package/mac80211/patches/601-rt2x00-fix-hang-on-ifdown.patch

   1 From 27ed5ec6924c17b76d65b697a162bafee7bd8e4e Mon Sep 17 00:00:00 2001
   2 From: Helmut Schaa <helmut.schaa@googlemail.com>
   3 Date: Mon, 21 Jun 2010 10:03:05 +0200
   4 Subject: [PATCH] rt2x00: fix rt2800pci hang on ifdown
   5
   6 rt2800pci hangs the system on rt305x SoC devices on ifdown. Work around
   7 this issue by disabling TX DMA prior to resetting the TX queue indices.
   8
   9 This patch is not suitable for upstream inclusion but is just meant as
  10 a workaround until a proper solution is implemented.
  11
  12 Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
  13 ---
  14  drivers/net/wireless/rt2x00/rt2800pci.c |    4 ++++
  15  1 files changed, 4 insertions(+), 0 deletions(-)
  16
  17 --- a/drivers/net/wireless/rt2x00/rt2800pci.c
  18 +++ b/drivers/net/wireless/rt2x00/rt2800pci.c
  19 @@ -593,6 +593,10 @@ static void rt2800pci_kill_tx_queue(stru
  20                 return;
  21         }
  22
  23 +       rt2800_register_read(rt2x00dev, WPDMA_GLO_CFG, &reg);
  24 +       rt2x00_set_field32(&reg, WPDMA_GLO_CFG_ENABLE_TX_DMA, 0);
  25 +       rt2800_register_write(rt2x00dev, WPDMA_GLO_CFG, reg);
  26 +
  27         rt2800_register_read(rt2x00dev, WPDMA_RST_IDX, &reg);
  28         rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX0, (queue->qid == QID_AC_BE));
  29         rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX1, (queue->qid == QID_AC_BK));