[PATCH -next] PCI: endpoint: Fix Kconfig dependency

[Ren Zhijie]

If CONFIG_NTB is not set and CONFIG_PCI_EPF_VNTB is y.

make ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu-, will be failed, like this:

drivers/pci/endpoint/functions/pci-epf-vntb.o: In function `epf_ntb_cmd_handler':
pci-epf-vntb.c:(.text+0x95e): undefined reference to `ntb_db_event'
pci-epf-vntb.c:(.text+0xa1f): undefined reference to `ntb_link_event'
pci-epf-vntb.c:(.text+0xa42): undefined reference to `ntb_link_event'
drivers/pci/endpoint/functions/pci-epf-vntb.o: In function `pci_vntb_probe':
pci-epf-vntb.c:(.text+0x1250): undefined reference to `ntb_register_device'

The functions ntb_*() are defined in drivers/ntb/core.c, which need CONFIG_NTB setting y to be build-in.
To fix this build error, add depends on NTB.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: ff32fac00d97("NTB: EPF: support NTB transfer between PCI RC and EP connection")
Signed-off-by: Ren Zhijie <renzhijie2@xxxxxxxxxx>
Acked-by: Frank Li <frank.li@xxxxxxx>

---
v2: Fix some commit message errors
---
 drivers/pci/endpoint/functions/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/endpoint/functions/Kconfig b/drivers/pci/endpoint/functions/Kconfig
index 362555b024e8..9beee4f0f4ee 100644
--- a/drivers/pci/endpoint/functions/Kconfig
+++ b/drivers/pci/endpoint/functions/Kconfig
@@ -29,6 +29,7 @@ config PCI_EPF_NTB
 config PCI_EPF_VNTB
         tristate "PCI Endpoint NTB driver"
         depends on PCI_ENDPOINT
+        depends on NTB
         select CONFIGFS_FS
         help
           Select this configuration option to enable the Non-Transparent
-- 
2.17.1