Since dgnc_poll_trick is a global variable.
Signed-off-by: Salah Triki <salah.tr...@acm.org>
---
drivers/staging/dgnc/dgnc_sysfs.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/dgnc/dgnc_sysfs.c
b/drivers/staging/dgnc/dgnc_sysfs.c
index 44db870..fe14b7a 100644
--- a/drivers/staging/dgnc/dgnc_sysfs.c
+++ b/drivers/staging/dgnc/dgnc_sysfs.c
@@ -26,6 +26,7 @@
#include "dgnc_driver.h"
#include "dgnc_mgmt.h"
+#DEFINE_MUTEX(mut);
static ssize_t dgnc_driver_version_show(struct device_driver *ddp, char *buf)
{
@@ -58,10 +59,20 @@ static ssize_t dgnc_driver_pollrate_store(struct
device_driver *ddp,
{
int ret;
+ ret = mutex_lock_interruptible(&mut);
+
+ if (ret)
+ return -ERESTARTSYS;
+
ret = sscanf(buf, "%d\n", &dgnc_poll_tick);
if (ret != 1)
- return -EINVAL;
- return count;
+ ret = -EINVAL;
+ else
+ ret = count;
+
+ mutex_unlock(&mut);
+
+ return ret;
}
static DRIVER_ATTR(pollrate, (S_IRUSR | S_IWUSR), dgnc_driver_pollrate_show,
dgnc_driver_pollrate_store);
--
1.9.1
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