On 12/20/2012 08:24 AM, Jussi Kivilinna wrote:
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: [email protected]
Signed-off-by: Jussi Kivilinna <[email protected]>
---
drivers/net/wireless/rtlwifi/usb.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
Acked-by: Larry Finger <[email protected]>
Thanks. My only test platforms are X86 and PPC-32. Neither showed this problem.
Larry
diff --git a/drivers/net/wireless/rtlwifi/usb.c
b/drivers/net/wireless/rtlwifi/usb.c
index 29f0969..a3312b7 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,
--
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