MIPS: WARN_ON invalid DMA cache maintenance, not BUG_ON
If a driver causes DMA cache maintenance with a zero length then we currently BUG and kill the kernel. As this is a scenario that we may well be able to recover from, WARN & return in the condition instead. Signed-off-by: Paul Burton <paul.burton@mips.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/14623/ Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org
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