dgnc_driver_pollrate_store needs to take a lock before modifying the
shared variable dgnc_poll_tick.
Signed-off-by: Salah Triki <salah.triki@xxxxxxx>
---
drivers/staging/dgnc/dgnc_sysfs.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/dgnc/dgnc_sysfs.c b/drivers/staging/dgnc/dgnc_sysfs.c
index 44db870..204ae05 100644
--- a/drivers/staging/dgnc/dgnc_sysfs.c
+++ b/drivers/staging/dgnc/dgnc_sysfs.c
@@ -57,10 +57,20 @@ static ssize_t dgnc_driver_pollrate_store(struct device_driver *ddp,
const char *buf, size_t count)
{
int ret;
+ int tick;
+ static DEFINE_MUTEX(mut);
- ret = sscanf(buf, "%d\n", &dgnc_poll_tick);
+ ret = sscanf(buf, "%d\n", &tick);
if (ret != 1)
return -EINVAL;
+
+ ret = mutex_lock_interruptible(&mut);
+ if (ret)
+ return -ERESTARTSYS;
+
+ dgnc_poll_tick = tick;
+
+ mutex_unlock(&mut);
return count;
}
static DRIVER_ATTR(pollrate, (S_IRUSR | S_IWUSR), dgnc_driver_pollrate_show,
--
1.9.1
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