backports: add pci_zalloc_consistent()

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/backport/backport-include/asm-generic/pci-dma-compat.h b/backport/backport-include/asm-generic/pci-dma-compat.h
new file mode 100644 (file)
index 0000000..ed48774
--- /dev/null
+++ b/backport/backport-include/asm-generic/pci-dma-compat.h
@@ -0,0 +1,17 @@
+#ifndef __BACKPORT_ASM_GENERIC_PCI_DMA_COMPAT_H
+#define __BACKPORT_ASM_GENERIC_PCI_DMA_COMPAT_H
+#include_next <asm-generic/pci-dma-compat.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,17,0)
+#define pci_zalloc_consistent LINUX_BACKPORT(pci_zalloc_consistent)
+static inline void *pci_zalloc_consistent(struct pci_dev *hwdev, size_t size,
+                                         dma_addr_t *dma_handle)
+{
+       void *ret = pci_alloc_consistent(hwdev, size, dma_handle);
+       if (ret)
+               memset(ret, 0, size);
+       return ret;
+}
+#endif
+
+#endif /* __BACKPORT_ASM_GENERIC_PCI_DMA_COMPAT_H */