[PATCH V2] b43: warn when forcing PIO mode

[Rafał Miłecki]

We have resolved all the known issues with DMA mode, however some users
(or distros) are still forcing PIO mode by config files. Without
debugging enabled it's not noticable at all. Add the warning for them.

Cc: Gregory Bellier <gregory.bellier at gmail.com>
Signed-off-by: Rafał Miłecki <zajec5 at gmail.com>
---
V2: typo in "parameter". I have to install spell checker for vim ;)
Thx Gregory.
---
 drivers/net/wireless/b43/main.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 1adadc8..e0b1156 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -4636,8 +4636,13 @@ static int b43_wireless_core_init(struct b43_wldev *dev)
 	b43_shm_write16(dev, B43_SHM_SCRATCH, B43_SHM_SC_MAXCONT, 0x3FF);
 
 	if (b43_bus_host_is_pcmcia(dev->dev) ||
-	    b43_bus_host_is_sdio(dev->dev) ||
-	    dev->use_pio) {
+	    b43_bus_host_is_sdio(dev->dev)) {
+		dev->__using_pio_transfers = 1;
+		err = b43_pio_init(dev);
+	} else if (dev->use_pio) {
+		b43warn(dev->wl, "Forced PIO by use_pio module parameter. "
+			"This should not be needed and will result in lower "
+			"performance.\n");
 		dev->__using_pio_transfers = 1;
 		err = b43_pio_init(dev);
 	} else {
-- 
1.7.3.4