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

diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 1b4b583..a9ef057 100644 (file)
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -835,7 +835,8 @@ static void r4k_flush_icache_user_range(unsigned long start, unsigned long end)
 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 {
        /* Catch bad driver code */
-       BUG_ON(size == 0);
+       if (WARN_ON(size == 0))
+               return;
 
        preempt_disable();
        if (cpu_has_inclusive_pcaches) {
@@ -871,7 +872,8 @@ static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 {
        /* Catch bad driver code */
-       BUG_ON(size == 0);
+       if (WARN_ON(size == 0))
+               return;
 
        preempt_disable();
        if (cpu_has_inclusive_pcaches) {