linux-kernel - [PATCH V2] crypto: omap-des - handle error of pm_runtime_get

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Date:	Tue, 15 Apr 2014 11:58:31 -0500
From:	Nishanth Menon <nm@...com>
To:	Joel Fernandes <joelf@...com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
CC:	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	Joachim Eastwood <manabian@...il.com>, <balbi@...com>,
	Nishanth Menon <nm@...com>
Subject: [PATCH V2] 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@...com>
---
V2:
	- review fixes, print function names in error log as well.

V1: https://patchwork.kernel.org/patch/3993861/
 drivers/crypto/omap-des.c |   26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
index ec5f131..1d570c4 100644
--- 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;
@@ -1083,7 +1090,12 @@ 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);
 
@@ -1148,6 +1160,7 @@ err_algs:
 err_irq:
 	tasklet_kill(&dd->done_task);
 	tasklet_kill(&dd->queue_task);
+err_get:
 	pm_runtime_disable(dev);
 err_res:
 	dd = NULL;
@@ -1191,7 +1204,14 @@ 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
-- 
1.7.9.5

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