smsc-ircc2: skip preconfiguration for PNP devices
Bjorn Helgaas [Wed, 27 Jun 2007 21:09:50 +0000 (14:09 -0700)]
If we rely on the device resources from PNPBIOS, we also have to rely on
the BIOS to configure any bridges on the way to the device.

Using the PNPBIOS resources but changing the configuration of a bridge
behind the back of the firmware is likely to make things inconsistent.

This patch addresses part of the 2.6.22 regression:
    "no irda0 interface (2.6.21 was OK), smsc does not find chip"
It fixes smsc-ircc2 PNP device detection on HP nx5000 laptops.
Other laptops, including HP nc6000, HP nc8000, HP nw8000, and Toshiba
Portege 4000, still need PNP quirks to make this work.

With "smsc-ircc2.nopnp", we do the legacy device probe, including manual
bridge preconfiguration, as before.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Samuel Ortiz <samuel@sortiz.org>
Acked-by: "Linus Walleij (LD/EAB)" <linus.walleij@ericsson.com>
Cc: Andrey Borzenkov <arvidjaar@mail.ru>
Cc: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Adam Belay <ambx1@neo.rr.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/net/irda/smsc-ircc2.c

index 9043bf4..2803b37 100644 (file)
@@ -416,6 +416,13 @@ static int __init smsc_ircc_legacy_probe(void)
 {
        int ret = 0;
 
+#ifdef CONFIG_PCI
+       if (smsc_ircc_preconfigure_subsystems(ircc_cfg, ircc_fir, ircc_sir, ircc_dma, ircc_irq) < 0) {
+               /* Ignore errors from preconfiguration */
+               IRDA_ERROR("%s, Preconfiguration failed !\n", driver_name);
+       }
+#endif
+
        if (ircc_fir > 0 && ircc_sir > 0) {
                IRDA_MESSAGE(" Overriding FIR address 0x%04x\n", ircc_fir);
                IRDA_MESSAGE(" Overriding SIR address 0x%04x\n", ircc_sir);
@@ -459,13 +466,6 @@ static int __init smsc_ircc_init(void)
                return ret;
        }
 
-#ifdef CONFIG_PCI
-       if (smsc_ircc_preconfigure_subsystems(ircc_cfg, ircc_fir, ircc_sir, ircc_dma, ircc_irq) < 0) {
-               /* Ignore errors from preconfiguration */
-               IRDA_ERROR("%s, Preconfiguration failed !\n", driver_name);
-       }
-#endif
-
        dev_count = 0;
 
        if (smsc_nopnp || !pnp_platform_devices ||