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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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1 changed files with 4 additions and 2 deletions
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@ -835,7 +835,8 @@ static void r4k_flush_icache_user_range(unsigned long start, unsigned long end)
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static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
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{
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/* Catch bad driver code */
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BUG_ON(size == 0);
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if (WARN_ON(size == 0))
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return;
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preempt_disable();
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if (cpu_has_inclusive_pcaches) {
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@ -871,7 +872,8 @@ static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
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static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
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{
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/* Catch bad driver code */
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BUG_ON(size == 0);
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if (WARN_ON(size == 0))
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return;
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preempt_disable();
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if (cpu_has_inclusive_pcaches) {
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