From: Steffen Maier Date: Fri, 28 Jul 2017 10:30:51 +0000 (+0200) Subject: scsi: zfcp: fix queuecommand for scsi_eh commands when DIX enabled X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=71b8e45da51a7b64a23378221c0a5868bd79da4f;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git scsi: zfcp: fix queuecommand for scsi_eh commands when DIX enabled Since commit db007fc5e20c ("[SCSI] Command protection operation"), scsi_eh_prep_cmnd() saves scmd->prot_op and temporarily resets it to SCSI_PROT_NORMAL. Other FCP LLDDs such as qla2xxx and lpfc shield their queuecommand() to only access any of scsi_prot_sg...() if (scsi_get_prot_op(cmd) != SCSI_PROT_NORMAL). Do the same thing for zfcp, which introduced DIX support with commit ef3eb71d8ba4 ("[SCSI] zfcp: Introduce experimental support for DIF/DIX"). Otherwise, TUR SCSI commands as part of scsi_eh likely fail in zfcp, because the regular SCSI command with DIX protection data, that scsi_eh re-uses in scsi_send_eh_cmnd(), of course still has (scsi_prot_sg_count() != 0) and so zfcp sends down bogus requests to the FCP channel hardware. This causes scsi_eh_test_devices() to have (finish_cmds == 0) [not SCSI device is online or not scsi_eh_tur() failed] so regular SCSI commands, that caused / were affected by scsi_eh, are moved to work_q and scsi_eh_test_devices() itself returns false. In turn, it unnecessarily escalates in our case in scsi_eh_ready_devs() beyond host reset to finally scsi_eh_offline_sdevs() which sets affected SCSI devices offline with the following kernel message: "kernel: sd H:0:T:L: Device offlined - not ready after error recovery" Signed-off-by: Steffen Maier Fixes: ef3eb71d8ba4 ("[SCSI] zfcp: Introduce experimental support for DIF/DIX") Cc: #2.6.36+ Reviewed-by: Benjamin Block Signed-off-by: Benjamin Block Signed-off-by: Martin K. Petersen --- diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c index 3b69ec5e69ed..e894ec92076c 100644 --- a/drivers/s390/scsi/zfcp_fsf.c +++ b/drivers/s390/scsi/zfcp_fsf.c @@ -2257,7 +2257,8 @@ int zfcp_fsf_fcp_cmnd(struct scsi_cmnd *scsi_cmnd) fcp_cmnd = (struct fcp_cmnd *) &req->qtcb->bottom.io.fcp_cmnd; zfcp_fc_scsi_to_fcp(fcp_cmnd, scsi_cmnd, 0); - if (scsi_prot_sg_count(scsi_cmnd)) { + if ((scsi_get_prot_op(scsi_cmnd) != SCSI_PROT_NORMAL) && + scsi_prot_sg_count(scsi_cmnd)) { zfcp_qdio_set_data_div(qdio, &req->qdio_req, scsi_prot_sg_count(scsi_cmnd)); retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,