wimax: allow WIMAX_RF_QUERY calls when state is still uninitialized

Until now, calls to wimax_rfkill() will be blocked until the device is
at least past the WIMAX_ST_UNINITIALIZED state, return -ENOMEDIUM when
the device is in the WIMAX_ST_DOWN state.

In parallel, wimax-tools would issue a wimax_rfkill(WIMAX_RF_QUERY)
call right after opening a handle with wimaxll_open() as means to
verify if the interface is really a WiMAX interface [newer kernel
version will have a call specifically for this].

The combination of these two facts is that in some cases, before the
driver has finalized initializing its device's firmware, a
wimaxll_open() call would fail, when it should not.

Thus, change the wimax_rfkill() code to allow queries when the device
is in WIMAX_ST_UNINITIALIZED state.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/net/wimax/op-rfkill.c b/net/wimax/op-rfkill.c
index 40e1210cdbd8..94d339c345d2 100644
--- a/net/wimax/op-rfkill.c
+++ b/net/wimax/op-rfkill.c
@@ -305,8 +305,15 @@ int wimax_rfkill(struct wimax_dev *wimax_dev, enum wimax_rf_state state)
         d_fnstart(3, dev, "(wimax_dev %p state %u)\n", wimax_dev, state);
         mutex_lock(&wimax_dev->mutex);
         result = wimax_dev_is_ready(wimax_dev);
-        if (result < 0)
+        if (result < 0) {
+                /* While initializing, < 1.4.3 wimax-tools versions use
+                 * this call to check if the device is a valid WiMAX
+                 * device; so we allow it to proceed always,
+                 * considering the radios are all off. */
+                if (result == -ENOMEDIUM && state == WIMAX_RF_QUERY)
+                        result = WIMAX_RF_OFF << 1 | WIMAX_RF_OFF;
                 goto error_not_ready;
+        }
         switch (state) {
         case WIMAX_RF_ON:
         case WIMAX_RF_OFF: