Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755137Ab3GYH7l (ORCPT ); Thu, 25 Jul 2013 03:59:41 -0400 Received: from rtits2.realtek.com ([60.250.210.242]:42019 "EHLO rtits2.realtek.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751745Ab3GYH7h (ORCPT ); Thu, 25 Jul 2013 03:59:37 -0400 X-SpamFilter-By: BOX Solutions SpamTrap 5.34 with qID r6P7xWko016948, This message is accepted by code: ctaloc0852 From: Hayes Wang To: CC: , , , Hayes Wang Subject: [PATCH v2 1/3] net/usb/r815x: replace USB buffer from stack to DMA-able Date: Thu, 25 Jul 2013 15:59:02 +0800 Message-ID: <1374739144-732-1-git-send-email-hayeswang@realtek.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <20130724.174947.452272360732442554.davem@davemloft.net> References: <20130724.174947.452272360732442554.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2590 Lines: 102 Some USB buffers use stack which may not be DMA-able. Use the buffers from kmalloc to replace those one. Signed-off-by: Hayes Wang --- drivers/net/usb/r815x.c | 44 +++++++++++++++++++++++++++----------------- 1 file changed, 27 insertions(+), 17 deletions(-) diff --git a/drivers/net/usb/r815x.c b/drivers/net/usb/r815x.c index 8523922..e9b99ba 100644 --- a/drivers/net/usb/r815x.c +++ b/drivers/net/usb/r815x.c @@ -24,34 +24,43 @@ static int pla_read_word(struct usb_device *udev, u16 index) { - int data, ret; + int ret; u8 shift = index & 2; - __le32 ocp_data; + __le32 *tmp; + + tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); + if (!tmp) + return -ENOMEM; index &= ~3; ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), RTL815x_REQ_GET_REGS, RTL815x_REQT_READ, - index, MCU_TYPE_PLA, &ocp_data, sizeof(ocp_data), - 500); + index, MCU_TYPE_PLA, tmp, sizeof(*tmp), 500); if (ret < 0) - return ret; + goto out2; - data = __le32_to_cpu(ocp_data); - data >>= (shift * 8); - data &= 0xffff; + ret = __le32_to_cpu(*tmp); + ret >>= (shift * 8); + ret &= 0xffff; - return data; +out2: + kfree(tmp); + return ret; } static int pla_write_word(struct usb_device *udev, u16 index, u32 data) { - __le32 ocp_data; + __le32 *tmp; u32 mask = 0xffff; u16 byen = BYTE_EN_WORD; u8 shift = index & 2; int ret; + tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); + if (!tmp) + return -ENOMEM; + data &= mask; if (shift) { @@ -63,19 +72,20 @@ static int pla_write_word(struct usb_device *udev, u16 index, u32 data) ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), RTL815x_REQ_GET_REGS, RTL815x_REQT_READ, - index, MCU_TYPE_PLA, &ocp_data, sizeof(ocp_data), - 500); + index, MCU_TYPE_PLA, tmp, sizeof(*tmp), 500); if (ret < 0) - return ret; + goto out3; - data |= __le32_to_cpu(ocp_data) & ~mask; - ocp_data = __cpu_to_le32(data); + data |= __le32_to_cpu(*tmp) & ~mask; + *tmp = __cpu_to_le32(data); ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), RTL815x_REQ_SET_REGS, RTL815x_REQT_WRITE, - index, MCU_TYPE_PLA | byen, &ocp_data, - sizeof(ocp_data), 500); + index, MCU_TYPE_PLA | byen, tmp, sizeof(*tmp), + 500); +out3: + kfree(tmp); return ret; } -- 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/