On Mar 21, 2023 / 17:23, Keith Busch wrote: > From: Keith Busch <kbusch@xxxxxxxxxx> > > Polling needs a bio with a valid bi_bdev, but neither of those are > guaranteed for polled driver requests. Make request based polling use > directly use blk-mq's polling function. > > When executing a request from a polled hctx, we know the request's > cookie, and that it's from a live multi-queue that supports polling, so > we can safely skip everything that bio_poll provides. > > Link: http://lists.infradead.org/pipermail/linux-nvme/2023-March/038340.html > Reported-by: Martin Belanger <Martin.Belanger@xxxxxxxx> > Reported-by: Daniel Wagner <dwagner@xxxxxxx> > Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx> I also tested this patch with rdma and tcp transports using the blktests patches by Daniel [1]. It fixes the failure, and I did not observe test hangs. Good. Tested-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx> I suggest to add the "Cc: stable@xxxxxxxxxx" tag also. Without this fix patch, the new blktests test case causes test process hang or test system hang on stable kernel versions 6.1.0 and 6.2.0. I confirmed the fix patch avoids the hangs on those stable kernel versions (This patch can not be applied the kernel to v5.15.105 due to conflicts). [1] https://lore.kernel.org/linux-block/20230329090202.8351-1-dwagner@xxxxxxx/ -- Shin'ichiro Kawasaki
