Alan Stern d55d15a332 scsi: block: Do not accept any requests while suspended ... [ Upstream commit 52abca64fd ] blk_queue_enter() accepts BLK_MQ_REQ_PM requests independent of the runtime power management state. Now that SCSI domain validation no longer depends on this behavior, modify the behavior of blk_queue_enter() as follows: - Do not accept any requests while suspended. - Only process power management requests while suspending or resuming. Submitting BLK_MQ_REQ_PM requests to a device that is runtime suspended causes runtime-suspended devices not to resume as they should. The request which should cause a runtime resume instead gets issued directly, without resuming the device first. Of course the device can't handle it properly, the I/O fails, and the device remains suspended. The problem is fixed by checking that the queue's runtime-PM status isn't RPM_SUSPENDED before allowing a request to be issued, and queuing a runtime-resume request if it is. In particular, the inline blk_pm_request_resume() routine is renamed blk_pm_resume_queue() and the code is unified by merging the surrounding checks into the routine. If the queue isn't set up for runtime PM, or there currently is no restriction on allowed requests, the request is allowed. Likewise if the BLK_MQ_REQ_PM flag is set and the status isn't RPM_SUSPENDED. Otherwise a runtime resume is queued and the request is blocked until conditions are more suitable. [ bvanassche: modified commit message and removed Cc: stable because without the previous patches from this series this patch would break parallel SCSI domain validation + introduced queue_rpm_status() ] Link: https://lore.kernel.org/r/20201209052951.16136-9-bvanassche@acm.org Cc: Jens Axboe <axboe@kernel.dk> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Can Guo <cang@codeaurora.org> Cc: Stanley Chu <stanley.chu@mediatek.com> Cc: Ming Lei <ming.lei@redhat.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reported-and-tested-by: Martin Kepplinger <martin.kepplinger@puri.sm> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Can Guo <cang@codeaurora.org> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-01-12 20:18:17 +01:00
..
acpi	PM: ACPI: PCI: Drop acpi_pm_set_bridge_wakeup()	2020-12-30 11:54:05 +01:00
asm-generic	local64.h: make <asm/local64.h> mandatory	2021-01-12 20:18:16 +01:00
clocksource
crypto
drm	drm: drm_print.h: fix kernel-doc markups	2020-10-27 11:21:39 +01:00
dt-bindings
keys
kunit	kunit: fix display of failed expectations for strings	2020-11-10 13:45:15 -07:00
kvm
linux	scsi: block: Do not accept any requests while suspended	2021-01-12 20:18:17 +01:00
math-emu
media	media: v4l2-fwnode: v4l2_fwnode_endpoint_parse caller must init vep argument	2020-12-30 11:53:11 +01:00
memory
misc
net	net: sched: prevent invalid Scell_log shift count	2021-01-12 20:18:12 +01:00
pcmcia
ras
rdma	RDMA/core: remove use of dma_virt_ops	2021-01-09 13:46:24 +01:00
scsi	scsi: libiscsi: Fix NOP race condition	2020-11-16 22:32:50 -05:00
soc	net: mscc: ocelot: fix dropping of unknown IPv4 multicast on Seville	2020-12-05 15:41:34 -08:00
sound	ASoC: Fixes for v5.11	2020-11-19 19:56:29 +01:00
target
trace	trace: fix potenial dangerous pointer	2020-11-25 13:03:44 +01:00
uapi	uapi: move constants from <linux/kernel.h> to <linux/const.h>	2021-01-06 14:56:51 +01:00
vdso
video
xen	xen/xenbus: Count pending messages for each watch	2020-12-30 11:54:27 +01:00