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Bodo Stroesser a45cb361ce scsi: target: tcmu: Fix crash in tcmu_flush_dcache_range on ARM 
[ Upstream commit 3145550a7f8b08356c8ff29feaa6c56aca12901d ]

This patch fixes the following crash (see
https://bugzilla.kernel.org/show_bug.cgi?id=208045)

 Process iscsi_trx (pid: 7496, stack limit = 0x0000000010dd111a)
 CPU: 0 PID: 7496 Comm: iscsi_trx Not tainted 4.19.118-0419118-generic
        #202004230533
 Hardware name: Greatwall QingTian DF720/F601, BIOS 601FBE20 Sep 26 2019
 pstate: 80400005 (Nzcv daif +PAN -UAO)
 pc : flush_dcache_page+0x18/0x40
 lr : is_ring_space_avail+0x68/0x2f8 [target_core_user]
 sp : ffff000015123a80
 x29: ffff000015123a80 x28: 0000000000000000
 x27: 0000000000001000 x26: ffff000023ea5000
 x25: ffffcfa25bbe08b8 x24: 0000000000000078
 x23: ffff7e0000000000 x22: ffff000023ea5001
 x21: ffffcfa24b79c000 x20: 0000000000000fff
 x19: ffff7e00008fa940 x18: 0000000000000000
 x17: 0000000000000000 x16: ffff2d047e709138
 x15: 0000000000000000 x14: 0000000000000000
 x13: 0000000000000000 x12: ffff2d047fbd0a40
 x11: 0000000000000000 x10: 0000000000000030
 x9 : 0000000000000000 x8 : ffffc9a254820a00
 x7 : 00000000000013b0 x6 : 000000000000003f
 x5 : 0000000000000040 x4 : ffffcfa25bbe08e8
 x3 : 0000000000001000 x2 : 0000000000000078
 x1 : ffffcfa25bbe08b8 x0 : ffff2d040bc88a18
 Call trace:
  flush_dcache_page+0x18/0x40
  is_ring_space_avail+0x68/0x2f8 [target_core_user]
  queue_cmd_ring+0x1f8/0x680 [target_core_user]
  tcmu_queue_cmd+0xe4/0x158 [target_core_user]
  __target_execute_cmd+0x30/0xf0 [target_core_mod]
  target_execute_cmd+0x294/0x390 [target_core_mod]
  transport_generic_new_cmd+0x1e8/0x358 [target_core_mod]
  transport_handle_cdb_direct+0x50/0xb0 [target_core_mod]
  iscsit_execute_cmd+0x2b4/0x350 [iscsi_target_mod]
  iscsit_sequence_cmd+0xd8/0x1d8 [iscsi_target_mod]
  iscsit_process_scsi_cmd+0xac/0xf8 [iscsi_target_mod]
  iscsit_get_rx_pdu+0x404/0xd00 [iscsi_target_mod]
  iscsi_target_rx_thread+0xb8/0x130 [iscsi_target_mod]
  kthread+0x130/0x138
  ret_from_fork+0x10/0x18
 Code: f9000bf3 aa0003f3 aa1e03e0 d503201f (f9400260)
 ---[ end trace 1e451c73f4266776 ]---

The solution is based on patch:

  "scsi: target: tcmu: Optimize use of flush_dcache_page"

which restricts the use of tcmu_flush_dcache_range() to addresses from
vmalloc'ed areas only.

This patch now replaces the virt_to_page() call in
tcmu_flush_dcache_range() - which is wrong for vmalloced addrs - by
vmalloc_to_page().

The patch was tested on ARM with kernel 4.19.118 and 5.7.2

Link: https://lore.kernel.org/r/20200618131632.32748-3-bstroesser@ts.fujitsu.com
Tested-by: JiangYu <lnsyyj@hotmail.com>
Tested-by: Daniel Meyerholt <dxm523@gmail.com>
Acked-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-03-16 16:34:31 +08:00
..
iscsi scsi: target: fix hang when multiple threads try to destroy the same iscsi session 2021-03-16 16:26:27 +08:00
loopback scsi: target: loopback: Fix READ with data and sensebytes 2021-03-16 16:30:15 +08:00
sbp Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tcm_fc Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Makefile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_alua.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_alua.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_configfs.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_device.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_fabric_configfs.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_fabric_lib.c scsi: target: fix PR IN / READ FULL STATUS for FC 2021-03-16 16:27:13 +08:00
target_core_file.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_file.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_hba.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_iblock.c scsi: target/iblock: fix WRITE SAME zeroing 2021-03-16 16:27:23 +08:00
target_core_iblock.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_internal.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_pr.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_pr.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_pscsi.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_pscsi.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_rd.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_rd.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_sbc.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_spc.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_stat.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_tmr.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_tpg.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_transport.c scsi: target: Put lun_ref at end of tmr processing 2021-03-16 16:28:15 +08:00
target_core_ua.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_ua.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_user.c scsi: target: tcmu: Fix crash in tcmu_flush_dcache_range on ARM 2021-03-16 16:34:31 +08:00
target_core_xcopy.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
target_core_xcopy.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00