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Date: Fri, 19 Jun 2015 11:05:48 -0400 From: "Martin K. Petersen" <martin.petersen@...cle.com> To: Sreekanth Reddy <sreekanth.reddy@...gotech.com> Cc: jejb@...nel.org, hch@...radead.org, martin.petersen@...cle.com, linux-scsi@...r.kernel.org, JBottomley@...allels.com, Sathya.Prakash@...gotech.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH 03/20] [SCSI] mpt3sas: Don't block the drive when drive addition under the control of SML > During hot-plugging of a disk(having a flaky link), the disk addition > stops and any further disk addition or removal doesn't happen on that > controller. > This is because, when driver receives DELAY_NOT_RESPONDING event for > a disk while it is undergoing addition at the SCSI Transport layer, > the driver would block the I/O to that disk resulting in a > deadlock. i.e the disk addition work couldn't be completed at the > SCSI Transport Layer as it can't send any I/Os (such as Inquiry, > Report LUNs etc) to the disk as I/Os are blocked to this drive. Also > any subsequent device removal (TARGET_NOT_RESPONDING) or link > update(RC_PHY_CHANGED) event couldn't be processed as they are in the > queue to get processed after disk addition event. Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com> -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/
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