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| author | Chris Rorvick <chris@rorvick.com> | 2014-11-04 19:18:46 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-07 09:02:37 -0800 |
| commit | 895baf2404ebc2f875fad39d2d81f98a38a8f9cc (patch) | |
| tree | 200509a35abdbe5da9a9e5c217e99b27135bfc7e /drivers/usb/host | |
| parent | b9ec1c9da64f0c1d130beb125a916d0725363ec9 (diff) | |
| download | linux-895baf2404ebc2f875fad39d2d81f98a38a8f9cc.tar.gz linux-895baf2404ebc2f875fad39d2d81f98a38a8f9cc.tar.bz2 linux-895baf2404ebc2f875fad39d2d81f98a38a8f9cc.zip | |
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
<linux/usb/ehci_def.h> 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 <chris@rorvick.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/fusbh200.h | 5 |
1 files changed, 5 insertions, 0 deletions
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 */ |