swiotlb: add checks for the return value of memblock_alloc*()

[linux-2.6-microblaze.git] / kernel / dma / swiotlb.c

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 9f58510..dd6a8e2 100644 (file)
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -199,6 +199,7 @@ void __init swiotlb_update_mem_attributes(void)
 int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
 {
        unsigned long i, bytes;
+       size_t alloc_size;
 
        bytes = nslabs << IO_TLB_SHIFT;
 
@@ -211,12 +212,18 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
         * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
         * between io_tlb_start and io_tlb_end.
         */
-       io_tlb_list = memblock_alloc(
-                               PAGE_ALIGN(io_tlb_nslabs * sizeof(int)),
-                               PAGE_SIZE);
-       io_tlb_orig_addr = memblock_alloc(
-                               PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)),
-                               PAGE_SIZE);
+       alloc_size = PAGE_ALIGN(io_tlb_nslabs * sizeof(int));
+       io_tlb_list = memblock_alloc(alloc_size, PAGE_SIZE);
+       if (!io_tlb_list)
+               panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
+                     __func__, alloc_size, PAGE_SIZE);
+
+       alloc_size = PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t));
+       io_tlb_orig_addr = memblock_alloc(alloc_size, PAGE_SIZE);
+       if (!io_tlb_orig_addr)
+               panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
+                     __func__, alloc_size, PAGE_SIZE);
+
        for (i = 0; i < io_tlb_nslabs; i++) {
                io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
                io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;