Acquire a reference to the carrier's kernel module in bus code, so
it can't be removed from the kernel while it still has a bus and thus
possibly devices attached to it.
Signed-off-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Reported-by: Andreas Werner <andreas.werner@xxxxxx>
Tested-by: Andreas Werner <andreas.werner@xxxxxx>
Fixes: '3764e82e5' drivers: Introduce MEN Chameleon Bus
Cc: stable@xxxxxxxxxxxxxxx # v3.15+
---
drivers/mcb/mcb-core.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/mcb/mcb-core.c b/drivers/mcb/mcb-core.c
index f5923c2..6f2c852 100644
--- a/drivers/mcb/mcb-core.c
+++ b/drivers/mcb/mcb-core.c
@@ -61,22 +61,36 @@ static int mcb_probe(struct device *dev)
struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
struct mcb_device *mdev = to_mcb_device(dev);
const struct mcb_device_id *found_id;
+ struct module *carrier_mod;
+ int ret;
found_id = mcb_match_id(mdrv->id_table, mdev);
if (!found_id)
return -ENODEV;
+ carrier_mod = mdev->dev.parent->driver->owner;
+ if (!try_module_get(carrier_mod))
+ return -EINVAL;
+
get_device(dev);
- return mdrv->probe(mdev, found_id);
+ ret = mdrv->probe(mdev, found_id);
+ if (ret)
+ module_put(carrier_mod);
+
+ return ret;
}
static int mcb_remove(struct device *dev)
{
struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
struct mcb_device *mdev = to_mcb_device(dev);
+ struct module *carrier_mod;
mdrv->remove(mdev);
+ carrier_mod = mdev->dev.parent->driver->owner;
+ module_put(carrier_mod);
+
put_device(&mdev->dev);
return 0;
--
1.8.5.6
--
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