hwmon: (corsair-cpro) Use a separate buffer for sending commands

[ Upstream commit e0cd85dc666cb08e1bd313d560cb4eff4d04219e ]

Introduce cmd_buffer, a separate buffer for storing only
the command that is sent to the device. Before this separation,
the existing buffer was shared for both the command and the
report received in ccp_raw_event(), which was copied into it.

However, because of hidraw, the raw event parsing may be triggered
in the middle of sending a command, resulting in outputting gibberish
to the device. Using a separate buffer resolves this.

Fixes: 40c3a4454225 ("hwmon: add Corsair Commander Pro driver")
Signed-off-by: Aleksa Savic <savicaleksa83@gmail.com>
Acked-by: Marius Zachmann <mail@mariuszachmann.de>
Link: https://lore.kernel.org/r/20240504092504.24158-2-savicaleksa83@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/hwmon/corsair-cpro.c b/drivers/hwmon/corsair-cpro.c
index fa6aa4fc8b5213dacccd954bb137219bf5644854..0a9cbb556188fb6fa399ea2ff08297a3bc26d6cf 100644 (file)
--- a/drivers/hwmon/corsair-cpro.c
+++ b/drivers/hwmon/corsair-cpro.c
@@ -79,6 +79,7 @@ struct ccp_device {
        struct device *hwmon_dev;
        struct completion wait_input_report;
        struct mutex mutex; /* whenever buffer is used, lock before send_usb_cmd */
+       u8 *cmd_buffer;
        u8 *buffer;
        int target[6];
        DECLARE_BITMAP(temp_cnct, NUM_TEMP_SENSORS);
@@ -111,15 +112,15 @@ static int send_usb_cmd(struct ccp_device *ccp, u8 command, u8 byte1, u8 byte2,
        unsigned long t;
        int ret;
 
-       memset(ccp->buffer, 0x00, OUT_BUFFER_SIZE);
-       ccp->buffer[0] = command;
-       ccp->buffer[1] = byte1;
-       ccp->buffer[2] = byte2;
-       ccp->buffer[3] = byte3;
+       memset(ccp->cmd_buffer, 0x00, OUT_BUFFER_SIZE);
+       ccp->cmd_buffer[0] = command;
+       ccp->cmd_buffer[1] = byte1;
+       ccp->cmd_buffer[2] = byte2;
+       ccp->cmd_buffer[3] = byte3;
 
        reinit_completion(&ccp->wait_input_report);
 
-       ret = hid_hw_output_report(ccp->hdev, ccp->buffer, OUT_BUFFER_SIZE);
+       ret = hid_hw_output_report(ccp->hdev, ccp->cmd_buffer, OUT_BUFFER_SIZE);
        if (ret < 0)
                return ret;
 
@@ -492,7 +493,11 @@ static int ccp_probe(struct hid_device *hdev, const struct hid_device_id *id)
        if (!ccp)
                return -ENOMEM;
 
-       ccp->buffer = devm_kmalloc(&hdev->dev, OUT_BUFFER_SIZE, GFP_KERNEL);
+       ccp->cmd_buffer = devm_kmalloc(&hdev->dev, OUT_BUFFER_SIZE, GFP_KERNEL);
+       if (!ccp->cmd_buffer)
+               return -ENOMEM;
+
+       ccp->buffer = devm_kmalloc(&hdev->dev, IN_BUFFER_SIZE, GFP_KERNEL);
        if (!ccp->buffer)
                return -ENOMEM;