From: Jiada Wang <jiada_wang@mentor.com>
To: <nick@shmanahar.org>, <dmitry.torokhov@gmail.com>
Cc: <linux-input@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<jiada_wang@mentor.com>, <george_davis@mentor.com>
Subject: [PATCH v1 19/63] Input: atmel_mxt_ts - check data->input_dev is not null in mxt_input_sync()
Date: Fri, 16 Aug 2019 17:32:13 +0900 [thread overview]
Message-ID: <20190816083257.18546-5-jiada_wang@mentor.com> (raw)
In-Reply-To: <20190816083257.18546-1-jiada_wang@mentor.com>
From: Janus Cheng <drxaero@gmail.com>
* Symptom: if update_fw and update_cfg, kernel panic occurs.
* Reproducibility: 10%
* Root Cause:
- If update_fw, the T6 will send a CFG_ERR message periodically.
- After that, update_cfg process begin, the mxt_update_cfg_store() will
invoke mxt_free_input_device() and nullify data->input_dev.
- The CFG_ERR message will trigger mxt_interrupt(), and mxt_input_sync()
will be invoked by mxt_process_messages_t44(). And mxt_input_sync()
references a NULL data->input_dev and kernel panic occurs.
TrackerRMS TKT-004235
Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
(cherry picked from ndyer/linux/for-upstream commit c909ada856861f305653b127db3ea0fa60264331)
[gdavis: Resolve forward port conflicts due to applying upstream
commit 96a938aa214e ("Input: atmel_mxt_ts - remove platform
data support").]
Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index a4f8364ecca9..99e5c84d207a 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -837,9 +837,11 @@ static void mxt_input_button(struct mxt_data *data, u8 *message)
static void mxt_input_sync(struct mxt_data *data)
{
- input_mt_report_pointer_emulation(data->input_dev,
- data->t19_num_keys);
- input_sync(data->input_dev);
+ if (data->input_dev) {
+ input_mt_report_pointer_emulation(data->input_dev,
+ data->t19_num_keys);
+ input_sync(data->input_dev);
+ }
}
static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
--
2.19.2
prev parent reply other threads:[~2019-08-16 8:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-16 8:32 [PATCH v1 15/63] Input: atmel_mxt_ts - allow specification of firmware file name Jiada Wang
2019-08-16 8:32 ` [PATCH v1 16/63] Input: atmel_mxt_ts - handle cfg filename via pdata/sysfs Jiada Wang
2019-08-16 8:32 ` [PATCH v1 17/63] Input: atmel_mxt_ts - allow input name to be specified in platform data Jiada Wang
2019-08-16 8:32 ` [PATCH v1 18/63] Input: atmel_mxt_ts - add config checksum attribute to sysfs Jiada Wang
2019-08-16 8:32 ` Jiada Wang [this message]
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