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USB: Core: fix race in device_create

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There is a race from when a device is created with device_create() and
then the drvdata is set with a call to dev_set_drvdata() in which a
sysfs file could be open, yet the drvdata will be NULL, causing all
sorts of bad things to happen.

This patch fixes the problem by using the new function,
device_create_drvdata().

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2008-05-16 17:55:12 -07:00
parent bfd3a5a96c
commit c013d040b7
1 changed files with 3 additions and 3 deletions
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6
drivers/usb/core/hcd.c
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@ -818,12 +818,12 @@ static int usb_register_bus(struct usb_bus *bus)
set_bit (busnum, busmap.busmap);
bus->busnum = busnum;
bus->dev = device_create(usb_host_class, bus->controller, MKDEV(0, 0),
"usb_host%d", busnum);
bus->dev = device_create_drvdata(usb_host_class, bus->controller,
MKDEV(0, 0), bus,
"usb_host%d", busnum);
result = PTR_ERR(bus->dev);
if (IS_ERR(bus->dev))
goto error_create_class_dev;
dev_set_drvdata(bus->dev, bus);
/* Add it to the local list of buses */
list_add (&bus->bus_list, &usb_bus_list);