The arm64 kernel will shortly disallow nested kernel mode NEON, so
add a fallback to scalar C code that can be invoked in that case.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
arch/arm64/crypto/crct10dif-ce-glue.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/crypto/crct10dif-ce-glue.c b/arch/arm64/crypto/crct10dif-ce-glue.c
index 60cb590c2590..96f0cae4a022 100644
--- a/arch/arm64/crypto/crct10dif-ce-glue.c
+++ b/arch/arm64/crypto/crct10dif-ce-glue.c
@@ -1,7 +1,7 @@
/*
* Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions
*
- * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@xxxxxxxxxx>
+ * Copyright (C) 2016 - 2017 Linaro Ltd <ard.biesheuvel@xxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -18,6 +18,7 @@
#include <crypto/internal/hash.h>
#include <asm/neon.h>
+#include <asm/simd.h>
#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U
@@ -48,9 +49,13 @@ static int crct10dif_update(struct shash_desc *desc, const u8 *data,
}
if (length > 0) {
- kernel_neon_begin_partial(14);
- *crc = crc_t10dif_pmull(*crc, data, length);
- kernel_neon_end();
+ if (may_use_simd()) {
+ kernel_neon_begin();
+ *crc = crc_t10dif_pmull(*crc, data, length);
+ kernel_neon_end();
+ } else {
+ *crc = crc_t10dif_generic(*crc, data, length);
+ }
}
return 0;
--
2.7.4
