block: don't take lock on changing ra_pages
[linux-2.6.git] / block / blk-sysfs.c
index 21e275d..a29cb78 100644 (file)
@@ -88,9 +88,7 @@ queue_ra_store(struct request_queue *q, const char *page, size_t count)
        unsigned long ra_kb;
        ssize_t ret = queue_var_store(&ra_kb, page, count);
 
-       spin_lock_irq(q->queue_lock);
        q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10);
-       spin_unlock_irq(q->queue_lock);
 
        return ret;
 }
@@ -117,10 +115,7 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
 
        if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
                return -EINVAL;
-       /*
-        * Take the queue lock to update the readahead and max_sectors
-        * values synchronously:
-        */
+
        spin_lock_irq(q->queue_lock);
        q->max_sectors = max_sectors_kb << 1;
        spin_unlock_irq(q->queue_lock);