netdev - Re: smsc95xx: detect chip revision specific features

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Date:	Tue, 27 Nov 2012 12:32:26 +0000
From:	Steve Glendinning <steve@...well.net>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: smsc95xx: detect chip revision specific features

Hi Dan,

> drivers/net/usb/smsc95xx.c
>   1283          if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
>   1284                  u32 *filter_mask = kzalloc(32, GFP_KERNEL);
>                                                    ^^
> We allocate 8 unsigned 32 bit values.  I think this is the mistake here
> actually.  It is a typo and should say:
>
>                         u32 *filter_mask = kzalloc(sizeof(u32) * 32, GFP_KERNEL);
>
> If 8 elements was the intent then that's nasty.

Good spot!  8 32-bit elements was the intent, but all the following
code is actually accessing it using what should be byte offsets.  So I
think this should read:

    u8 *filter_mask = kzalloc(32, GFP_KERNEL);

The rest of the code following makes sense then, up until:

>   1349                          ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);

Which we'll need to change so it dereferences a u32 at that offset
instead of a u8, something like *((u32 *)&filter_mask[i])

If this looks good to you I'll prepare a patch?

Steve
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