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Subject[PATCH V2] crypto: omap-des - handle error of pm_runtime_get_sync
Date
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>
---
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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