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[PATCH] powerpc: IOMMU: don't ioremap null addresses
240-ioremap-null-ptr-test.patch Under highly unusual circumstances, a buggy driver will ask a null ptr to be ioremapped, an operation that curently succeeds but leads to later trouble. Instead, refuse to remap the null pointer. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> (cherry picked from e71d9e598533c1889e7162f5f4647e5d378c102c commit)
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@ -174,7 +174,7 @@ void __iomem * __ioremap(unsigned long addr, unsigned long size,
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pa = addr & PAGE_MASK;
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size = PAGE_ALIGN(addr + size) - pa;
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if (size == 0)
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if ((size == 0) || (pa == 0))
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return NULL;
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if (mem_init_done) {
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