From 9beeee6584b9aa4f9192055512411484a2a624df Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Thu, 2 Oct 2008 11:48:13 -0400 Subject: 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 Cc: stable [2.6.27] Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-hcd.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) (limited to 'drivers/usb/host/ehci-hcd.c') diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index fcbc1f2b237..358df2a6c39 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -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); -- cgit v1.2.3