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loop: Use pr_warn_once() for loop_control_remove() warning

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kernel test robot reported that RCU stall via printk() flooding is
possible [1] when stress testing.

Link: https://lkml.kernel.org/r/20211129073709.GA18483@xsang-OptiPlex-9020 [1]
Reported-by: kernel test robot <oliver.sang@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tetsuo Handa 2021-11-29 19:00:43 +09:00 committed by Jens Axboe
parent d422f40163
commit e3f9387aea
1 changed files with 1 additions and 1 deletions
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drivers/block/loop.c
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@ -2103,7 +2103,7 @@ static int loop_control_remove(int idx)
int ret;
if (idx < 0) {
pr_warn("deleting an unspecified loop device is not supported.\n");
pr_warn_once("deleting an unspecified loop device is not supported.\n");
return -EINVAL;
}