USB: fsl_usb2_udc: fix potential queue head corruption

Clear next TD field and status field in queue head initialization code
to prevent unpredictable result caused by residue of usb reset.

Signed-off-by: Li Yang <leoli@freescale.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_usb2_udc.c
index f3c6703cffda3c700399f8352f2ed5bf76530b6f..d8d9a52a44b34e5a517c3a8dd923478e3b88b198 100644 (file)
--- a/drivers/usb/gadget/fsl_usb2_udc.c
+++ b/drivers/usb/gadget/fsl_usb2_udc.c
@@ -404,7 +404,10 @@ static void struct_ep_qh_setup(struct fsl_udc *udc, unsigned char ep_num,
        }
        if (zlt)
                tmp |= EP_QUEUE_HEAD_ZLT_SEL;
+
        p_QH->max_pkt_length = cpu_to_le32(tmp);
+       p_QH->next_dtd_ptr = 1;
+       p_QH->size_ioc_int_sts = 0;
 
        return;
 }