On 11/06/2014 10:11 PM, wenxiong@xxxxxxxxxxxxxxxxxx wrote: > Multipath devices using the TUR path checker need to see the sense > code for a failed TUR command in their device handler. Since commit > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ > drivers/scsi/scsi_error.c?id=14216561e164671ce147458653b1fea06a > we always return success for mid layer issued TUR commands before > calling the device handler, which stopped the TUR path checker from working. > > Move the call to the device handler check sense method before the early > return for TUR commands to give the device handler a chance to intercept > them. > > Signed-off-by: Christoph Hellwig <hch@xxxxxxxxxxxxx> > Tested-by: Wen Xiong <wenxiong@xxxxxxxxxxxxxxxxxx> > --- > drivers/scsi/scsi_error.c | 16 ++++++++-------- > 1 file changed, 8 insertions(+), 8 deletions(-) > > Index: b/drivers/scsi/scsi_error.c > =================================================================== > --- a/drivers/scsi/scsi_error.c 2014-10-23 12:54:16.000000000 -0500 > +++ b/drivers/scsi/scsi_error.c 2014-10-23 12:57:44.642078988 -0500 > @@ -459,14 +459,6 @@ static int scsi_check_sense(struct scsi_ > if (! scsi_command_normalize_sense(scmd, &sshdr)) > return FAILED; /* no valid sense data */ > > - if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) > - /* > - * nasty: for mid-layer issued TURs, we need to return the > - * actual sense data without any recovery attempt. For eh > - * issued ones, we need to try to recover and interpret > - */ > - return SUCCESS; > - > scsi_report_sense(sdev, &sshdr); > > if (scsi_sense_is_deferred(&sshdr)) > @@ -482,6 +474,14 @@ static int scsi_check_sense(struct scsi_ > /* handler does not care. Drop down to default handling */ > } > > + if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) > + /* > + * nasty: for mid-layer issued TURs, we need to return the > + * actual sense data without any recovery attempt. For eh > + * issued ones, we need to try to recover and interpret > + */ > + return SUCCESS; > + > /* > * Previous logic looked for FILEMARK, EOM or ILI which are > * mainly associated with tapes and returned SUCCESS. > Reviewed-by: Hannes Reinecke <hare@xxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: J. Hawn, J. Guild, F. Imendörffer, HRB 21284 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
