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staging: most: hdm-usb: add comment

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This patch adds a comment to function hdm_configure_channel() to clarify
its execution paths.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2016-10-28 14:46:20 +02:00 committed by Greg Kroah-Hartman
parent b536706192
commit 25e3854c83
1 changed files with 14 additions and 0 deletions
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14
drivers/staging/most/hdm-usb/hdm_usb.c
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@ -634,6 +634,15 @@ static int hdm_enqueue(struct most_interface *iface, int channel,
* @iface: interface
* @channel: channel ID
* @conf: structure that holds the configuration information
*
* The attached network interface controller (NIC) supports a padding mode
* to avoid short packets on USB, hence increasing the performance due to a
* lower interrupt load. This mode is default for synchronous data and can
* be switched on for isochronous data. In case padding is active the
* driver needs to know the frame size of the payload in order to calculate
* the number of bytes it needs to pad when transmitting or to cut off when
* receiving data.
*
*/
static int hdm_configure_channel(struct most_interface *iface, int channel,
struct most_channel_config *conf)
@ -667,6 +676,11 @@ static int hdm_configure_channel(struct most_interface *iface, int channel,
!(conf->data_type == MOST_CH_ISOC &&
conf->packets_per_xact != 0xFF)) {
mdev->padding_active[channel] = false;
/*
* Since the NIC's padding mode is not going to be
* used, we can skip the frame size calculations and
* move directly on to exit.
*/
goto exit;
}