powerpc/spufs: Fix spinning in spufs_ps_fault on signal

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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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This commit is contained in:

Jeremy Kerr 2008-11-11 10:22:22 +11:00

parent 34318c253b

commit 606572634c

1 changed files with 3 additions and 0 deletions

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arch/powerpc/platforms/cell/spufs/file.c

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