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[media] iguanair: do not modify transmit buffer 

Since commit "[media] rc-core: move timeout and checks to lirc", the
incoming buffer is used after the driver transmits.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sean Young 2012-08-25 07:01:45 -03:00 committed by Mauro Carvalho Chehab
parent aa740e0a6f
commit 3920631c4b
1 changed files with 21 additions and 30 deletions
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51
drivers/media/rc/iguanair.c
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@ -334,21 +334,34 @@ static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
{
struct iguanair *ir = dev->priv;
uint8_t space, *payload;
unsigned i, size, rc, bytes;
uint8_t space;
unsigned i, size, periods, bytes;
int rc;
struct send_packet *packet;
mutex_lock(&ir->lock);
packet = kmalloc(sizeof(*packet) + ir->bufsize, GFP_KERNEL);
if (!packet) {
rc = -ENOMEM;
goto out;
}
/* convert from us to carrier periods */
for (i = size = 0; i < count; i++) {
txbuf[i] = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
bytes = (txbuf[i] + 126) / 127;
for (i = space = size = 0; i < count; i++) {
periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
bytes = DIV_ROUND_UP(periods, 127);
if (size + bytes > ir->bufsize) {
count = i;
break;
}
size += bytes;
while (periods > 127) {
packet->payload[size++] = 127 | space;
periods -= 127;
}
packet->payload[size++] = periods | space;
space ^= 0x80;
}
if (count == 0) {
@ -356,12 +369,6 @@ static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
goto out;
}
packet = kmalloc(sizeof(*packet) + size, GFP_KERNEL);
if (!packet) {
rc = -ENOMEM;
goto out;
}
packet->header.start = 0;
packet->header.direction = DIR_OUT;
packet->header.cmd = CMD_SEND;
@ -370,26 +377,11 @@ static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
packet->busy7 = ir->busy7;
packet->busy4 = ir->busy4;
space = 0;
payload = packet->payload;
for (i = 0; i < count; i++) {
unsigned periods = txbuf[i];
while (periods > 127) {
*payload++ = 127 | space;
periods -= 127;
}
*payload++ = periods | space;
space ^= 0x80;
}
if (ir->receiver_on) {
rc = iguanair_receiver(ir, false);
if (rc) {
dev_warn(ir->dev, "disable receiver before transmit failed\n");
goto out_kfree;
goto out;
}
}
@ -405,9 +397,8 @@ static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
dev_warn(ir->dev, "re-enable receiver after transmit failed\n");
}
out_kfree:
kfree(packet);
out:
kfree(packet);
mutex_unlock(&ir->lock);
return rc ? rc : count;