From 671ea6707b3fb051ec1bae8e7aa0a91f90e178e0 Mon Sep 17 00:00:00 2001 From: Sean Young Date: Mon, 8 Jul 2013 17:33:09 -0300 Subject: [PATCH] [media] lirc: make transmit interface consistent All lirc drivers that can transmit, return EINVAL when they are passed more than IR data than they can send. That is, except for two drivers which I touched. Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab --- Documentation/DocBook/media/v4l/lirc_device_interface.xml | 4 +++- drivers/media/rc/iguanair.c | 4 ++-- drivers/media/rc/redrat3.c | 7 ++++--- 3 files changed, 9 insertions(+), 6 deletions(-) diff --git a/Documentation/DocBook/media/v4l/lirc_device_interface.xml b/Documentation/DocBook/media/v4l/lirc_device_interface.xml index 8d7eb6bf631..34cada2ca71 100644 --- a/Documentation/DocBook/media/v4l/lirc_device_interface.xml +++ b/Documentation/DocBook/media/v4l/lirc_device_interface.xml @@ -46,7 +46,9 @@ describing an IR signal are read from the chardev. values. Pulses and spaces are only marked implicitly by their position. The data must start and end with a pulse, therefore, the data must always include an uneven number of samples. The write function must block until the data has -been transmitted by the hardware. +been transmitted by the hardware. If more data is provided than the hardware +can send, the driver returns EINVAL. +
diff --git a/drivers/media/rc/iguanair.c b/drivers/media/rc/iguanair.c index a4ab2e6b3f8..19632b1c219 100644 --- a/drivers/media/rc/iguanair.c +++ b/drivers/media/rc/iguanair.c @@ -364,8 +364,8 @@ static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count) periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000); bytes = DIV_ROUND_UP(periods, 127); if (size + bytes > ir->bufsize) { - count = i; - break; + rc = -EINVAL; + goto out; } while (periods > 127) { ir->packet->payload[size++] = 127 | space; diff --git a/drivers/media/rc/redrat3.c b/drivers/media/rc/redrat3.c index 37494433dc9..0042367b060 100644 --- a/drivers/media/rc/redrat3.c +++ b/drivers/media/rc/redrat3.c @@ -762,7 +762,8 @@ static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf, return -EAGAIN; } - count = min_t(unsigned, count, RR3_MAX_SIG_SIZE - RR3_TX_TRAILER_LEN); + if (count > RR3_MAX_SIG_SIZE - RR3_TX_TRAILER_LEN) + return -EINVAL; /* rr3 will disable rc detector on transmit */ rr3->transmitting = true; @@ -801,8 +802,8 @@ static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf, &irdata->lens[curlencheck]); curlencheck++; } else { - count = i - 1; - break; + ret = -EINVAL; + goto out; } } irdata->sigdata[i] = lencheck; -- 2.41.0