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5bfb2c3148
linux/drivers/s390/scsi
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Swen Schillig 5bfb2c3148 [SCSI] zfcp: Fix common FCP request reception 
The reception of a common FCP request should only be evaluated if the
corresponding SCSI request data is available. Therefore put the
information under the lock protection and verify the existence before
processing.  This fixes the following kernel panic.

Unable to handle kernel pointer dereference at virtual kernel address 0000000180000000
Oops: 003b [#1] PREEMPT SMP DEBUG_PAGEALLOC
CPU: 0 Not tainted 2.6.35.7-45.x.20101007-s390xdefault #1
Process blast (pid: 9711, task: 00000000a3be8e40, ksp: 00000000b221bac0)
Krnl PSW : 0704300180000000 0000000000489878 (zfcp_fsf_fcp_handler_common+0x4c/0x3a0)
           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:3 PM:0 EA:3
Krnl GPRS: 00000000b663c1b8 0000000180000000 000000007ab5bdf0 0000000000000000
           00000000b0ccd800 0000000000000018 07000000a3be8e78 00000000b5d3e600
           000000007ab5bdf0 0000000000000066 00000000b72137f0 00000000b72137f0
           0000000000000000 00000000005a8178 00000000bdf37a60 00000000bdf379f0
Krnl Code: 0000000000489866: e3c030000004       lg      %r12,0(%r3)
           000000000048986c: e310c0000004       lg      %r1,0(%r12)
           0000000000489872: e31011e00004       lg      %r1,480(%r1)
          >0000000000489878: 581011ec           l       %r1,492(%r1)
           000000000048987c: a774001c           brc     7,4898b4
           0000000000489880: b91400b1           lgfr    %r11,%r1
           0000000000489884: 5810405c           l       %r1,92(%r4)
           0000000000489888: 5510d00c           cl      %r1,12(%r13)
Call Trace:
([<000000000010d344>] debug_event_common+0x22c/0x244)
 [<000000000048a0b4>] zfcp_fsf_fcp_cmnd_handler+0x2c/0x3b4
 [<000000000048b5b6>] zfcp_fsf_req_complete+0x1b6/0x9dc
 [<000000000048bede>] zfcp_fsf_reqid_check+0x102/0x138
 [<000000000048e478>] zfcp_qdio_int_resp+0x70/0x110
 [<000000000044a1ec>] qdio_kick_handler+0xb0/0x19c
 [<000000000044c228>] __tiqdio_inbound_processing+0x30c/0xebc
 [<000000000014a5fc>] tasklet_action+0x1b4/0x1e8
 [<000000000014b676>] __do_softirq+0x106/0x1cc
 [<000000000010d91a>] do_softirq+0xe6/0xec
 [<000000000014b0c8>] irq_exit+0xd4/0xd8
 [<00000000004307ec>] do_IRQ+0x7c0/0xf54
 [<0000000000114d28>] io_return+0x0/0x16
 [<000000000055fef0>] sub_preempt_count+0x50/0xe4
([<00000000b1f873c0>] 0xb1f873c0)
 [<000000000055e25a>] _raw_spin_unlock+0x46/0x74
 [<0000000000241c40>] __d_lookup+0x288/0x2c8
 [<000000000023502c>] do_lookup+0x7c/0x25c
 [<0000000000237fa8>] link_path_walk+0x5e4/0xe2c
 [<0000000000238a00>] path_walk+0x98/0x148
 [<0000000000238c98>] do_path_lookup+0x74/0xc0
 [<000000000023989c>] user_path_at+0x64/0xa4
 [<000000000022e366>] vfs_fstatat+0x4e/0xb0
 [<000000000022e4d6>] SyS_newstat+0x2e/0x54
 [<00000000001146de>] sysc_noemu+0x10/0x16
 [<0000020000153456>] 0x20000153456
INFO: lockdep is turned off.
Last Breaking-Event-Address:
 [<000000000048a0ae>] zfcp_fsf_fcp_cmnd_handler+0x26/0x3b4

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-12-09 09:41:17 -06:00
..
Makefile [SCSI] zfcp: Move code for managing zfcp_unit devices to new file 2010-09-16 22:54:15 -04:00
zfcp_aux.c [SCSI] zfcp: Move code for managing zfcp_unit devices to new file 2010-09-16 22:54:15 -04:00
zfcp_ccw.c [SCSI] zfcp: Replace status modifier functions. 2010-09-16 22:54:23 -04:00
zfcp_cfdc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2010-10-22 17:34:15 -07:00
zfcp_dbf.c [SCSI] zfcp: Remove scsi_cmnd->serial_number from debug traces 2010-10-07 17:25:26 -05:00
zfcp_dbf.h [SCSI] zfcp: Remove scsi_cmnd->serial_number from debug traces 2010-10-07 17:25:26 -05:00
zfcp_def.h [SCSI] zfcp: Replace status modifier functions. 2010-09-16 22:54:23 -04:00
zfcp_erp.c [SCSI] zfcp: Replace status modifier functions. 2010-09-16 22:54:23 -04:00
zfcp_ext.h [SCSI] zfcp: Replace status modifier functions. 2010-09-16 22:54:23 -04:00
zfcp_fc.c [SCSI] zfcp: Replace status modifier functions. 2010-09-16 22:54:23 -04:00
zfcp_fc.h [SCSI] zfcp: Use correct length for FCP_RSP_INFO 2010-10-25 09:42:38 -05:00
zfcp_fsf.c [SCSI] zfcp: Fix common FCP request reception 2010-12-09 09:41:17 -06:00
zfcp_fsf.h [SCSI] zfcp: Introduce experimental support for DIF/DIX 2010-07-28 09:48:56 -05:00
zfcp_qdio.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2010-10-23 11:47:02 -07:00
zfcp_qdio.h [SCSI] zfcp: Introduce experimental support for DIF/DIX 2010-07-28 09:48:56 -05:00
zfcp_reqlist.h [SCSI] zfcp: Move FSF request tracking code to new file 2010-02-17 17:46:19 -06:00
zfcp_scsi.c SCSI host lock push-down 2010-11-16 13:33:23 -08:00
zfcp_sysfs.c [SCSI] zfcp: Replace status modifier functions. 2010-09-16 22:54:23 -04:00
zfcp_unit.c [SCSI] zfcp: Call get_device on port before calling put_device 2010-10-25 09:42:37 -05:00