From 7a9ed4898920f98b1c1bd5a05bfb4e0315776e1d Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Sat, 12 Nov 2016 12:46:27 -0200 Subject: [PATCH] gp8psk: fix gp8psk_usb_in_op() logic Commit bc29131ecb10 ("[media] gp8psk: don't do DMA on stack") fixed the usage of DMA on stack, but the memcpy was wrong for gp8psk_usb_in_op(). Fix it. From Derek's email: "Fix confirmed using 2 different Skywalker models with HD mpeg4, SD mpeg2." Suggested-by: Johannes Stezenbach Fixes: bc29131ecb10 ("[media] gp8psk: don't do DMA on stack") Tested-by: Derek Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Linus Torvalds --- drivers/media/usb/dvb-usb/gp8psk.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/dvb-usb/gp8psk.c b/drivers/media/usb/dvb-usb/gp8psk.c index adfd764914517..2829e3082d159 100644 --- a/drivers/media/usb/dvb-usb/gp8psk.c +++ b/drivers/media/usb/dvb-usb/gp8psk.c @@ -67,7 +67,6 @@ int gp8psk_usb_in_op(struct dvb_usb_device *d, u8 req, u16 value, u16 index, u8 return ret; while (ret >= 0 && ret != blen && try < 3) { - memcpy(st->data, b, blen); ret = usb_control_msg(d->udev, usb_rcvctrlpipe(d->udev,0), req, @@ -81,8 +80,10 @@ int gp8psk_usb_in_op(struct dvb_usb_device *d, u8 req, u16 value, u16 index, u8 if (ret < 0 || ret != blen) { warn("usb in %d operation failed.", req); ret = -EIO; - } else + } else { ret = 0; + memcpy(b, st->data, blen); + } deb_xfer("in: req. %x, val: %x, ind: %x, buffer: ",req,value,index); debug_dump(b,blen,deb_xfer); -- 2.39.5