2 files changed, 50 insertions, 0 deletions

diff --git a/include/asm-x86/i387.h b/include/asm-x86/i387.h
index 96fa8449ff11..6d3b21063419 100644
--- a/include/asm-x86/i387.h
+++ b/include/asm-x86/i387.h
@@ -13,6 +13,7 @@
 #include <linux/sched.h>
 #include <linux/kernel_stat.h>
 #include <linux/regset.h>
+#include <linux/hardirq.h>
 #include <asm/asm.h>
 #include <asm/processor.h>
 #include <asm/sigcontext.h>
@@ -236,6 +237,37 @@ static inline void kernel_fpu_end(void)
         preempt_enable();
 }
 
+/*
+ * Some instructions like VIA's padlock instructions generate a spurious
+ * DNA fault but don't modify SSE registers. And these instructions
+ * get used from interrupt context aswell. To prevent these kernel instructions
+ * in interrupt context interact wrongly with other user/kernel fpu usage, we
+ * should use them only in the context of irq_ts_save/restore()
+ */
+static inline int irq_ts_save(void)
+{
+        /*
+         * If we are in process context, we are ok to take a spurious DNA fault.
+         * Otherwise, doing clts() in process context require pre-emption to
+         * be disabled or some heavy lifting like kernel_fpu_begin()
+         */
+        if (!in_interrupt())
+                return 0;
+
+        if (read_cr0() & X86_CR0_TS) {
+                clts();
+                return 1;
+        }
+
+        return 0;
+}
+
+static inline void irq_ts_restore(int TS_state)
+{
+        if (TS_state)
+                stts();
+}
+
 #ifdef CONFIG_X86_64
 
 static inline void save_init_fpu(struct task_struct *tsk)
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index d12498ec8a4e..ee48ef8fb2ea 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -101,6 +101,24 @@ static inline int crypto_ahash_digest(struct ahash_request *req)
         return crt->digest(req);
 }
 
+static inline int crypto_ahash_init(struct ahash_request *req)
+{
+        struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
+        return crt->init(req);
+}
+
+static inline int crypto_ahash_update(struct ahash_request *req)
+{
+        struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
+        return crt->update(req);
+}
+
+static inline int crypto_ahash_final(struct ahash_request *req)
+{
+        struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
+        return crt->final(req);
+}
+
 static inline void ahash_request_set_tfm(struct ahash_request *req,
                                          struct crypto_ahash *tfm)
 {