diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tpiu.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tpiu.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c index c1b77e3c3187..63d9af31f57f 100644 --- a/drivers/hwtracing/coresight/coresight-tpiu.c +++ b/drivers/hwtracing/coresight/coresight-tpiu.c @@ -5,6 +5,7 @@ * Description: CoreSight Trace Port Interface Unit driver */ +#include <linux/atomic.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/device.h> @@ -73,7 +74,7 @@ static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused) struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); tpiu_enable_hw(drvdata); - + atomic_inc(csdev->refcnt); dev_dbg(drvdata->dev, "TPIU enabled\n"); return 0; } @@ -98,6 +99,9 @@ static int tpiu_disable(struct coresight_device *csdev) { struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + if (atomic_dec_return(csdev->refcnt)) + return -EBUSY; + tpiu_disable_hw(drvdata); dev_dbg(drvdata->dev, "TPIU disabled\n"); |