package/kernel/mac80211/patches/903-wlcore-block-read-writes-to-FW-during-ELP.patch

   1 When the chip is in ELP mode read/write to FW is invalid and may cause
   2 the lower layers to get stuck. The reads/writes concerning ELP wakeup
   3 are the exception here and are checked for. In addition to blocking the
   4 IO, produce a warning.
   5
   6 Signed-off-by: Barak Bercovitz <barak@wizery.com>
   7 Signed-off-by: Eliad Peller <eliad@wizery.com>
   8
   9 ---
  10 drivers/net/wireless/ti/wlcore/io.h | 8 ++++++--
  11  1 file changed, 6 insertions(+), 2 deletions(-)
  12
  13 --- a/drivers/net/wireless/ti/wlcore/io.h
  14 +++ b/drivers/net/wireless/ti/wlcore/io.h
  15 @@ -60,7 +60,9 @@ static inline int __must_check wlcore_ra
  16  {
  17         int ret;
  18
  19 -       if (test_bit(WL1271_FLAG_IO_FAILED, &wl->flags))
  20 +       if (test_bit(WL1271_FLAG_IO_FAILED, &wl->flags) ||
  21 +           WARN_ON((test_bit(WL1271_FLAG_IN_ELP, &wl->flags) &&
  22 +                    addr != HW_ACCESS_ELP_CTRL_REG)))
  23                 return -EIO;
  24
  25         ret = wl->if_ops->write(wl->dev, addr, buf, len, fixed);
  26 @@ -76,7 +78,9 @@ static inline int __must_check wlcore_ra
  27  {
  28         int ret;
  29
  30 -       if (test_bit(WL1271_FLAG_IO_FAILED, &wl->flags))
  31 +       if (test_bit(WL1271_FLAG_IO_FAILED, &wl->flags) ||
  32 +           WARN_ON((test_bit(WL1271_FLAG_IN_ELP, &wl->flags) &&
  33 +                    addr != HW_ACCESS_ELP_CTRL_REG)))
  34                 return -EIO;
  35
  36         ret = wl->if_ops->read(wl->dev, addr, buf, len, fixed);