m68k: macmace fixes

Fix a race condition in the transmit code, where the dma interrupt could update
the free tx buffer count concurrently and wedge the tx queue.

Fix the misuse of the rx frame status and rx frame length registers: no more
"fifo overrun" errors caused by the OFLOW bit being tested in the frame length
register (instead of the status register), and no more missed packets due to
incorrect length taken from status register (instead of the frame length
register).

Fix a panic (skb_over_panic BUG) caused by allocating and then copying an
incoming packet while the packet length register was changing.

Cut-and-paste the reset code from the powermac mace driver (mace.c), so the NIC
functions when MacOS does not initialise it (important for anyone wanting to
use the Emile boot loader).

Cut-and-paste the error counting and timeout recovery code from mace.c.

Fix over allocation of rx buffer memory (it's page order, not page count).

Converted to driver model.

Converted to DMA API.

Since I've run out of ways to make it fail, and since it performs well now,
promote the driver from EXPERIMENTAL status. Tested on both quadra 840av and
660av.
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/net/Kconfig

@@ -337,8 +337,8 @@ config MACSONIC
 	  be called macsonic.
 
 config MACMACE
-	bool "Macintosh (AV) onboard MACE ethernet (EXPERIMENTAL)"
-	depends on NET_ETHERNET && MAC && EXPERIMENTAL
+	bool "Macintosh (AV) onboard MACE ethernet"
+	depends on NET_ETHERNET && MAC
 	select CRC32
 	help
 	  Support for the onboard AMD 79C940 MACE Ethernet controller used in

drivers/net/Space.c

@@ -83,7 +83,6 @@ extern struct net_device *bagetlance_probe(int unit);
 extern struct net_device *mvme147lance_probe(int unit);
 extern struct net_device *tc515_probe(int unit);
 extern struct net_device *lance_probe(int unit);
-extern struct net_device *mace_probe(int unit);
 extern struct net_device *mac8390_probe(int unit);
 extern struct net_device *mac89x0_probe(int unit);
 extern struct net_device *mc32_probe(int unit);
@@ -274,9 +273,6 @@ static struct devprobe2 m68k_probes[] __initdata = {
 #ifdef CONFIG_MVME147_NET	/* MVME147 internal Ethernet */
 	{mvme147lance_probe, 0},
 #endif
-#ifdef CONFIG_MACMACE		/* Mac 68k Quadra AV builtin Ethernet */
-	{mace_probe, 0},
-#endif
 #ifdef CONFIG_MAC8390           /* NuBus NS8390-based cards */
 	{mac8390_probe, 0},
 #endif