[PATCH RFT] HID: sensor-hub: don't hold spin lock while calling kzalloc with GFP_KERNEL

Subsystems: hid core layer, hid sensor hub drivers, the rest

STALE5093d

2 messages, 2 authors, 2012-09-16 · open the first message on its own page

[PATCH RFT] HID: sensor-hub: don't hold spin lock while calling kzalloc with GFP_KERNEL

From: Axel Lin <hidden>
Date: 2012-09-16 02:58:33

kzalloc might cause sleep, so don't hold spin lock while calling kzalloc with
GFP_KERNEL.

Signed-off-by: Axel Lin <redacted>
---
 drivers/hid/hid-sensor-hub.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index 4ac759c..162bf6a 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -173,14 +173,17 @@ int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 			spin_unlock(&pdata->dyn_callback_lock);
 			return -EINVAL;
 		}
+	spin_unlock(&pdata->dyn_callback_lock);
+
 	callback = kzalloc(sizeof(*callback), GFP_KERNEL);
-	if (!callback) {
-		spin_unlock(&pdata->dyn_callback_lock);
+	if (!callback)
 		return -ENOMEM;
-	}
+
 	callback->usage_callback = usage_callback;
 	callback->usage_id = usage_id;
 	callback->priv = NULL;
+
+	spin_lock(&pdata->dyn_callback_lock);
 	list_add_tail(&callback->list, &pdata->dyn_callback_list);
 	spin_unlock(&pdata->dyn_callback_lock);
 
-- 
1.7.9.5


RE: [PATCH RFT] HID: sensor-hub: don't hold spin lock while calling kzalloc with GFP_KERNEL

From: Pandruvada, Srinivas <hidden>
Date: 2012-09-16 03:31:00

There is already a patch submitted to change to GFP_ATOMIC, which address this.

-----Original Message-----
From: Axel Lin [mailto:axel.lin@gmail.com] 
Sent: Saturday, September 15, 2012 7:58 PM
To: Jiri Kosina
Cc: Pandruvada, Srinivas; Jonathan Cameron; linux-input@vger.kernel.org
Subject: [PATCH RFT] HID: sensor-hub: don't hold spin lock while calling kzalloc with GFP_KERNEL

kzalloc might cause sleep, so don't hold spin lock while calling kzalloc with GFP_KERNEL.

Signed-off-by: Axel Lin <redacted>
---
 drivers/hid/hid-sensor-hub.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c index 4ac759c..162bf6a 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -173,14 +173,17 @@ int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 			spin_unlock(&pdata->dyn_callback_lock);
 			return -EINVAL;
 		}
+	spin_unlock(&pdata->dyn_callback_lock);
+
 	callback = kzalloc(sizeof(*callback), GFP_KERNEL);
-	if (!callback) {
-		spin_unlock(&pdata->dyn_callback_lock);
+	if (!callback)
 		return -ENOMEM;
-	}
+
 	callback->usage_callback = usage_callback;
 	callback->usage_id = usage_id;
 	callback->priv = NULL;
+
+	spin_lock(&pdata->dyn_callback_lock);
 	list_add_tail(&callback->list, &pdata->dyn_callback_list);
 	spin_unlock(&pdata->dyn_callback_lock);
 
--
1.7.9.5


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