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| author |   Chris Rorvick <chris@rorvick.com> | 2014-11-04 19:18:50 -0600 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-07 09:02:38 -0800 |
| commit | a648c147011d97e0d410f251c27175231975584d (patch) | |
| tree | 2238f06dee3f6bbf334c660cd9d390b6d81058da /drivers/usb/host | |
| parent | fusbh200: Use ehci_dbg_port struct (diff) | |
| download | linux-dev-a648c147011d97e0d410f251c27175231975584d.tar.xz linux-dev-a648c147011d97e0d410f251c27175231975584d.zip | |
fotg210: Make Xen notification 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 fotg210 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
fotg210 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 fotg210 drivers
under the relevant configurations:
EARLY_PRINTK_DBGP? XEN_DOM0? ehci-dbgp fotg210
------------------ --------- ------------- -------------
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 fotg210 is, at best, indifferent to whether Xen is
notified of these events. Make fotg210 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/fotg210.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/host/fotg210.h b/drivers/usb/host/fotg210.h index ac6cd1bfd208..98c9670bcf82 100644 --- a/drivers/usb/host/fotg210.h +++ b/drivers/usb/host/fotg210.h @@ -326,6 +326,10 @@ 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? */ @@ -335,6 +339,7 @@ static inline int xen_dbgp_external_startup(struct usb_hcd *hcd) { return -1; } +#endif #ifdef CONFIG_EARLY_PRINTK_DBGP /* Call backs from fotg210 host driver to fotg210 debug driver */ |