index, u16 size, void *data) { - return usb_control_msg(tp->udev, usb_sndctrlpipe(tp->udev, 0), + int ret; + void *tmp; + + tmp = kmalloc(size, GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + memcpy(tmp, data, size); + + ret = usb_control_msg(tp->udev, usb_sndctrlpipe(tp->udev, 0), RTL8152_REQ_SET_REGS, RTL8152_REQT_WRITE, - value, index, data, size, 500); + value, index, tmp, size, 500); + + kfree(tmp); + return ret; } static int generic_ocp_read(struct r8152 *tp, u16 index, u16 size, @@ -685,21 +709,14 @@ static void ocp_reg_write(struct r8152 *tp, u16 addr, u16 data) static inline void set_ethernet_addr(struct r8152 *tp) { struct net_device *dev = tp->netdev; - u8 *node_id; + u8 node_id[8] = {0}; - node_id = kmalloc(sizeof(u8) * 8, GFP_KERNEL); - if (!node_id) { - netif_err(tp, probe, dev, "out of memory"); - return; - } - - if (pla_ocp_read(tp, PLA_IDR, sizeof(u8) * 8, node_id) < 0) + if (pla_ocp_read(tp, PLA_IDR, sizeof(node_id), node_id) < 0) netif_notice(tp, probe, dev, "inet addr fail\n"); else { memcpy(dev->dev_addr, node_id, dev->addr_len); memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); } - kfree(node_id); } static int rtl8152_set_mac_address(struct net_device *netdev, void *p) @@ -882,15 +899,10 @@ static void rtl8152_set_rx_mode(struct net_device *netdev) static void _rtl8152_set_rx_mode(struct net_device *netdev) { struct r8152 *tp = netdev_priv(netdev); - u32 tmp, *mc_filter; /* Multicast hash filter */ + u32 mc_filter[2]; /* Multicast hash filter */ + __le32 tmp[2]; u32 ocp_data; - mc_filter = kmalloc(sizeof(u32) * 2, GFP_KERNEL); - if (!mc_filter) { - netif_err(tp, link, netdev, "out of memory"); - return; - } - clear_bit(RTL8152_SET_RX_MODE, &tp->flags); netif_stop_queue(netdev); ocp_data = ocp_read_dword(tp, MCU_TYPE_PLA, PLA_RCR); @@ -918,14 +930,12 @@ static void _rtl8152_set_rx_mode(struct net_device *netdev) } } - tmp = mc_filter[0]; - mc_filter[0] = __cpu_to_le32(swab32(mc_filter[1])); - mc_filter[1] = __cpu_to_le32(swab32(tmp)); + tmp[0] = __cpu_to_le32(swab32(mc_filter[1])); + tmp[1] = __cpu_to_le32(swab32(mc_filter[0])); - pla_ocp_write(tp, PLA_MAR, BYTE_EN_DWORD, sizeof(u32) * 2, mc_filter); + pla_ocp_write(tp, PLA_MAR, BYTE_EN_DWORD, sizeof(tmp), tmp); ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RCR, ocp_data); netif_wake_queue(netdev); - kfree(mc_filter); } static netdev_tx_t rtl8152_start_xmit(struct sk_buff *skb, -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/