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[SCSI] libfc: fixed a read IO data integrity issue when a IO data frame lost 

The fc_fcp_complete_locked detected data underrun in this case and set
the FC_DATA_UNDRUN but that was ignored by fc_io_compl for all cases
including read underrun.

Added code to not to ignore FC_DATA_UNDRUN for read IO and instead
suggested scsi-ml to retry cmd to  recover from lost data frame.

Not sure if it is okay to ignore FC_DATA_UNDRUN for other case, so let
code as is for other cases but removed or-ing with zero valued fsp->cdb_status
for those cases.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Vasu Dev 2009-02-27 10:55:07 -08:00 committed by James Bottomley
parent 6755db1cd4
commit 26d9cab558
1 changed files with 3 additions and 3 deletions
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6
drivers/scsi/libfc/fc_fcp.c
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@ -1810,12 +1810,12 @@ static void fc_io_compl(struct fc_fcp_pkt *fsp)
sc_cmd->result = DID_ERROR << 16;
break;
case FC_DATA_UNDRUN:
if (fsp->cdb_status == 0) {
if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
/*
* scsi status is good but transport level
* underrun. for read it should be an error??
* underrun.
*/
sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
sc_cmd->result = DID_OK << 16;
} else {
/*
* scsi got underrun, this is an error