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authorAlan Cox <alan@redhat.com>2008-09-22 15:58:14 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-09-22 08:42:50 -0700
commitcec5eb7be3a104fffd27ca967ee8e15a123050e2 (patch)
treebf5579c6e47a120d5ba59aa6f90bb29ad96817f5 /drivers/pcmcia
parentae9111912500db9fcc244ec16c3d7e471c551f52 (diff)
downloadlinux-cec5eb7be3a104fffd27ca967ee8e15a123050e2.tar.bz2
pcmcia: Fix broken abuse of dev->driver_data
PCMCIA abuses dev->private_data in the probe methods. Unfortunately it continues to abuse it after calling drv->probe() which leads to crashes and other nasties (such as bogus probes of multifunction devices) giving errors like pcmcia: registering new device pcmcia0.1 kernel: 0.1: GetNextTuple: No more items Extract the passed data before calling the driver probe function that way we don't blow up when the driver reuses dev->private_data as its right. As its close to the final release just move the hack so it works out, hopefully someone will be sufficiently embarrassed to produce a nice rework for 2.6.28. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/pcmcia')
-rw-r--r--drivers/pcmcia/ds.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 4174d9656e35..34c83d3ca0fa 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -427,6 +427,18 @@ static int pcmcia_device_probe(struct device * dev)
p_drv = to_pcmcia_drv(dev->driver);
s = p_dev->socket;
+ /* The PCMCIA code passes the match data in via dev->driver_data
+ * which is an ugly hack. Once the driver probe is called it may
+ * and often will overwrite the match data so we must save it first
+ *
+ * handle pseudo multifunction devices:
+ * there are at most two pseudo multifunction devices.
+ * if we're matching against the first, schedule a
+ * call which will then check whether there are two
+ * pseudo devices, and if not, add the second one.
+ */
+ did = p_dev->dev.driver_data;
+
ds_dbg(1, "trying to bind %s to %s\n", p_dev->dev.bus_id,
p_drv->drv.name);
@@ -455,21 +467,14 @@ static int pcmcia_device_probe(struct device * dev)
goto put_module;
}
- /* handle pseudo multifunction devices:
- * there are at most two pseudo multifunction devices.
- * if we're matching against the first, schedule a
- * call which will then check whether there are two
- * pseudo devices, and if not, add the second one.
- */
- did = p_dev->dev.driver_data;
if (did && (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) &&
(p_dev->socket->device_count == 1) && (p_dev->device_no == 0))
pcmcia_add_device_later(p_dev->socket, 0);
- put_module:
+put_module:
if (ret)
module_put(p_drv->owner);
- put_dev:
+put_dev:
if (ret)
put_device(dev);
return (ret);