[BUG] IB/hfi1: might sleep under spinlock in hfi1_ioctl()

[Alexey Khoroshilov]

Hello,

hfi1_ioctl() contains many calls to might sleep functions with
dd->hfi1_snoop.snoop_lock spinlock held (for example, access_ok,
copy_from_user, kzalloc(GFP_KERNEL), etc.).

Should dd->hfi1_snoop.snoop_lock be acquired just before updating state?

Found by Linux Driver Verification project (linuxtesting.org).

--
Alexey Khoroshilov
Linux Verification Center, ISPRAS
web: http://linuxtesting.org

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