Messages in this thread |  | | Date | Fri, 05 Oct 2018 14:24:12 -0700 (PDT) | Subject | Re: [PATCH] usbnet: smsc95xx: simplify tx_fixup code | From | David Miller <> |
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From: Ben Dooks <ben.dooks@codethink.co.uk> Date: Tue, 2 Oct 2018 17:56:02 +0100
> - memcpy(skb->data, &tx_cmd_a, 4); > + ptr = skb_push(skb, 8); > + tx_cmd_a = cpu_to_le32(tx_cmd_a); > + tx_cmd_b = cpu_to_le32(tx_cmd_b); > + memcpy(ptr, &tx_cmd_a, 4); > + memcpy(ptr+4, &tx_cmd_b, 4);
Even a memcpy() through a void pointer does not guarantee that gcc will not emit word sized loads and stores.
You must use the get_unaligned()/put_unaligned() facilities to do this properly.
I also agree that making a proper type and structure instead of using a void pointer would be better.
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