From a644e4a3e95f8ca6eca019c92d8dfde101150687 Mon Sep 17 00:00:00 2001 From: Chris Pascoe Date: Mon, 19 Nov 2007 03:05:09 -0300 Subject: [PATCH] V4L/DVB (6627): CXUSB: handle write then read from different address The path to perform a read immediately after a write was not checking that the address being read from was the same as the one that was written. Handling this case correctly should mean that we now can handle more than two i2c messages at a time. Signed-off-by: Chris Pascoe Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb/dvb-usb/cxusb.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/media/dvb/dvb-usb/cxusb.c b/drivers/media/dvb/dvb-usb/cxusb.c index 016a3780b71..74eeb168f24 100644 --- a/drivers/media/dvb/dvb-usb/cxusb.c +++ b/drivers/media/dvb/dvb-usb/cxusb.c @@ -83,9 +83,6 @@ static int cxusb_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[], if (mutex_lock_interruptible(&d->i2c_mutex) < 0) return -EAGAIN; - if (num > 2) - warn("more than two i2c messages at a time is not handled yet. TODO."); - for (i = 0; i < num; i++) { if (d->udev->descriptor.idVendor == USB_VID_MEDION) @@ -111,8 +108,9 @@ static int cxusb_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[], break; } memcpy(msg[i].buf, &ibuf[1], msg[i].len); - } else if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) { - /* write then read */ + } else if (i+1 < num && (msg[i+1].flags & I2C_M_RD) && + msg[i].addr == msg[i+1].addr) { + /* write to then read from same address */ u8 obuf[3+msg[i].len], ibuf[1+msg[i+1].len]; obuf[0] = msg[i].len; obuf[1] = msg[i+1].len; -- 2.20.1