AuxXxilium/linux_dsm_epyc7002
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a9b54bb951
linux_dsm_epyc7002/drivers/block
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Bob Liu a9b54bb951 drivers: xen-blkfront: only talk_to_blkback() when in XenbusStateInitialising 
Patch 69b91ede5c
"drivers: xen-blkback: delay pending_req allocation to connect_ring"
exposed an problem that Xen blkfront has. There is a race
with XenStored and the drivers such that we can see two:

vbd vbd-268440320: blkfront:blkback_changed to state 2.
vbd vbd-268440320: blkfront:blkback_changed to state 2.
vbd vbd-268440320: blkfront:blkback_changed to state 4.

state changes to XenbusStateInitWait ('2'). The end result is that
blkback_changed() receives two notify and calls twice setup_blkring().

While the backend driver may only get the first setup_blkring() which is
wrong and reads out-dated (or reads them as they are being updated
with new ring-ref values).

The end result is that the ring ends up being incorrectly set.

The other drivers in the tree have such checks already in.

Reported-and-Tested-by: Robert Butera <robert.butera@oracle.com>
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2015-06-22 10:06:29 -04:00
..
aoe block: remove artifical max_hw_sectors cap 2014-10-21 14:02:54 -06:00
drbd Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-26 17:22:07 -07:00
mtip32xx blk-mq: add a 'list' parameter to ->queue_rq() 2014-10-29 11:14:52 -06:00
paride block: rename REQ_TYPE_SPECIAL to REQ_TYPE_DRV_PRIV 2015-05-05 13:40:03 -06:00
rsxx block/rsxx: use generic io stats accounting functions to simplify io stat accounting 2014-11-24 08:05:18 -07:00
xen-blkback xen/block: add multi-page ring support 2015-06-05 21:14:05 -04:00
zram zram: fix error return code 2015-04-15 16:35:22 -07:00
amiflop.c block: drop owner assignment from platform_drivers 2014-10-20 16:20:18 +02:00
ataflop.c Merge branch 'for-3.16/core' of git://git.kernel.dk/linux-block into next 2014-06-02 09:29:34 -07:00
brd.c brd: rename XIP to DAX 2015-02-16 17:56:04 -08:00
cciss_cmd.h cciss: use new doorbell-bit-5 reset method 2011-05-06 08:23:55 -06:00
cciss_scsi.c cciss: switch to ->show_info() 2013-04-09 14:13:19 -04:00
cciss_scsi.h cciss: add cciss_tape_cmds module paramter 2011-05-06 08:23:59 -06:00
cciss.c cciss: correct the non-resettable board list 2015-05-18 15:27:31 -06:00
cciss.h cciss: Adds simple mode functionality 2011-08-08 11:40:15 +02:00
cpqarray.c genirq: Remove the deprecated 'IRQF_DISABLED' request_irq() flag entirely 2015-03-05 20:53:06 +01:00
cpqarray.h
cryptoloop.c move linux/loop.h to drivers/block 2013-06-29 12:46:45 +04:00
DAC960.c block: use pci_zalloc_consistent 2014-08-08 15:57:28 -07:00
DAC960.h
floppy.c floppy: Avoid manual call of device_create_file() 2015-02-03 13:00:36 +01:00
hd.c block: hd: remove deprecated IRQF_DISABLED 2014-10-01 08:16:07 -06:00
ida_cmd.h
ida_ioctl.h
Kconfig drivers/block/pmem: Add a driver for persistent memory 2015-04-01 17:03:56 +02:00
loop.c loop: remove (now) unused 'out' label 2015-05-20 09:54:35 -06:00
loop.h block: loop: don't hold lo_ctl_mutex in lo_open 2015-05-20 09:06:09 -06:00
Makefile drivers/block/pmem: Add a driver for persistent memory 2015-04-01 17:03:56 +02:00
mg_disk.c block: drop owner assignment from platform_drivers 2014-10-20 16:20:18 +02:00
nbd.c block: nbd: convert to blkdev_reread_part() 2015-05-20 09:06:13 -06:00
null_blk.c null_blk: restart request processing on completion handler 2015-06-01 20:09:05 -06:00
nvme-core.c NVMe: Automatic namespace rescan 2015-06-05 10:58:34 -06:00
nvme-scsi.c nvme: submit internal commands through the block layer 2015-05-22 08:37:20 -06:00
osdblk.c block: support different tag allocation policy 2015-01-23 14:15:46 -07:00
pktcdvd.c block,scsi: fixup blk_get_request dead queue scenarios 2014-08-28 10:03:46 -06:00
pmem.c drivers/block/pmem: Fix 32-bit build warning in pmem_alloc() 2015-04-01 17:03:57 +02:00
ps3disk.c block: Kill bio_segments()/bi_vcnt usage 2013-11-23 22:33:51 -08:00
ps3vram.c block: Convert bio_for_each_segment() to bvec_iter 2013-11-23 22:33:49 -08:00
rbd_types.h rbd: get rid of RBD_MAX_SEG_NAME_LEN 2012-12-17 08:37:29 -06:00
rbd.c rbd: end I/O the entire obj_request on error 2015-05-01 16:44:30 -07:00
skd_main.c block: disable entropy contributions for nonrot devices 2014-10-04 10:55:32 -06:00
skd_s1120.h skd: fix formatting in skd_s1120.h 2013-11-08 09:10:30 -07:00
smart1,2.h fix typos 'comamnd' -> 'command' in comments 2011-02-02 11:31:21 +01:00
sunvdc.c sunvdc: reconnect ldc after vds service domain restarts 2014-12-11 18:52:45 -08:00
swim3.c powerpc: Move Power Macintosh drivers to generic byteswappers 2015-03-23 14:29:40 +11:00
swim_asm.S
swim.c block: drop owner assignment from platform_drivers 2014-10-20 16:20:18 +02:00
sx8.c block: rename REQ_TYPE_SPECIAL to REQ_TYPE_DRV_PRIV 2015-05-05 13:40:03 -06:00
umem.c block: Convert drivers to immutable biovecs 2013-11-23 22:33:51 -08:00
umem.h
virtio_blk.c block: rename REQ_TYPE_SPECIAL to REQ_TYPE_DRV_PRIV 2015-05-05 13:40:03 -06:00
xen-blkfront.c drivers: xen-blkfront: only talk_to_blkback() when in XenbusStateInitialising 2015-06-22 10:06:29 -04:00
xsysace.c block: systemace: Remove .owner field for driver 2014-08-21 20:37:54 -05:00
z2ram.c block: remove struct request buffer member 2014-04-15 14:03:02 -06:00