From: Mathias Nyman Date: Fri, 4 Oct 2019 11:59:26 +0000 (+0300) Subject: xhci: Fix false warning message about wrong bounce buffer write length X-Git-Tag: v4.9.197~51 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1817e62b7775d588fd32545392bd3b8002e5275d;p=thirdparty%2Fkernel%2Fstable.git xhci: Fix false warning message about wrong bounce buffer write length commit c03101ff4f74bb30679c1a03d551ecbef1024bf6 upstream. The check printing out the "WARN Wrong bounce buffer write length:" uses incorrect values when comparing bytes written from scatterlist to bounce buffer. Actual copied lengths are fine. The used seg->bounce_len will be set to equal new_buf_len a few lines later in the code, but is incorrect when doing the comparison. The patch which added this false warning was backported to 4.8+ kernels so this should be backported as far as well. Cc: # v4.8+ Fixes: 597c56e372da ("xhci: update bounce buffer with correct sg num") Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/1570190373-30684-2-git-send-email-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index d2e3917cbd91a..69ad9817076ad 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3200,10 +3200,10 @@ 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); + len, new_buff_len); seg->bounce_dma = dma_map_single(dev, seg->bounce_buf, max_pkt, DMA_TO_DEVICE); } else {