1. 04 6月, 2005 2 次提交
    • J
      [SCSI] fix aic7xxx coupled parameter problem · 597487b9
      James Bottomley 提交于
      For setting coupled parameters, we need to be comparing against the goal
      settings, not the current ones.
      Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
      597487b9
    • B
      [SCSI] sg: Command completion after remove oops · 521314c1
      brking@us.ibm.com 提交于
      A problem exists todayin the sg driver that if an SG_IO request is
      outstanding to a device when it is removed from the system. The
      system may oops if that command completes later in time.
      
      1. sg_remove gets called
      2. sg_remove calls sg_finish_req_req on all pending requests
         This removes the Sg_request's from the headrp list in the Sg_fd
      3. The sleeping SG_IO ioctl is woken. It does nothing and returns.
      4. The caller closes the fd, which invokes sg_release
      5. sg_release calls sg_remove_sfp. It finds no outstanding commands
         since the headrp list is empty, so it calls __sg_remove_sfp,
         which frees the sfp.
      6. Now when sg_cmd_done gets called, sg uses upper_private_data in
         the Scsi_Request, which should point to the srp, which has been
         freed, so it points to freed memory.
      7. sg then dereferences the srp pointer to get the sfp, and we oops.
      
      The fix is to NULL out the upper_private_data field in this path,
      which sg_cmd_done already checks for, which will prevent the oops
      from occurring.
      
      cpu 0x1: Vector: 300 (Data Access) at [c00000000fff7aa0]
          pc: d0000000002bbea8: .sg_cmd_done+0x70/0x394 [sg]
          lr: d000000000073304: .scsi_finish_command+0x10c/0x130 [scsi_mod]
          sp: c00000000fff7d20
         msr: 8000000000009032
         dar: 2f70726f63202f78
       dsisr: 40000000
        current = 0xc0000000024589b0
        paca    = 0xc0000000003da800
          pid   = 7, comm = events/1
      [c00000000fff7dc0] d000000000073304 .scsi_finish_command+0x10c/0x130 [scsi_mod]
      [c00000000fff7e50] d00000000007317c .scsi_softirq+0x140/0x168 [scsi_mod]
      [c00000000fff7ef0] c0000000000634dc .__do_softirq+0xa0/0x17c
      [c00000000fff7f90] c000000000018430 .call_do_softirq+0x14/0x24
      [c00000000ed472e0] c0000000000142e0 .do_softirq+0x74/0x9c
      [c00000000ed47370] c000000000013c9c .do_IRQ+0xe8/0x100
      [c00000000ed473f0] c00000000000ae34 HardwareInterrupt_entry+0x8/0x54
      
      c00000000003df28 .smp_call_function+0
      x100/0x1d0
      [c00000000ed47780] c0000000000ba99c .invalidate_bh_lrus+0x30/0x70
      [c00000000ed47810] c0000000000b91a0 .invalidate_bdev+0x18/0x3c
      [c00000000ed478a0] c0000000000da7b8 .__invalidate_device+0x70/0x94
      [c00000000ed47930] c0000000001d40bc .invalidate_partition+0x4c/0x7c
      [c00000000ed479c0] c00000000010a944 .del_gendisk+0x48/0x15c
      [c00000000ed47a50] d00000000003d55c .sd_remove+0x34/0xe4 [sd_mod]
      [c00000000ed47ae0] c0000000001c5d30 .device_release_driver+0x90/0xb4
      [c00000000ed47b70] c0000000001c6130 .bus_remove_device+0xb0/0x12c
      [c00000000ed47c00] c0000000001c4378 .device_del+0x120/0x198
      [c00000000ed47ca0] d00000000007dcdc .scsi_remove_device+0xb4/0x194 [scsi_mod]
      [c00000000ed47d30] d0000000000a5864 .ipr_worker_thread+0x1d4/0x27c [ipr]
      [c00000000ed47dd0] c0000000000734c4 .worker_thread+0x238/0x2f4
      [c00000000ed47ee0] c0000000000796c0 .kthread+0xcc/0x11c
      [c00000000ed47f90] c000000000018ad0 .kernel_thread+0x4c/0x6c
      Signed-off-by: NBrian King <brking@us.ibm.com>
      Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
      521314c1
  2. 27 5月, 2005 3 次提交
  3. 26 5月, 2005 33 次提交
  4. 25 5月, 2005 2 次提交