From 895baf2404ebc2f875fad39d2d81f98a38a8f9cc Mon Sep 17 00:00:00 2001 From: Chris Rorvick Date: Tue, 4 Nov 2014 19:18:46 -0600 Subject: [PATCH] fusbh200: Make Xen notificaiton consistent with EHCI If CONFIG_XEN_DOM0 is enabled, the ehci-dbgp driver notifies Xen of controller reset events via xen_dbgp_reset_prep() and xen_dbgp_external_startup() (via calls to xen_dbgp_op().) Otherwise defines them as no-ops to disable this logic. The fusbh200 driver copies much of the dbgp code from ehci_def.h, but it unconditionally defines the Xen hooks as no-ops, effectively disabling these notifications when CONFIG_EARLY_PRINTK_DBGP is disabled. When enabled, though, notifying Xen is dependent on CONFIG_XEN_DOM0 due to fusbh200 leveraging the ehci-dbgp driver. The following table compares the implementations of xen_dbgp_reset_prep() and xen_dbgp_external_startup() in the ehci-dbgp and fusbh200 drivers under the relevant configurations: EARLY_PRINTK_DBGP? XEN_DOM0? ehci-dbgp fusbh200 ------------------ --------- ------------- ------------- n n no-op no-op n y xen_dbgp_op() no-op y n no-op no-op y y xen_dbgp_op() xen_dbgp_op() This suggests that fusbh200 is, at best, indifferent to whether Xen is notified of these events. Make fusbh200 consistent with ehci-dbgp as a step towards consolidating this code duplication. Signed-off-by: Chris Rorvick Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/fusbh200.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/host/fusbh200.h b/drivers/usb/host/fusbh200.h index 6b719e066c3f..6e7b8c1cb877 100644 --- a/drivers/usb/host/fusbh200.h +++ b/drivers/usb/host/fusbh200.h @@ -318,6 +318,10 @@ extern struct console early_dbgp_console; struct usb_hcd; +#ifdef CONFIG_XEN_DOM0 +extern int xen_dbgp_reset_prep(struct usb_hcd *); +extern int xen_dbgp_external_startup(struct usb_hcd *); +#else static inline int xen_dbgp_reset_prep(struct usb_hcd *hcd) { return 1; /* Shouldn't this be 0? */ @@ -327,6 +331,7 @@ static inline int xen_dbgp_external_startup(struct usb_hcd *hcd) { return -1; } +#endif #ifdef CONFIG_EARLY_PRINTK_DBGP /* Call backs from fusbh200 host driver to fusbh200 debug driver */ -- 2.20.1