b43: Dynamically control log verbosity

Dynamically control the log verbosity with a module parameter.
This enables us to dynamically enable debugging messages (or disable
info, warn, error messages) via module parameter or /sys/module/b43/parameters/verbose.

This increases the module size by about 3k. But in practice it reduces the
module size for the user, because some distributions ship the b43 module
with CONFIG_B43_DEBUG set, which increases the module by about 15k.

So with this patch applied, distributions should really _disable_ CONFIG_B43_DEBUG.
There is no reason to keep it in a production-release kernel.
So we have a net reduction in size by about 12k.

This patch also adds a printk of the wireless core revision, so people
don't have to enable SSB debugging to get the wireless core revision.

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

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/net/wireless/b43/Kconfig b/drivers/net/wireless/b43/Kconfig
index 1f81d36f87c..aab71a70ba7 100644
--- a/drivers/net/wireless/b43/Kconfig
+++ b/drivers/net/wireless/b43/Kconfig
@@ -110,10 +110,18 @@ config B43_DEBUG
 	bool "Broadcom 43xx debugging"
 	depends on B43
 	---help---
-	  Broadcom 43xx debugging messages.
+	  Broadcom 43xx debugging.
 
-	  Say Y, if you want to find out why the driver does not
-	  work for you.
+	  This adds additional runtime sanity checks and statistics to the driver.
+	  These checks and statistics might me expensive and hurt runtime performance
+	  of your system.
+	  This also adds the b43 debugfs interface.
+
+	  Do not enable this, unless you are debugging the driver.
+
+	  Say N, if you are a distributor or user building a release kernel
+	  for production use.
+	  Only say Y, if you are debugging a problem in the b43 driver sourcecode.
 
 config B43_FORCE_PIO
 	bool "Force usage of PIO instead of DMA"