Re: [PATCH] usb: xhci: fix length check in xhci_align_td

[Henry Lin <henryl@nvidia.com>]

Similar change is posted in https://marc.info/?l=linux-usb&m=156152916509643&w=2
________________________________________
From: Lorenzo Bianconi <lorenzo@kernel.org>
Sent: Friday, July 5, 2019 2:33 AM
To: linux-usb@vger.kernel.org
Cc: Henry Lin; gregkh@linuxfoundation.org; mathias.nyman@linux.intel.com; lorenzo.bianconi@redhat.com; nbd@nbd.name; sgruszka@redhat.com
Subject: [PATCH] usb: xhci: fix length check in xhci_align_td

Fix the following warning due to a wrong length check after
sg_pcopy_to_buffer in xhci_align_td

xhci_hcd 0000:00:04.0: WARN Wrong bounce buffer write length: 158 != 284
xhci_hcd 0000:00:04.0: WARN Wrong bounce buffer write length: 234 != 158
xhci_hcd 0000:00:04.0: WARN Wrong bounce buffer write length: 208 != 234
xhci_hcd 0000:00:04.0: WARN Wrong bounce buffer write length: 82 != 208

Fixes: 597c56e372da ("xhci: update bounce buffer with correct sg num")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/usb/host/xhci-ring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 121782e22c01..72fc6980c641 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -3177,7 +3177,7 @@ static int xhci_align_td(struct xhci_hcd *xhci, struct urb *urb, u32 enqd_len,
        if (usb_urb_dir_out(urb)) {
                len = sg_pcopy_to_buffer(urb->sg, urb->num_sgs,
                                   seg->bounce_buf, new_buff_len, enqd_len);
-               if (len != seg->bounce_len)
+               if (len != new_buff_len)
                        xhci_warn(xhci,
                                "WARN Wrong bounce buffer write length: %zu != %d\n",
                                len, seg->bounce_len);
--
2.21.0

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