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

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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>
This commit is contained in:
Alan Stern 2008-10-02 11:48:13 -04:00 committed by Greg Kroah-Hartman
parent 2b70f07343
commit 9beeee6584
5 changed files with 29 additions and 2 deletions
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4
drivers/usb/core/hcd.c
View File

@ -81,6 +81,10 @@
/*-------------------------------------------------------------------------*/
/* Keep track of which host controller drivers are loaded */
unsigned long usb_hcds_loaded;
EXPORT_SYMBOL_GPL(usb_hcds_loaded);
/* host controllers we manage */
LIST_HEAD (usb_bus_list);
EXPORT_SYMBOL_GPL (usb_bus_list);

6
drivers/usb/core/hcd.h
View File

@ -482,4 +482,10 @@ static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
*/
extern struct rw_semaphore ehci_cf_port_reset_rwsem;
/* Keep track of which host controller drivers are loaded */
#define USB_UHCI_LOADED 0
#define USB_OHCI_LOADED 1
#define USB_EHCI_LOADED 2
extern unsigned long usb_hcds_loaded;
#endif /* __KERNEL__ */

15
drivers/usb/host/ehci-hcd.c
View File

@ -1046,6 +1046,12 @@ static int __init ehci_hcd_init(void)
return -ENODEV;
printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
" before uhci_hcd and ohci_hcd, not after\n");
pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
hcd_name,
sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
@ -1053,8 +1059,10 @@ static int __init ehci_hcd_init(void)
#ifdef DEBUG
ehci_debug_root = debugfs_create_dir("ehci", NULL);
if (!ehci_debug_root)
return -ENOENT;
if (!ehci_debug_root) {
retval = -ENOENT;
goto err_debug;
}
#endif
#ifdef PLATFORM_DRIVER
@ -1102,6 +1110,8 @@ clean0:
debugfs_remove(ehci_debug_root);
ehci_debug_root = NULL;
#endif
err_debug:
clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
return retval;
}
module_init(ehci_hcd_init);
@ -1123,6 +1133,7 @@ static void __exit ehci_hcd_cleanup(void)
#ifdef DEBUG
debugfs_remove(ehci_debug_root);
#endif
clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
}
module_exit(ehci_hcd_cleanup);

3
drivers/usb/host/ohci-hcd.c
View File

@ -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);

3
drivers/usb/host/uhci-hcd.c
View File

@ -955,6 +955,7 @@ static int __init uhci_hcd_init(void)
printk(KERN_INFO "uhci_hcd: " DRIVER_DESC "%s\n",
ignore_oc ? ", overcurrent ignored" : "");
set_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
if (DEBUG_CONFIGURED) {
errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
@ -987,6 +988,7 @@ debug_failed:
errbuf_failed:
clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
return retval;
}
@ -996,6 +998,7 @@ static void __exit uhci_hcd_cleanup(void)
kmem_cache_destroy(uhci_up_cachep);
debugfs_remove(uhci_debugfs_root);
kfree(errbuf);
clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
}
module_init(uhci_hcd_init);