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scsi: ipr: System hung while dlpar adding primary ipr adapter back

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While dlpar adding primary ipr adapter back, driver goes through adapter
initialization then schedule ipr_worker_thread to start te disk scan by
dropping the host lock, calling scsi_add_device.  Then get the adapter reset
request again, so driver does scsi_block_requests, this will cause the
scsi_add_device get hung until we unblock. But we can't run ipr_worker_thread
to do the unblock because its stuck in scsi_add_device.

This patch fixes the issue.

[mkp: typo and whitespace fixes]

Signed-off-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Wen Xiong
2018-09-20 19:32:12 -05:00
committed by Martin K. Petersen
parent 8c39e2699f
commit 318ddb34b2
2 changed files with 64 additions and 47 deletions
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1
drivers/scsi/ipr.h
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@@ -1575,6 +1575,7 @@ struct ipr_ioa_cfg {
u8 saved_mode_page_len;
struct work_struct work_q;
struct work_struct scsi_add_work_q;
struct workqueue_struct *reset_work_q;
wait_queue_head_t reset_wait_q;