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skypopen: OSS driver, added some code from /dev/zero to read(), and performances are better

This commit is contained in:
Giovanni Maruzzelli 2010-12-27 07:49:24 -06:00
parent 4e95227f39
commit 7f81c3cc3c
1 changed files with 25 additions and 1 deletions
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26
src/mod/endpoints/mod_skypopen/oss/main.c
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@ -249,6 +249,7 @@ static ssize_t skypopen_read(struct file *filp, char __user *buf, size_t count,
loff_t *f_pos)
{
DEFINE_WAIT(wait);
size_t written;
struct skypopen_dev *dev = filp->private_data;
if(unload)
@ -273,8 +274,31 @@ static ssize_t skypopen_read(struct file *filp, char __user *buf, size_t count,
prepare_to_wait(&dev->inq, &wait, TASK_INTERRUPTIBLE);
schedule();
finish_wait(&dev->inq, &wait);
return count;
if (!count)
return 0;
if (!access_ok(VERIFY_WRITE, buf, count))
return -EFAULT;
written = 0;
while (count) {
unsigned long unwritten;
size_t chunk = count;
if (chunk > PAGE_SIZE)
chunk = PAGE_SIZE; /* Just for latency reasons */
unwritten = __clear_user(buf, chunk);
written += chunk - unwritten;
if (unwritten)
break;
if (signal_pending(current))
return written ? written : -ERESTARTSYS;
buf += chunk;
count -= chunk;
cond_resched();
}
return written ? written : -EFAULT;
}
static ssize_t skypopen_write(struct file *filp, const char __user *buf, size_t count,