]> git.karo-electronics.de Git - linux-beck.git/commit
[SCSI] fix hot unplug vs async scan race
authorDan Williams <dan.j.williams@intel.com>
Fri, 22 Jun 2012 06:47:28 +0000 (23:47 -0700)
committerJames Bottomley <JBottomley@Parallels.com>
Fri, 20 Jul 2012 07:58:45 +0000 (08:58 +0100)
commit3b661a92e869ebe2358de8f4b3230ad84f7fce51
treeaec30c8a07dacb470e0ca90082d34651b5ba4c1c
parentb5f1758f221e446c5a2956cf7ffdf62b005f6458
[SCSI] fix hot unplug vs async scan race

The following crash results from cases where the end_device has been
removed before scsi_sysfs_add_sdev has had a chance to run.

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000098
 IP: [<ffffffff8115e100>] sysfs_create_dir+0x32/0xb6
 ...
 Call Trace:
  [<ffffffff8125e4a8>] kobject_add_internal+0x120/0x1e3
  [<ffffffff81075149>] ? trace_hardirqs_on+0xd/0xf
  [<ffffffff8125e641>] kobject_add_varg+0x41/0x50
  [<ffffffff8125e70b>] kobject_add+0x64/0x66
  [<ffffffff8131122b>] device_add+0x12d/0x63a
  [<ffffffff814b65ea>] ? _raw_spin_unlock_irqrestore+0x47/0x56
  [<ffffffff8107de15>] ? module_refcount+0x89/0xa0
  [<ffffffff8132f348>] scsi_sysfs_add_sdev+0x4e/0x28a
  [<ffffffff8132dcbb>] do_scan_async+0x9c/0x145

...teach scsi_sysfs_add_devices() to check for deleted devices() before
trying to add them, and teach scsi_remove_target() how to remove targets
that have not been added via device_add().

Cc: <stable@vger.kernel.org>
Reported-by: Dariusz Majchrzak <dariusz.majchrzak@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
drivers/scsi/scsi_scan.c
drivers/scsi/scsi_sysfs.c