ARM: orion: fix orion_ge00_switch_board_info initialization

commit 8337d083507b9827dfb36d545538b7789df834fd upstream.

A section type mismatch warning shows up when building with LTO,
since orion_ge00_mvmdio_bus_name was put in __initconst but not marked
const itself:

include/linux/of.h: In function 'spear_setup_of_timer':
arch/arm/mach-spear/time.c:207:34: error: 'timer_of_match' causes a section type conflict with 'orion_ge00_mvmdio_bus_name'
 static const struct of_device_id timer_of_match[] __initconst = {
                                  ^
arch/arm/plat-orion/common.c:475:32: note: 'orion_ge00_mvmdio_bus_name' was declared here
 static __initconst const char *orion_ge00_mvmdio_bus_name = "orion-mii";
                                ^

As pointed out by Andrew Lunn, it should in fact be 'const' but not
'__initconst' because the string is never copied but may be accessed
after the init sections are freed. To fix that, I get rid of the
extra symbol and rewrite the initialization in a simpler way that
assigns both the bus_id and modalias statically.

I spotted another theoretical bug in the same place, where d->netdev[i]
may be an out of bounds access, this can be fixed by moving the device
assignment into the loop.

Cc: stable@vger.kernel.org
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm/plat-orion/common.c b/arch/arm/plat-orion/common.c
index aff6994950ba6db7eb6579a90cc94e5b2bfc7329..a2399fd66e97cef3db011508dc73c718c9456bc9 100644 (file)
--- a/arch/arm/plat-orion/common.c
+++ b/arch/arm/plat-orion/common.c
@@ -472,28 +472,27 @@ void __init orion_ge11_init(struct mv643xx_eth_platform_data *eth_data,
 /*****************************************************************************
  * Ethernet switch
  ****************************************************************************/
-static __initconst const char *orion_ge00_mvmdio_bus_name = "orion-mii";
-static __initdata struct mdio_board_info
-                 orion_ge00_switch_board_info;
+static __initdata struct mdio_board_info orion_ge00_switch_board_info = {
+       .bus_id   = "orion-mii",
+       .modalias = "mv88e6085",
+};
 
 void __init orion_ge00_switch_init(struct dsa_chip_data *d)
 {
-       struct mdio_board_info *bd;
        unsigned int i;
 
        if (!IS_BUILTIN(CONFIG_PHYLIB))
                return;
 
-       for (i = 0; i < ARRAY_SIZE(d->port_names); i++)
-               if (!strcmp(d->port_names[i], "cpu"))
+       for (i = 0; i < ARRAY_SIZE(d->port_names); i++) {
+               if (!strcmp(d->port_names[i], "cpu")) {
+                       d->netdev[i] = &orion_ge00.dev;
                        break;
+               }
+       }
 
-       bd = &orion_ge00_switch_board_info;
-       bd->bus_id = orion_ge00_mvmdio_bus_name;
-       bd->mdio_addr = d->sw_addr;
-       d->netdev[i] = &orion_ge00.dev;
-       strcpy(bd->modalias, "mv88e6085");
-       bd->platform_data = d;
+       orion_ge00_switch_board_info.mdio_addr = d->sw_addr;
+       orion_ge00_switch_board_info.platform_data = d;
 
        mdiobus_register_board_info(&orion_ge00_switch_board_info, 1);
 }