If the parport bus is not yet registered and any device using parallel
port tries to register with the bus we get a stackdump with a message
of Kernel bug.
Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 4.2+
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@xxxxxxxxxxxxxxx>
---
Hi Ross,
Can you please test this patch in your setup. This is a respin of the
previous patch in another way.
drivers/parport/share.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/parport/share.c b/drivers/parport/share.c
index 3308427..c1eba80 100644
--- a/drivers/parport/share.c
+++ b/drivers/parport/share.c
@@ -135,9 +135,18 @@ static struct bus_type parport_bus_type = {
.probe = parport_probe,
};
+static bool is_registered;
+
int parport_bus_init(void)
{
- return bus_register(&parport_bus_type);
+ int ret;
+
+ ret = bus_register(&parport_bus_type);
+ if (ret)
+ return ret;
+
+ is_registered = true;
+ return 0;
}
void parport_bus_exit(void)
@@ -273,6 +282,9 @@ int __parport_register_driver(struct parport_driver *drv, struct module *owner,
/* using device model */
int ret;
+ if (!is_registered)
+ return -EAGAIN;
+
/* initialize common driver fields */
drv->driver.name = drv->name;
drv->driver.bus = &parport_bus_type;
--
1.9.1
--
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