On Sun, 2015-04-26 at 16:57 +0200, Ondrej Zary wrote:
> On Friday 24 April 2015 13:18:38 Hannes Reinecke wrote:
> > Ancient, and pretty much obsolete by now.
> >
> > Signed-off-by: Hannes Reinecke <h...@suse.de>
> > ---
> > drivers/scsi/advansys.c | 18 ------------------
> > 1 file changed, 18 deletions(-)
> >
> > diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
> > index 74e5518..5a55272 100644
> > --- a/drivers/scsi/advansys.c
> > +++ b/drivers/scsi/advansys.c
> > @@ -11212,24 +11212,6 @@ static int advansys_board_found(struct Scsi_Host
> > *shost, unsigned int iop, }
> >
> > /*
> > - * Following v1.3.89, 'cmd_per_lun' is no longer needed
> > - * and should be set to zero.
> > - *
> > - * But because of a bug introduced in v1.3.89 if the driver is
> > - * compiled as a module and 'cmd_per_lun' is zero, the Mid-Level
> > - * SCSI function 'allocate_device' will panic. To allow the driver
> > - * to work as a module in these kernels set 'cmd_per_lun' to 1.
> > - *
> > - * Note: This is wrong. cmd_per_lun should be set to the depth
> > - * you want on untagged devices always.
> > - #ifdef MODULE
> > - */
> > - shost->cmd_per_lun = 1;
> > -/* #else
> > - shost->cmd_per_lun = 0;
> > -#endif */
> > -
> > - /*
> > * Set the maximum number of scatter-gather elements the
> > * adapter can handle.
> > */
>
> This patch breaks my setup: "modprobe advansys" hangs.
>
> It works when all other patches are applied except this one.
The specific problem is that a cmd_per_lun of zero breaks everything
because we use it for the initial queue depth and if you don't actually
set it, you get zero (because the template is in static memory). This
should be a global fix that changes the default initial queue depth to 1
for the probe phase if it's unset in the template or the host.
Hopefully this should set us up for removing cmd_per_lun.
James
---
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 60aae01..681a59a 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -280,7 +280,8 @@ static struct scsi_device *scsi_alloc_sdev(struct
scsi_target *starget,
sdev->host->cmd_per_lun, shost->bqt,
shost->hostt->tag_alloc_policy);
}
- scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun);
+ scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun ?
+ sdev->host->cmd_per_lun : 1);
scsi_sysfs_device_initialize(sdev);
--
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