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USB: remove use of the bus rwsem, as it doesn't really protect anything.

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The driver core stopped using the rwsem a long time ago, yet the USB
core still grabbed the lock, thinking it protected something.  This
patch removes that useless use.

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Oliver Neukum <oneukum@suse.de>
Cc: David Brownell <david-b@pacbell.net>
Cc: linux-usb-devel <linux-usb-devel@lists.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman
2007-04-09 11:52:31 -04:00
parent b7bb125dc3
commit 341487a837
4 changed files with 7 additions and 22 deletions
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2
drivers/usb/core/devices.c
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@ -246,7 +246,6 @@ static char *usb_dump_interface_descriptor(char *start, char *end,
if (start > end)
return start;
down_read(&usb_bus_type.subsys.rwsem);
if (iface) {
driver_name = (iface->dev.driver
? iface->dev.driver->name
@ -263,7 +262,6 @@ static char *usb_dump_interface_descriptor(char *start, char *end,
desc->bInterfaceSubClass,
desc->bInterfaceProtocol,
driver_name);
up_read(&usb_bus_type.subsys.rwsem);
return start;
}