crypto: omap-des - handle error of pm_runtime_get_sync

pm_runtime_get_sync may not always succeed depending on SoC involved.
So handle the error appropriately ensuring usage_count is accurate in
case of failure.

Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Reported-by: Joachim Eastwood <manabian@gmail.com>
Tested-by: Joachim Eastwood <manabian@gmail.com>
Acked-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
index 4a13624..b8bc84b 100644 (file)
--- a/drivers/crypto/omap-des.c
+++ b/drivers/crypto/omap-des.c
@@ -223,12 +223,19 @@ static void omap_des_write_n(struct omap_des_dev *dd, u32 offset,
 
 static int omap_des_hw_init(struct omap_des_dev *dd)
 {
+       int err;
+
        /*
         * clocks are enabled when request starts and disabled when finished.
         * It may be long delays between requests.
         * Device might go to off mode to save power.
         */
-       pm_runtime_get_sync(dd->dev);
+       err = pm_runtime_get_sync(dd->dev);
+       if (err < 0) {
+               pm_runtime_put_noidle(dd->dev);
+               dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
+               return err;
+       }
 
        if (!(dd->flags & FLAGS_INIT)) {
                dd->flags |= FLAGS_INIT;
@@ -1082,7 +1089,12 @@ static int omap_des_probe(struct platform_device *pdev)
        dd->phys_base = res->start;
 
        pm_runtime_enable(dev);
-       pm_runtime_get_sync(dev);
+       err = pm_runtime_get_sync(dev);
+       if (err < 0) {
+               pm_runtime_put_noidle(dev);
+               dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
+               goto err_get;
+       }
 
        omap_des_dma_stop(dd);
 
@@ -1147,6 +1159,7 @@ err_algs:
 err_irq:
        tasklet_kill(&dd->done_task);
        tasklet_kill(&dd->queue_task);
+err_get:
        pm_runtime_disable(dev);
 err_res:
        dd = NULL;
@@ -1190,7 +1203,14 @@ static int omap_des_suspend(struct device *dev)
 
 static int omap_des_resume(struct device *dev)
 {
-       pm_runtime_get_sync(dev);
+       int err;
+
+       err = pm_runtime_get_sync(dev);
+       if (err < 0) {
+               pm_runtime_put_noidle(dev);
+               dev_err(dev, "%s: failed to get_sync(%d)\n", __func__, err);
+               return err;
+       }
        return 0;
 }
 #endif