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| author | Zhou Zhengping <johnzzpcrystal@gmail.com> | 2017-04-28 11:43:04 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-05-09 03:36:06 +0200 |
| commit | 4ff7adc8c7886bcf6e48f09c49d3f339f33d7e79 (patch) | |
| tree | f2287f69678dbc37774249b4a6474bf7b96d1d3e /drivers/scsi | |
| parent | scsi: lpfc: Fix panic on BFS configuration (diff) | |
| download | linux-4ff7adc8c7886bcf6e48f09c49d3f339f33d7e79.tar.xz linux-4ff7adc8c7886bcf6e48f09c49d3f339f33d7e79.zip | |
scsi: Skip deleted devices in __scsi_device_lookup
When a device is unplugged from a SCSI controller, if the scsi_device is
still in use by application layer, it won't get released until users
close it.
In this case, scsi_device_remove just set the scsi_device's state to be
SDEV_DEL. But if you plug the disk just before the old scsi_device is
released, then there will be two scsi_device structures in
scsi_host->__devices. When the next unplug event happens, some low-level
drivers will check whether the scsi_device has been added to host (for
example the MegaRAID SAS series controller) by calling
scsi_device_lookup(call __scsi_device_lookup) in function
megasas_aen_polling. __scsi_device_lookup will return the first
scsi_device. Because its state is SDEV_DEL, the scsi_device_lookup will
return NULL, making the low-level driver assume that the scsi_device has
been removed, and won't call scsi_device_remove which will lead to hot
swap failure.
Signed-off-by: Zhou Zhengping <johnzzpcrystal@gmail.com>
Tested-by: Zeng Rujia <ZengRujia@sangfor.com.cn>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195607
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 7bfbcfa7af40..61cdd99ae41e 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -763,6 +763,8 @@ struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, struct scsi_device *sdev; list_for_each_entry(sdev, &shost->__devices, siblings) { + if (sdev->sdev_state == SDEV_DEL) + continue; if (sdev->channel == channel && sdev->id == id && sdev->lun ==lun) return sdev; |