[PATCH -next] usb: cdc-wdm: fix build error when CONFIG_WWAN_CORE is not set

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Fix build error when CONFIG_WWAN_CORE is not set:

x86_64-linux-gnu-ld: drivers/usb/class/cdc-wdm.o: in function `wdm_disconnect':
cdc-wdm.c:(.text+0xb2a): undefined reference to `wwan_remove_port'
x86_64-linux-gnu-ld: drivers/usb/class/cdc-wdm.o: in function `wdm_in_callback':
cdc-wdm.c:(.text+0xf23): undefined reference to `wwan_port_rx'
x86_64-linux-gnu-ld: drivers/usb/class/cdc-wdm.o: in function `wdm_wwan_port_stop':
cdc-wdm.c:(.text+0x127d): undefined reference to `wwan_port_get_drvdata'
x86_64-linux-gnu-ld: drivers/usb/class/cdc-wdm.o: in function `wdm_wwan_port_tx':
cdc-wdm.c:(.text+0x12d9): undefined reference to `wwan_port_get_drvdata'
x86_64-linux-gnu-ld: cdc-wdm.c:(.text+0x13c1): undefined reference to `wwan_port_txoff'
x86_64-linux-gnu-ld: drivers/usb/class/cdc-wdm.o: in function `wdm_wwan_port_start':
cdc-wdm.c:(.text+0x13e0): undefined reference to `wwan_port_get_drvdata'
x86_64-linux-gnu-ld: cdc-wdm.c:(.text+0x1431): undefined reference to `wwan_port_txon'
x86_64-linux-gnu-ld: drivers/usb/class/cdc-wdm.o: in function `wdm_wwan_port_tx_complete':
cdc-wdm.c:(.text+0x14a4): undefined reference to `wwan_port_txon'
x86_64-linux-gnu-ld: drivers/usb/class/cdc-wdm.o: in function `wdm_create.cold':
cdc-wdm.c:(.text.unlikely+0x209): undefined reference to `wwan_create_port'

Fixes: cac6fb015f71 ("usb: class: cdc-wdm: WWAN framework integration")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
---
 drivers/usb/class/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/class/Kconfig b/drivers/usb/class/Kconfig
index d3f5162bd67e..7e502c046031 100644
--- a/drivers/usb/class/Kconfig
+++ b/drivers/usb/class/Kconfig
@@ -30,6 +30,7 @@ config USB_PRINTER
 
 config USB_WDM
 	tristate "USB Wireless Device Management support"
+	depends on WWAN_CORE
 	help
 	  This driver supports the WMC Device Management functionality
 	  of cell phones compliant to the CDC WMC specification. You can use




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