From: Wolfram Sang Date: Thu, 22 May 2025 08:09:54 +0000 (+0200) Subject: media: usb: hdpvr: disable zero-length read messages X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5ae5a79825ba8037b0be3ef677a24de8c063abf;p=thirdparty%2Flinux.git media: usb: hdpvr: disable zero-length read messages This driver passes the length of an i2c_msg directly to usb_control_msg(). If the message is now a read and of length 0, it violates the USB protocol and a warning will be printed. Enable the I2C_AQ_NO_ZERO_LEN_READ quirk for this adapter thus forbidding 0-length read messages altogether. Signed-off-by: Wolfram Sang Signed-off-by: Hans Verkuil --- diff --git a/drivers/media/usb/hdpvr/hdpvr-i2c.c b/drivers/media/usb/hdpvr/hdpvr-i2c.c index 070559b01b01b..54956a8ff15e8 100644 --- a/drivers/media/usb/hdpvr/hdpvr-i2c.c +++ b/drivers/media/usb/hdpvr/hdpvr-i2c.c @@ -165,10 +165,16 @@ static const struct i2c_algorithm hdpvr_algo = { .functionality = hdpvr_functionality, }; +/* prevent invalid 0-length usb_control_msg */ +static const struct i2c_adapter_quirks hdpvr_quirks = { + .flags = I2C_AQ_NO_ZERO_LEN_READ, +}; + static const struct i2c_adapter hdpvr_i2c_adapter_template = { .name = "Hauppauge HD PVR I2C", .owner = THIS_MODULE, .algo = &hdpvr_algo, + .quirks = &hdpvr_quirks, }; static int hdpvr_activate_ir(struct hdpvr_device *dev)