net: ks8851: fix link error

stable inclusion
from stable-5.10.71
commit 1f2ca30fbde6387c2c68e7b8fc3bdda3158d2789
bugzilla: 182981 https://gitee.com/openeuler/kernel/issues/I4I3KD

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1f2ca30fbde6387c2c68e7b8fc3bdda3158d2789

--------------------------------

[ Upstream commit 51bb08dd ]

An object file cannot be built for both loadable module and built-in
use at the same time:

arm-linux-gnueabi-ld: drivers/net/ethernet/micrel/ks8851_common.o: in function `ks8851_probe_common':
ks8851_common.c:(.text+0xf80): undefined reference to `__this_module'

Change the ks8851_common code to be a standalone module instead,
and use Makefile logic to ensure this is built-in if at least one
of its two users is.

Fixes: 797047f8 ("net: ks8851: Implement Parallel bus operations")
Link: https://lore.kernel.org/netdev/20210125121937.3900988-1-arnd@kernel.org/Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Acked-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/net/ethernet/micrel/Makefile

@@ -4,8 +4,6 @@
 #
 
 obj-$(CONFIG_KS8842) += ks8842.o
-obj-$(CONFIG_KS8851) += ks8851.o
-ks8851-objs = ks8851_common.o ks8851_spi.o
-obj-$(CONFIG_KS8851_MLL) += ks8851_mll.o
-ks8851_mll-objs = ks8851_common.o ks8851_par.o
+obj-$(CONFIG_KS8851) += ks8851_common.o ks8851_spi.o
+obj-$(CONFIG_KS8851_MLL) += ks8851_common.o ks8851_par.o
 obj-$(CONFIG_KSZ884X_PCI) += ksz884x.o

drivers/net/ethernet/micrel/ks8851_common.c

@@ -1031,6 +1031,7 @@ int ks8851_suspend(struct device *dev)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ks8851_suspend);
 
 int ks8851_resume(struct device *dev)
 {
@@ -1044,6 +1045,7 @@ int ks8851_resume(struct device *dev)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ks8851_resume);
 #endif
 
 int ks8851_probe_common(struct net_device *netdev, struct device *dev,
@@ -1175,6 +1177,7 @@ int ks8851_probe_common(struct net_device *netdev, struct device *dev,
 err_reg_io:
 	return ret;
 }
+EXPORT_SYMBOL_GPL(ks8851_probe_common);
 
 int ks8851_remove_common(struct device *dev)
 {
@@ -1191,3 +1194,8 @@ int ks8851_remove_common(struct device *dev)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ks8851_remove_common);
+
+MODULE_DESCRIPTION("KS8851 Network driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");