Hello, Desmond Cheong Zhi Xi <desmondcheongzx@xxxxxxxxx> wrote on Mon, 12 Jul 2021 16:29:16 +0800: > On 12/7/21 1:27 pm, Christoph Hellwig wrote: > > On Sat, Jul 10, 2021 at 09:16:38PM +0800, Hillf Danton wrote: > >> To break the lock chain, un/register blkdev without mtd_table_mutex held. > > > > Yes, Desmond Cheong Zhi Xi sent pretty much the same patch on June 18th > > (mtd: break circular locks in register_mtd_blktrans), but it did not get > > picked up. > > > > I believe Miquèl was waiting for -rc1 to apply it. Indeed, I already applied it but did not advertise yet. > > But taking a closer look, although the fix for the register path is the same, Hillf Danton's proposed patch additionally avoids inverting the lock hierarchy on the unregister path. So I believe this new patch should be more robust. We can definitely do this in two steps if you want. Thanks, Miquèl
