On Sun, 9 Dec 2007 19:41:58 +0000 (GMT)
Chris Rankin <[email protected]> wrote:
> Hi,
>
> I've recently been having trouble loading the hostap_plx 802.11b
> wireless networking driver, and this evening I managed to narrow the
> problem down to these lines of code by copying code from hostap_plx
> into a "test driver" until the test driver also locked the PC up:
>
> /* read CIS; it is in even offsets in the beginning of
> attr_mem */ for (i = 0; i < CIS_MAX_LEN; i++)
> cis[i] = readb(attr_mem + 2 * i);
>
> If I comment these lines out then my test driver just complains about
> the garbage CIS information and fails gracefully. Leave these lines
> in and my PC freezes instantly.
>
> These lines are part of the prism2_plx_check_cis() function, which is
> called when the module first loads. CIX_MAX_LEN is a #define for 256,
> and cis is a u8* pointer previously allocated as:
>
> cis = kmalloc(CIS_MAX_LEN, GFP_KERNEL);
>
> attr_mem is one of the function's paramters, and is defined as void
> __iomem *attr_mem.
can you check if the attr_mem is properly ioremap'd ?
(probably with ioremap_nocache)
> Region 2: Memory at e8002000 (32-bit, non-prefetchable)
> [size=4K] Region 3: I/O ports at 1080 [size=64]
>
> so there is apparently 4K of I/O memory at 0xe8002000.
>
> Can anyone help me understand why my PC is locking up when it
> executes this code, please?
I wonder if there's anything else in that area as well..
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