b43: Add debugfs firmware debugging knob

This adds a firmware debugging knob to debugfs.
With this knob it's possible to enable advanced runtime firmware
checks.
For now it only implements one sanity check for the mac-suspend.
In future there'll probably be more.
If CONFIG_B43_DEBUG is disabled, these checks will collapse to nothing.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index c14d522d69e3..82cca19137f4 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -2487,6 +2487,19 @@ static void b43_gpio_cleanup(struct b43_wldev *dev)
 /* http://bcm-specs.sipsolutions.net/EnableMac */
 void b43_mac_enable(struct b43_wldev *dev)
 {
+        if (b43_debug(dev, B43_DBG_FIRMWARE)) {
+                u16 fwstate;
+
+                fwstate = b43_shm_read16(dev, B43_SHM_SHARED,
+                                         B43_SHM_SH_UCODESTAT);
+                if ((fwstate != B43_SHM_SH_UCODESTAT_SUSP) &&
+                    (fwstate != B43_SHM_SH_UCODESTAT_SLEEP)) {
+                        b43err(dev->wl, "b43_mac_enable(): The firmware "
+                               "should be suspended, but current state is %u\n",
+                               fwstate);
+                }
+        }
+
         dev->mac_suspended--;
         B43_WARN_ON(dev->mac_suspended < 0);
         if (dev->mac_suspended == 0) {