crypto: stm32/cryp - call finalize with bh disabled

The finalize operation in interrupt mode produce a produces a spinlock
recursion warning. The reason is the fact that BH must be disabled
during this process.

Signed-off-by: Maxime Méré <maxime.mere@foss.st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/stm32/stm32-cryp.c

@@ -11,6 +11,7 @@
 #include <crypto/internal/des.h>
 #include <crypto/internal/skcipher.h>
 #include <crypto/scatterwalk.h>
+#include <linux/bottom_half.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
@@ -2203,8 +2204,11 @@ static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg)
 		it_mask &= ~IMSCR_OUT;
 	stm32_cryp_write(cryp, cryp->caps->imsc, it_mask);
 
-	if (!cryp->payload_in && !cryp->header_in && !cryp->payload_out)
+	if (!cryp->payload_in && !cryp->header_in && !cryp->payload_out) {
+		local_bh_disable();
 		stm32_cryp_finish_req(cryp, 0);
+		local_bh_enable();
+	}
 
 	return IRQ_HANDLED;
 }