crypto: omap-sham - Check for return value from pm_runtime_get_sync

Function pm_runtime_get_sync could fail and we need to check return
value to prevent kernel crash.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 20 insertions, 3 deletions

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 4d63e0d4da9a..a6703204fd86 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -362,7 +362,13 @@ static void omap_sham_copy_ready_hash(struct ahash_request *req)
 
 static int omap_sham_hw_init(struct omap_sham_dev *dd)
 {
-        pm_runtime_get_sync(dd->dev);
+        int err;
+
+        err = pm_runtime_get_sync(dd->dev);
+        if (err < 0) {
+                dev_err(dd->dev, "failed to get sync: %d\n", err);
+                return err;
+        }
 
         if (!test_bit(FLAGS_INIT, &dd->flags)) {
                 set_bit(FLAGS_INIT, &dd->flags);
@@ -1947,7 +1953,13 @@ static int omap_sham_probe(struct platform_device *pdev)
 
         pm_runtime_enable(dev);
         pm_runtime_irq_safe(dev);
-        pm_runtime_get_sync(dev);
+
+        err = pm_runtime_get_sync(dev);
+        if (err < 0) {
+                dev_err(dev, "failed to get sync: %d\n", err);
+                goto err_pm;
+        }
+
         rev = omap_sham_read(dd, SHA_REG_REV(dd));
         pm_runtime_put_sync(&pdev->dev);
 
@@ -1977,6 +1989,7 @@ err_algs:
                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
                         crypto_unregister_ahash(
                                         &dd->pdata->algs_info[i].algs_list[j]);
+err_pm:
         pm_runtime_disable(dev);
         if (dd->dma_lch)
                 dma_release_channel(dd->dma_lch);
@@ -2019,7 +2032,11 @@ static int omap_sham_suspend(struct device *dev)
 
 static int omap_sham_resume(struct device *dev)
 {
-        pm_runtime_get_sync(dev);
+        int err = pm_runtime_get_sync(dev);
+        if (err < 0) {
+                dev_err(dev, "failed to get sync: %d\n", err);
+                return err;
+        }
         return 0;
 }
 #endif