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Date:   Sun,  3 Jan 2021 22:42:17 +0100
From:   Arnd Bergmann <>
To:     Felipe Balbi <>,
        Greg Kroah-Hartman <>,
        Jim Baxter <>
Cc:     Arnd Bergmann <>,,
Subject: [PATCH] usb: gadget: select CONFIG_CRC32

From: Arnd Bergmann <>

Without crc32 support, this driver fails to link:

arm-linux-gnueabi-ld: drivers/usb/gadget/function/f_eem.o: in function `eem_unwrap':
f_eem.c:(.text+0x11cc): undefined reference to `crc32_le'
arm-linux-gnueabi-ld: drivers/usb/gadget/function/f_ncm.o:f_ncm.c:(.text+0x1e40):
more undefined references to `crc32_le' follow

Fixes: 6d3865f9d41f ("usb: gadget: NCM: Add transmit multi-frame.")
Signed-off-by: Arnd Bergmann <>
 drivers/usb/gadget/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 7e47e6223089..2d152571a7de 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -265,6 +265,7 @@ config USB_CONFIGFS_NCM
 	depends on NET
 	select USB_U_ETHER
 	select USB_F_NCM
+	select CRC32
 	  NCM is an advanced protocol for Ethernet encapsulation, allows
 	  grouping of several ethernet frames into one USB transfer and
@@ -314,6 +315,7 @@ config USB_CONFIGFS_EEM
 	depends on NET
 	select USB_U_ETHER
 	select USB_F_EEM
+	select CRC32
 	  CDC EEM is a newer USB standard that is somewhat simpler than CDC ECM
 	  and therefore can be supported by more hardware.  Technically ECM and

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