linux-kernel - [PATCH 3.12 121/124] HID: hid-sensor-hub: fix sleeping function called from invalid context

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Date:	Tue, 28 Jul 2015 11:53:02 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Oliver Neukum <ONeukum@...e.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 121/124] HID: hid-sensor-hub: fix sleeping function called from invalid context

From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit f74346a04b79c9a5e50a2ee5e923b94195975d17 upstream.

Fix issue with the sleeping calling hid_hw_request under spinlock.
When i2c is used as HID transport, this is calling kmalloc, which
can sleep. So remove call to this function while under spinlock.
 [ 1067.021961] Call Trace:
 [ 1067.021970]  [<ffffffff8192f5f2>] dump_stack+0x4d/0x6f
 [ 1067.021976]  [<ffffffff811109f2>] __might_sleep+0xd2/0xf0
 [ 1067.021981]  [<ffffffff811ea15b>] __kmalloc+0xeb/0x200
 [ 1067.021989]  [<ffffffff816e0cb3>] ? hid_alloc_report_buf+0x23/0x30
 [ 1067.021993]  [<ffffffff816e0cb3>] hid_alloc_report_buf+0x23/0x30
 [ 1067.021997]  [<ffffffff816f4cb7>] i2c_hid_request+0x57/0x110
 [ 1067.022006]  [<ffffffffa02bc61c>] sensor_hub_input_attr_get_raw_value+0xbc/0x100 [hid_sensor_hub]

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Cc: Oliver Neukum <ONeukum@...e.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/hid/hid-sensor-hub.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index 9e4cdca549c0..fe8618c5b5c1 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -255,13 +255,12 @@ int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 
 	spin_lock_irqsave(&data->lock, flags);
 	data->pending.status = true;
+	spin_unlock_irqrestore(&data->lock, flags);
 	report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT);
-	if (!report) {
-		spin_unlock_irqrestore(&data->lock, flags);
+	if (!report)
 		goto err_free;
-	}
+
 	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
-	spin_unlock_irqrestore(&data->lock, flags);
 	wait_for_completion_interruptible_timeout(&data->pending.ready, HZ*5);
 	switch (data->pending.raw_size) {
 	case 1:
-- 
2.4.6

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