USB: EHCI: log a warning if ehci-hcd is not loaded first

This patch (as1139) adds a warning to the system log whenever ehci-hcd
is loaded after ohci-hcd or uhci-hcd.  Nowadays most distributions are
pretty good about not doing this; maybe the warning will help convince
anyone still doing it wrong.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>  [2.6.27]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 0afeda836df3..8647dab0d7f9 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1095,6 +1095,7 @@ static int __init ohci_hcd_mod_init(void)
         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
         pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
                 sizeof (struct ed), sizeof (struct td));
+        set_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
 
 #ifdef DEBUG
         ohci_debug_root = debugfs_create_dir("ohci", NULL);
@@ -1181,6 +1182,7 @@ static int __init ohci_hcd_mod_init(void)
  error_debug:
 #endif
 
+        clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
         return retval;
 }
 module_init(ohci_hcd_mod_init);
@@ -1211,6 +1213,7 @@ static void __exit ohci_hcd_mod_exit(void)
 #ifdef DEBUG
         debugfs_remove(ohci_debug_root);
 #endif
+        clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
 }
 module_exit(ohci_hcd_mod_exit);