Oops on linux-next during reboot, possibly related to "mmc: core: Handle card shutdown from mmc_bus"

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Hi,

On next-20130628 I get the following Oops during reboot:
[   89.814921] Unable to handle kernel NULL pointer dereference at virtual address 0000004c
[   89.824208] pgd = ecd54000
[   89.827276] [0000004c] *pgd=00000000
[   89.831340] Internal error: Oops: 5 [#1] PREEMPT SMP ARM

[<c040b244>] (mmc_bus_shutdown+0x24/0x70) from [<c032aa6c>] (device_shutdown+0x44/0x19c)
[<c032aa6c>] (device_shutdown+0x44/0x19c) from [<c0054508>] (kernel_restart_prepare+0x44/0x48)
[<c0054508>] (kernel_restart_prepare+0x44/0x48) from [<c0054528>] (kernel_restart+0x1c/0x70)
[<c0054528>] (kernel_restart+0x1c/0x70) from [<c0054704>] (SyS_reboot+0x168/0x1f0)
[<c0054704>] (SyS_reboot+0x168/0x1f0) from [<c000ed00>] (ret_fast_syscall+0x0/0x30)

The corresponding line in mmc_bus_shutdown is "drv->shutdown(card);"
and 'drv' seems indeed to be NULL.
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