From 4c3de5920c486b8eefa6187ee6a181864c161100 Mon Sep 17 00:00:00 2001 From: Jussi Kivilinna Date: Thu, 20 Dec 2012 16:24:43 +0200 Subject: [PATCH] rtlwifi: fix incorrect use of usb_alloc_coherent with usb_control_msg Incorrect use of usb_alloc_coherent memory as input buffer to usb_control_msg can cause problems in arch DMA code, for example kernel BUG at 'arch/arm/include/asm/dma-mapping.h:321' on ARM (linux-3.4). Change _usb_writeN_sync use kmalloc'd buffer instead. Cc: stable@vger.kernel.org Signed-off-by: Jussi Kivilinna Acked-by: Larry Finger Signed-off-by: John W. Linville --- drivers/net/wireless/rtlwifi/usb.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/rtlwifi/usb.c b/drivers/net/wireless/rtlwifi/usb.c index 29f0969e4ba..a3312b7c490 100644 --- a/drivers/net/wireless/rtlwifi/usb.c +++ b/drivers/net/wireless/rtlwifi/usb.c @@ -210,17 +210,16 @@ static void _usb_writeN_sync(struct rtl_priv *rtlpriv, u32 addr, void *data, u16 index = REALTEK_USB_VENQT_CMD_IDX; int pipe = usb_sndctrlpipe(udev, 0); /* write_out */ u8 *buffer; - dma_addr_t dma_addr; - wvalue = (u16)(addr&0x0000ffff); - buffer = usb_alloc_coherent(udev, (size_t)len, GFP_ATOMIC, &dma_addr); + wvalue = (u16)(addr & 0x0000ffff); + buffer = kmalloc(len, GFP_ATOMIC); if (!buffer) return; memcpy(buffer, data, len); usb_control_msg(udev, pipe, request, reqtype, wvalue, index, buffer, len, 50); - usb_free_coherent(udev, (size_t)len, buffer, dma_addr); + kfree(buffer); } static void _rtl_usb_io_handler_init(struct device *dev, -- 2.20.1