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authorChris Pascoe <c.pascoe@itee.uq.edu.au>2007-11-19 03:05:09 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-01-25 19:02:20 -0200
commita644e4a3e95f8ca6eca019c92d8dfde101150687 (patch)
treefd99aabaf1ab9e1bb1d88f98918f3ee4e08f9de3 /drivers/media/dvb/dvb-usb
parent272479d7ab067344d118e7633b624bf98f8896f3 (diff)
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>
Diffstat (limited to 'drivers/media/dvb/dvb-usb')
-rw-r--r--drivers/media/dvb/dvb-usb/cxusb.c8
1 files 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;