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ethernet: s2io: fix setting mac address during resume

PATCH Applied Arnd Bergmann 2 participants 2 messages Oct 13, 2021 – Oct 14, 2021

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PATCH 1/1 ethernet: s2io: fix setting mac address during resume

From: Arnd Bergmann <[email protected]>

After recent cleanups, gcc started warning about a suspicious memcpy() call during the s2io_io_resume() function:

In function '__dev_addr_set',
inlined from 'eth_hw_addr_set' at include/linux/etherdevice.h:318:2,
inlined from 's2io_set_mac_addr' at drivers/net/ethernet/neterion/s2io.c:5205:2,
inlined from 's2io_io_resume' at drivers/net/ethernet/neterion/s2io.c:8569:7:
arch/x86/include/asm/string_32.h:182:25: error: '__builtin_memcpy' accessing 6 bytes at offsets 0 and 2 overlaps 4 bytes at offset 2 [-Werror=restrict]
182 | #define memcpy(t, f, n) __builtin_memcpy(t, f, n)

      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netdevice.h:4648:9: note: in expansion of macro 'memcpy'
 4648 |         memcpy(dev->dev_addr, addr, len);
      |         ^~~~~~

What apparently happened is that an old cleanup changed the calling conventions for s2io_set_mac_addr() from taking an ethernet address as a character array to taking a struct sockaddr, but one of the callers was not changed at the same time.

Change it to instead call the low-level do_s2io_prog_unicast() function that still takes the old argument type.

Fixes 2fd376884558 ("S2io: Added support set_mac_address driver entry point")
---
 drivers/net/ethernet/neterion/s2io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
drivers/net/ethernet/neterion/s2io.c +1 -1
index 5454c1c2f8ad..ade47c4fdae0 100644
@@ -8566,7 +8566,7 @@ static void s2io_io_resume(struct pci_dev *pdev)
 			return;
 		}
 
-		if (s2io_set_mac_addr(netdev, netdev->dev_addr) == FAILURE) {
+		if (do_s2io_prog_unicast(netdev, netdev->dev_addr) == FAILURE) {
 			s2io_card_down(sp);
 			pr_err("Can't restore mac addr after reset.\n");
 			return;
Signature · 1 line
2.29.2
#1 lore raw
This patch was applied to netdev/net.git (master) by Jakub Kicinski <[email protected]>:

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <[email protected]>:

Quoted 11 lines · On Wed, 13 Oct 2021 16:35:49 +0200 you wrote:

From: Arnd Bergmann <[email protected]>

After recent cleanups, gcc started warning about a suspicious memcpy() call during the s2io_io_resume() function:

In function '__dev_addr_set',
inlined from 'eth_hw_addr_set' at include/linux/etherdevice.h:318:2,
inlined from 's2io_set_mac_addr' at drivers/net/ethernet/neterion/s2io.c:5205:2,
inlined from 's2io_io_resume' at drivers/net/ethernet/neterion/s2io.c:8569:7:
arch/x86/include/asm/string_32.h:182:25: error: '__builtin_memcpy' accessing 6 bytes at offsets 0 and 2 overlaps 4 bytes at offset 2 [-Werror=restrict]
182 | #define memcpy(t, f, n) __builtin_memcpy(t, f, n)

Quoted 6 lines
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/netdevice.h:4648:9: note: in expansion of macro 'memcpy'
 4648 |         memcpy(dev->dev_addr, addr, len);
      |         ^~~~~~

[...]

Here is the summary with links:
- ethernet: s2io: fix setting mac address during resume

    https://git.kernel.org/netdev/net/c/40507e7aada8

You are awesome, thank you!
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