Commit b7a57cca authored by Martin Brandenburg's avatar Martin Brandenburg Committed by Mike Marshall

orangefs: return from orangefs_devreq_read quickly if possible

It is not necessary to take the lock and search through the request list
if the list is empty.
Signed-off-by: default avatarMartin Brandenburg <martin@omnibond.com>
Signed-off-by: default avatarMike Marshall <hubcap@omnibond.com>
parent 9d286b0d
...@@ -180,6 +180,10 @@ static ssize_t orangefs_devreq_read(struct file *file, ...@@ -180,6 +180,10 @@ static ssize_t orangefs_devreq_read(struct file *file,
return -EINVAL; return -EINVAL;
} }
/* Check for an empty list before locking. */
if (list_empty(&orangefs_request_list))
return -EAGAIN;
restart: restart:
/* Get next op (if any) from top of list. */ /* Get next op (if any) from top of list. */
spin_lock(&orangefs_request_list_lock); spin_lock(&orangefs_request_list_lock);
......
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