iocost: don't nest spin_lock_irq in ioc_weight_write()
commit 41591a51f00d2dc7bb9dc6e9bedf56c5cf6f2392 upstream. This code causes a static analysis warning: block/blk-iocost.c:2113 ioc_weight_write() error: double lock 'irq' We disable IRQs in blkg_conf_prep() and re-enable them in blkg_conf_finish(). IRQ disable/enable should not be nested because that means the IRQs will be enabled at the first unlock instead of the second one. Fixes: 7caa47151ab2 ("blkcg: implement blk-iocost") Acked-by: NTejun Heo <tj@kernel.org> Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NJens Axboe <axboe@kernel.dk> Signed-off-by: NJiufei Xue <jiufei.xue@linux.alibaba.com> Reviewed-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
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