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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 <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Chris Pascoe 2007-11-19 03:05:09 -03:00 committed by Mauro Carvalho Chehab
parent 272479d7ab
commit a644e4a3e9
1 changed files with 3 additions and 5 deletions
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8
drivers/media/dvb/dvb-usb/cxusb.c
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@ -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;