From: Jeremy Kerr <jk@ozlabs.org>
Date: Mon, 10 Nov 2008 23:22:22 +0000 (+1100)
Subject: powerpc/spufs: Fix spinning in spufs_ps_fault on signal
X-Git-Tag: v2.6.28-rc7~37^2~6^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=606572634c3faa5b32a8fc430266e6e9d78d2179;p=pandora-kernel.git

powerpc/spufs: Fix spinning in spufs_ps_fault on signal

Currently, we can end up in an infinite loop if we get a signal
while the kernel has faulted in spufs_ps_fault. Eg:

 alarm(1);

 write(fd, some_spu_psmap_register_address, 4);

- the write's copy_from_user will fault on the ps mapping, and
signal_pending will be non-zero. Because returning from the fault
handler will never clear TIF_SIGPENDING, so we'll just keep faulting,
resulting in an unkillable process using 100% of CPU.

This change returns VM_FAULT_SIGBUS if there's a fatal signal pending,
letting us escape the loop.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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