linux-kernel - [PATCH v3 11/18] Input: synaptics-rmi4 - f03: grab data passed by transport device

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1476373872-18027-12-git-send-email-benjamin.tissoires@redhat.com>
Date:   Thu, 13 Oct 2016 17:51:05 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Andrew Duggan <aduggan@...aptics.com>,
        Lyude Paul <thatslyude@...il.com>,
        Christopher Heiny <cheiny@...aptics.com>,
        Nick Dyer <nick@...anahar.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Dennis Wassenberg <dennis.wassenberg@...unet.com>
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH v3 11/18] Input: synaptics-rmi4 - f03: grab data passed by transport device

From: Dennis Wassenberg <dennis.wassenberg@...unet.com>

First check if there are data available passed by the transport device.
If data available use these data. If there are no data available
try to read the rmi block if dsata are passed this way.

This is the way the other rmi function handlers will do this.

This patch is needed on HID devices because the firmware reads F03 data
registers and adds them to the HID attention report. Reading those registers
from the driver after the firmware read them will result in invalid data.
Which is exactly what Dennis is describing here.

Reviewed-by: Andrew Duggan <aduggan@...aptics.com>
Signed-off-by: Dennis Wassenberg <dennis.wassenberg@...unet.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

---

no changes in v3

changes in v2:
- fixed commit message to include Andrew's explanation
---
 drivers/input/rmi4/rmi_f03.c | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

diff --git a/drivers/input/rmi4/rmi_f03.c b/drivers/input/rmi4/rmi_f03.c
index a7e1b98..a124b33 100644
--- a/drivers/input/rmi4/rmi_f03.c
+++ b/drivers/input/rmi4/rmi_f03.c
@@ -159,6 +159,7 @@ static int rmi_f03_config(struct rmi_function *fn)
 
 static int rmi_f03_attention(struct rmi_function *fn, unsigned long *irq_bits)
 {
+	struct rmi_device *rmi_dev = fn->rmi_dev;
 	struct f03_data *f03 = dev_get_drvdata(&fn->dev);
 	u16 data_addr = fn->fd.data_base_addr;
 	const u8 ob_len = f03->rx_queue_length * RMI_F03_OB_SIZE;
@@ -167,16 +168,32 @@ static int rmi_f03_attention(struct rmi_function *fn, unsigned long *irq_bits)
 	u8 ob_data;
 	unsigned int serio_flags;
 	int i;
-	int retval;
-
-	/* Grab all of the data registers, and check them for data */
-	retval = rmi_read_block(fn->rmi_dev, data_addr + RMI_F03_OB_OFFSET,
-				&obs, ob_len);
-	if (retval) {
-		dev_err(&fn->dev, "%s: Failed to read F03 output buffers.\n",
-			__func__);
-		serio_interrupt(f03->serio, 0, SERIO_TIMEOUT);
-		return retval;
+	int ret;
+
+	if (!rmi_dev || !rmi_dev->xport)
+		return -ENODEV;
+
+	if (rmi_dev->xport->attn_data) {
+		/* First grab the data passed by the transport device */
+		if (rmi_dev->xport->attn_size < ob_len) {
+			dev_warn(&fn->dev, "F03 interrupted, but data is missing!\n");
+			return 0;
+		}
+
+		memcpy(obs, rmi_dev->xport->attn_data, ob_len);
+
+		rmi_dev->xport->attn_data += ob_len;
+		rmi_dev->xport->attn_size -= ob_len;
+	} else {
+		/* Grab all of the data registers, and check them for data */
+		ret = rmi_read_block(fn->rmi_dev, data_addr + RMI_F03_OB_OFFSET,
+				     &obs, ob_len);
+		if (ret) {
+			dev_err(&fn->dev, "%s: Failed to read F03 output buffers.\n",
+				__func__);
+			serio_interrupt(f03->serio, 0, SERIO_TIMEOUT);
+			return ret;
+		}
 	}
 
 	for (i = 0; i < ob_len; i += RMI_F03_OB_SIZE) {
-- 
2.7.4