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

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>

diff --git a/drivers/hwmon/corsair-cpro.c b/drivers/hwmon/corsair-cpro.c
index a284a02839fbbd83249c53eb0553c34615c4e22c..8d85f66f81435560cd0de8c0499571f174c526e4 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;