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authorAndreas Kemnade <andreas@kemnade.info>2019-01-24 07:34:35 +0100
committerJohan Hovold <johan@kernel.org>2019-01-25 11:35:06 +0100
commit196d91846099fb49b45fb14b0f47b9af3b721b94 (patch)
tree3f473500807d4b8657dd4d782e9033307c1bc092 /drivers/gnss
parent9f1623fdb399e5cf677f042e3bff3beec70376f6 (diff)
downloadlinux-196d91846099fb49b45fb14b0f47b9af3b721b94.tar.bz2
gnss: sirf: write data to gnss only when the gnss device is open
The api forbids writing data there otherwise. Prepare for the serdev_open()/close() being a part of sirf_set_active. Signed-off-by: Andreas Kemnade <andreas@kemnade.info> Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/gnss')
-rw-r--r--drivers/gnss/sirf.c32
1 files changed, 30 insertions, 2 deletions
diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c
index 59cde7e923b8..49bc021325e9 100644
--- a/drivers/gnss/sirf.c
+++ b/drivers/gnss/sirf.c
@@ -35,6 +35,10 @@ struct sirf_data {
struct gpio_desc *wakeup;
int irq;
bool active;
+
+ struct mutex gdev_mutex;
+ bool open;
+
wait_queue_head_t power_wait;
};
@@ -44,9 +48,18 @@ static int sirf_open(struct gnss_device *gdev)
struct serdev_device *serdev = data->serdev;
int ret;
+ mutex_lock(&data->gdev_mutex);
+ data->open = true;
+ mutex_unlock(&data->gdev_mutex);
+
ret = serdev_device_open(serdev);
- if (ret)
+ if (ret) {
+ mutex_lock(&data->gdev_mutex);
+ data->open = false;
+ mutex_unlock(&data->gdev_mutex);
return ret;
+ }
+
serdev_device_set_baudrate(serdev, data->speed);
serdev_device_set_flow_control(serdev, false);
@@ -63,6 +76,10 @@ static int sirf_open(struct gnss_device *gdev)
err_close:
serdev_device_close(serdev);
+ mutex_lock(&data->gdev_mutex);
+ data->open = false;
+ mutex_unlock(&data->gdev_mutex);
+
return ret;
}
@@ -74,6 +91,10 @@ static void sirf_close(struct gnss_device *gdev)
serdev_device_close(serdev);
pm_runtime_put(&serdev->dev);
+
+ mutex_lock(&data->gdev_mutex);
+ data->open = false;
+ mutex_unlock(&data->gdev_mutex);
}
static int sirf_write_raw(struct gnss_device *gdev, const unsigned char *buf,
@@ -105,8 +126,14 @@ static int sirf_receive_buf(struct serdev_device *serdev,
{
struct sirf_data *data = serdev_device_get_drvdata(serdev);
struct gnss_device *gdev = data->gdev;
+ int ret = 0;
- return gnss_insert_raw(gdev, buf, count);
+ mutex_lock(&data->gdev_mutex);
+ if (data->open)
+ ret = gnss_insert_raw(gdev, buf, count);
+ mutex_unlock(&data->gdev_mutex);
+
+ return ret;
}
static const struct serdev_device_ops sirf_serdev_ops = {
@@ -275,6 +302,7 @@ static int sirf_probe(struct serdev_device *serdev)
data->serdev = serdev;
data->gdev = gdev;
+ mutex_init(&data->gdev_mutex);
init_waitqueue_head(&data->power_wait);
serdev_device_set_drvdata(serdev, data);