[PATCH] ppc64: add MODALIAS= for vio bus

A non-broken udev would autoload also the drivers for devices on the
pseries vio bus, like ibmveth, ibmvscsic and hvsc.  This is similar to pci,
usb and ieee1394:

 /lib/modules/`uname -r`/modules.alias
alias vio:TvscsiSIBM,v-scsi* ibmvscsic
alias vio:TnetworkSIBM,l-lan* ibmveth
alias vio:Tserial-serverShvterm2* hvcs

/events/debug.00004.pci.add.1394:MODALIAS='pci:v00001014d00000188sv00000000sd00000000bc06sc04i0f'
/events/debug.00005.pci.add.1509:MODALIAS='pci:v00008086d00001229sv00001014sd000001FFbc02sc00i00'
/events/debug.00026.vio.add.1519:MODALIAS='vio:TserialShvterm1'
/events/debug.00027.vio.add.1446:MODALIAS='vio:TvscsiSIBM,v-scsi'
/events/debug.00028.vio.add.1451:MODALIAS='vio:TnetworkSIBM,l-lan'

 modprobe -v vio:TnetworkSIBM,l-lan
insmod /lib/modules/2.6.14-20051030_vio-ppc64/kernel/drivers/net/ibmveth.ko

Signed-off-by: Olaf Hering <olh@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index 97082a4203ad..71a6addf9f7f 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -21,6 +21,7 @@
 #include <asm/iommu.h>
 #include <asm/dma.h>
 #include <asm/vio.h>
+#include <asm/prom.h>
 
 static const struct vio_device_id *vio_match_device(
                 const struct vio_device_id *, const struct vio_dev *);
@@ -265,7 +266,33 @@ static int vio_bus_match(struct device *dev, struct device_driver *drv)
         return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
 }
 
+static int vio_hotplug(struct device *dev, char **envp, int num_envp,
+                        char *buffer, int buffer_size)
+{
+        const struct vio_dev *vio_dev = to_vio_dev(dev);
+        char *cp;
+        int length;
+
+        if (!num_envp)
+                return -ENOMEM;
+
+        if (!vio_dev->dev.platform_data)
+                return -ENODEV;
+        cp = (char *)get_property(vio_dev->dev.platform_data, "compatible", &length);
+        if (!cp)
+                return -ENODEV;
+
+        envp[0] = buffer;
+        length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s",
+                                vio_dev->type, cp);
+        if (buffer_size - length <= 0)
+                return -ENOMEM;
+        envp[1] = NULL;
+        return 0;
+}
+
 struct bus_type vio_bus_type = {
         .name = "vio",
+        .hotplug = vio_hotplug,
         .match = vio_bus_match,
 };