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ipack/devices/ipoctal: Fix race condition during Tx 

In order to transmit data, the driver enables Tx and sleeps until
*board_write is set to 1 by the interrupt handler.

It can happen, though, that the data is sent even before the process
is asleep. In this case *board_write must be set to 1 anyway,
otherwise we will be waiting for a condition that will never be true.

Signed-off-by: Alberto Garcia <agarcia@igalia.com>
Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alberto Garcia 2012-12-10 11:49:57 +01:00 committed by Greg Kroah-Hartman
parent 8e9a4a9a5c
commit cc83f833c7
1 changed files with 4 additions and 7 deletions
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11
drivers/ipack/devices/ipoctal.c
View File

@ -195,13 +195,10 @@ static void ipoctal_irq_tx(struct ipoctal_channel *channel)
*pointer_write = *pointer_write % PAGE_SIZE;
channel->nb_bytes--;
if ((channel->nb_bytes == 0) &&
(waitqueue_active(&channel->queue))) {
if (channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
*channel->board_write = 1;
wake_up_interruptible(&channel->queue);
}
if (channel->nb_bytes == 0 &&
channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
*channel->board_write = 1;
wake_up_interruptible(&channel->queue);
}
}