[PATCH v1 3/5] drivers/char: make dbc_uart_dump() a bit more useful

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

Make it safe to call also if xhci console is not enabled. And make it
non-static, to require one less modification when actually using it.
When using it, one still needs to add its declaration in some header
(or just next to the call site).

Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
---
IIUC Misra would not be happy about a declaration of an usused function.
And I'd rather avoid extending DBC_DEBUG scope beyond that single file.
---
 xen/drivers/char/xhci-dbc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/char/xhci-dbc.c b/xen/drivers/char/xhci-dbc.c
index c4bb371ff78f..ced28cae0a29 100644
--- a/xen/drivers/char/xhci-dbc.c
+++ b/xen/drivers/char/xhci-dbc.c
@@ -1498,11 +1498,14 @@ static void dbc_dump(struct dbc *dbc)
               readq(&r->cp) == virt_to_maddr(dbc->dbc_ctx));
 }
 
-static void dbc_uart_dump(void)
+void dbc_uart_dump(void)
 {
     struct dbc_uart *uart = &dbc_uart;
     struct dbc *dbc = &uart->dbc;
 
+    if ( !dbc->enable )
+        return;
+
     dbc_dump(dbc);
 }
 #endif
-- 
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