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fixing spurious wakeup while waiting for write pipe

pull/192/head
matteo serva 2024-03-05 22:33:18 +01:00
rodzic 75d25800bc
commit 7c6f853dc1
1 zmienionych plików z 10 dodań i 6 usunięć
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16
driver/smi_stream_dev.c
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@ -764,7 +764,6 @@ void transfer_thread_stop(struct bcm2835_smi_dev_instance *inst)
static int smi_stream_open(struct inode *inode, struct file *file)
{
int ret;
int dev = iminor(inode);
dev_dbg(inst->dev, "SMI device opened.");
@ -888,13 +887,18 @@ static ssize_t smi_stream_write_file(struct file *f, const char __user *user_ptr
if (mutex_lock_interruptible(&inst->write_lock))
{
return -EINTR;
return -EAGAIN;
}
if (kfifo_is_full(&inst->tx_fifo))
{
mutex_unlock(&inst->write_lock);
return -EAGAIN;
if(wait_event_interruptible(inst->poll_event, !kfifo_is_full(&inst->tx_fifo)))
{
mutex_unlock(&inst->write_lock);
return -EAGAIN;
}
}
// check how many bytes are available in the tx fifo
@ -915,14 +919,14 @@ static unsigned int smi_stream_poll(struct file *filp, struct poll_table_struct
poll_wait(filp, &inst->poll_event, wait);
if (inst->readable || !kfifo_is_empty(&inst->rx_fifo))
if (!kfifo_is_empty(&inst->rx_fifo))
{
//dev_info(inst->dev, "poll_wait result => readable=%d", inst->readable);
inst->readable = false;
mask |= ( POLLIN | POLLRDNORM );
}
if (inst->writeable)
if (!kfifo_is_full(&inst->rx_fifo))
{
//dev_info(inst->dev, "poll_wait result => writeable=%d", inst->writeable);
inst->writeable = false;