On Fri, Dec 27, 2019 at 07:50:34PM +0100, Klemens Nanni wrote:
> Diff below is what I booted last, but for reasons yet unkown to me the
> kernel just hangs afer debug printf()
>
> ...
> mpii0 at pci15 dev 0 function 0 "Symbios Logic SAS2008" rev 0x03: msi
> mpii0: Solana On-Board, firmware 9.0.0.0 IR, MPI 2.0
> scsibus1 at mpii0: 834 targets
> mpii_scsi_probe: target 0 lun 0 port_wwn 0 node_wwn 0 has
> MPII_DF_VOLUME set in flags 10
More specifically, the driver hangs here:
2839 void
2840 mpii_wait(struct mpii_softc *sc, struct mpii_ccb *ccb)
2841 {
2842 struct mutex mtx = MUTEX_INITIALIZER(IPL_BIO);
2843 void (*done)(struct mpii_ccb *);
2844 void *cookie;
2845
2846 done = ccb->ccb_done;
2847 cookie = ccb->ccb_cookie;
2848
2849 ccb->ccb_done = mpii_wait_done;
2850 ccb->ccb_cookie = &mtx;
2851
2852 /* XXX this will wait forever for the ccb to complete */
2853
2854 mpii_start(sc, ccb);
2855
2856 mtx_enter(&mtx);
2857 while (ccb->ccb_cookie != NULL)
2858 msleep(ccb, &mtx, PRIBIO, "mpiiwait", 0);
2859 mtx_leave(&mtx);
2860
2861 ccb->ccb_cookie = cookie;
2862 done(ccb);
2863 }
mpii_start() returns then mpii_wait() "wait[s] forever". I'm still
practically lost in this area.
Why does it hang there only if I fetch the `struct mpii_cfg_raid_vol_pg1'
page for its wwid member in mpii_scsi_probe() as per the previous diff?
The commit which introduced the XXX:
revision 1.31
date: 2010/07/07 10:29:17; author: dlg; state: Exp; lines: +52 -34;
bring mpi_wait over to mpii for an mpsafe mechanism to sleep while
waiting
for a command to complete. this also replaces all the while (!ready) \
tsleep() wrapped in splbio code with mpii_wait.
tested with bioctl runs and sensor updates on a raid volume
