[xen staging] ns16550: properly gate Exar PCIe UART cards support

[patchbot@xxxxxxx]

commit 93713f444b3f29d6848527506db69cf78976b32d
Author:     Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
AuthorDate: Fri Aug 20 16:18:12 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Aug 20 16:18:12 2021 +0200

    ns16550: properly gate Exar PCIe UART cards support
    
    Arm is about to get PCI passthrough support which means CONFIG_HAS_PCI
    will be enabled, so this code will fail as Arm doesn't have ns16550
    PCI support:
    
    ns16550.c:313:5: error: implicit declaration of function 
'enable_exar_enhanced_bits' [-Werror=implicit-function-declaration]
      313 |     enable_exar_enhanced_bits(uart);
          |     ^~~~~~~~~~~~~~~~~~~~~~~~~
    
    Fix this by gating Exar PCIe UART cards support with the above in mind.
    
    Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/drivers/char/ns16550.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c
index b777c8711e..e2c24082c3 100644
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -308,7 +308,7 @@ static void ns16550_setup_preirq(struct ns16550 *uart)
     /* Handle the DesignWare 8250 'busy-detect' quirk. */
     handle_dw_usr_busy_quirk(uart);
 
-#ifdef CONFIG_HAS_PCI
+#ifdef NS16550_PCI
     /* Enable Exar "Enhanced function bits" */
     enable_exar_enhanced_bits(uart);
 #endif
--
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