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block: don't take lock on changing ra_pages

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There's no need to take queue_lock or kernel_lock when modifying
bdi->ra_pages. So remove them. Also remove out of date comment for
queue_max_sectors_store().

Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Wu Fengguang
2008-11-25 09:08:39 +01:00
committed by Jens Axboe
parent 4236469099
commit 7c239517d9
3 changed files with 1 additions and 10 deletions
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2
block/compat_ioctl.c
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@@ -774,9 +774,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
bdi = blk_get_backing_dev_info(bdev);
if (bdi == NULL)
return -ENOTTY;
lock_kernel();
bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
unlock_kernel();
return 0;
case BLKGETSIZE:
size = bdev->bd_inode->i_size;