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[PATCH] ibmasm driver: correctly wake up sleeping threads

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Due to my incomplete understanding of the wait_event_interruptible() function
threads waiting for service processor events were not woken up.  This patch
fixes that problem.

Signed-off-by: Max Asbock <masbock@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Max Asbock
2005-06-21 17:16:33 -07:00
committed by Linus Torvalds
parent f5ccc84231
commit b8acb80846
3 changed files with 40 additions and 14 deletions
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34
drivers/misc/ibmasm/ibmasmfs.c
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@@ -374,6 +374,7 @@ static int event_file_open(struct inode *inode, struct file *file)
ibmasm_event_reader_register(sp, &event_data->reader);
event_data->sp = sp;
event_data->active = 0;
file->private_data = event_data;
return 0;
}
@@ -391,7 +392,9 @@ static ssize_t event_file_read(struct file *file, char __user *buf, size_t count
{
struct ibmasmfs_event_data *event_data = file->private_data;
struct event_reader *reader = &event_data->reader;
struct service_processor *sp = event_data->sp;
int ret;
unsigned long flags;
if (*offset < 0)
return -EINVAL;
@@ -400,17 +403,32 @@ static ssize_t event_file_read(struct file *file, char __user *buf, size_t count
if (*offset != 0)
return 0;
ret = ibmasm_get_next_event(event_data->sp, reader);
spin_lock_irqsave(&sp->lock, flags);
if (event_data->active) {
spin_unlock_irqrestore(&sp->lock, flags);
return -EBUSY;
}
event_data->active = 1;
spin_unlock_irqrestore(&sp->lock, flags);
ret = ibmasm_get_next_event(sp, reader);
if (ret <= 0)
return ret;
goto out;
if (count < reader->data_size)
return -EINVAL;
if (count < reader->data_size) {
ret = -EINVAL;
goto out;
}
if (copy_to_user(buf, reader->data, reader->data_size))
return -EFAULT;
if (copy_to_user(buf, reader->data, reader->data_size)) {
ret = -EFAULT;
goto out;
}
ret = reader->data_size;
return reader->data_size;
out:
event_data->active = 0;
return ret;
}
static ssize_t event_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
@@ -424,7 +442,7 @@ static ssize_t event_file_write(struct file *file, const char __user *buf, size_
if (*offset != 0)
return 0;
wake_up_interruptible(&event_data->reader.wait);
ibmasm_cancel_next_event(&event_data->reader);
return 0;
}