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orangefs: return from orangefs_devreq_read quickly if possible

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It is not necessary to take the lock and search through the request list
if the list is empty.

Signed-off-by: Martin Brandenburg <[email protected]>
Signed-off-by: Mike Marshall <[email protected]>
This commit is contained in:
Martin Brandenburg 2017-04-25 15:38:06 -04:00 • committed by Mike Marshall
commit b7a57ccab8
1 changed files with 4 additions and 0 deletions
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4
fs/orangefs/devorangefs-req.c
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@ -180,6 +180,10 @@ static ssize_t orangefs_devreq_read(struct file *file,
return -EINVAL;
}
/* Check for an empty list before locking. */
if (list_empty(&orangefs_request_list))
return -EAGAIN;
restart:
/* Get next op (if any) from top of list. */
spin_lock(&orangefs_request_list_lock);