crypto: omap-sham - do not schedule tasklet if there is no active requests

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 804c16bc2d61..6399a8f1938a 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -1085,6 +1085,11 @@ static irqreturn_t omap_sham_irq(int irq, void *dev_id)
                                  SHA_REG_CTRL_OUTPUT_READY);
         omap_sham_read(dd, SHA_REG_CTRL);
 
+        if (!test_bit(FLAGS_BUSY, &dd->flags)) {
+                dev_warn(dd->dev, "Interrupt when no active requests.\n");
+                return IRQ_HANDLED;
+        }
+
         set_bit(FLAGS_OUTPUT_READY, &dd->flags);
         tasklet_schedule(&dd->done_task);