On Thu, 02 Aug 2007 14:26:47 +0300 Boaz Harrosh wrote:
> Randy Dunlap wrote:
> > On Wed, 01 Aug 2007 08:51:14 -0500 James Bottomley wrote:
> >
> >> On Tue, 2007-07-31 at 11:40 -0700, Randy Dunlap wrote:
> >>> On Tue, 31 Jul 2007 10:59:51 +0300 Boaz Harrosh wrote:
> >>>
> >>>> Randy Dunlap wrote:
> >>>>> Since you grok all of that (above), maybe you can help here:
> >>>>>
> >>>>> With these 6 patches applied, I do the following:
> >>>>>
> >>>>> 1. insert PCMCIA aha152x card with SCSI drive attached (/dev/sdb4)
> >>>>> 2. mount -t vfat /dev/sdb4 /mnt/disk
> >>>>> 3. play with /mnt/disk
> >>>>> 4. umount /mnt/disk
> >>>>>
> >>>>> Now I would like to rmmod the aha152x_cs module, but its use count
> >>>>> is 2. Even if I eject the card, its use count stays at 2.
> >>>>> Maybe the reset or check_condition patch doesn't clean up correctly,
> >>>>> or one of them isn't releasing a used resource ?
> >>>>>
> >>>>> (this is 2.6.23-rc1 + your 6 patches + 1 acpi seq-file throttling fix.)
> >>>>>
> >>>> I had an hard look and a very careful line-by-line compare
> >>>> and I can't find anything obvious. Could you do a bisect.
> >>>> maybe it will give me a clue as to where to look. Also please
> >>>> Enable debug prints. Maybe the driver is stuck at some state
> >>>> and does not exit.
> >>> The good news is that this problem has nothing to do with this
> >>> patch series. The bad news is that this problem is there anyway.
> I was afraid of that. I will try and see what other PCMCIA drivers
> are doing in this situation. It looks like the driver should bailout
> much earlier in the event that the card is not present. But it lets
> the request in anyway. The original driver was not written for hotplug
> PCMCIA maybe that's why.
Yes, Christoph would like to see the ISA & PCMCIA drivers as separate
drivers, using the correct driver models, and not using that ugly
#include .c source file trick.
> Please correct me if I'm wrong
> 1. pccard senses an eject coming and is doing device_unregister()
> 2. sd.c in sd_shutdown() is doing a Synchronize Cache.
> 3. The command is queued but since card is not there anymore an interrupt
> never
> comes and the command is just stuck.
>
> 4. After one second an abort comes in an is returned with success (line 1113)
> [ 88.869051] (scsi-1:-1:-1) (aha152x_internal_queue:1055) unlocked
> [ 89.884469] (scsi-1:-1:-1) (aha152x_abort:1113) locking
This all sounds correct to me (AFAIK).
> 5. Now a Test Unit Ready comes in. Already a good second and more after
> the eject. The card is clearly not powered by now.
> aha152x_internal_queue should check it's own presence. and return
> appropriate value.
> Two questions:
> a. What should be the return value from a queuecommand handler
> when the card is no longer present?
> b. What should we check to know we no longer have a card?
Anyone??
> 6. One more second passes and 2nd abort comes in.
> 7. Than a reset comes in. Here too Should driver check for hardware
> presence.
>
> since ds.c is doing: p_dev->_removed=1;
> before the shutdown. Maybe a solution is to have aha152x_stub.c,
> which is the only one that knows of PCMCIA, Override queuecommand
> and just check for p_dev->_removed==1. Something like:
>
>
>
> -------------------------------------------------------------------------------------------------------------
> diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c
> index d30a307..5fe55d0 100644
> --- a/drivers/scsi/aha152x.c
> +++ b/drivers/scsi/aha152x.c
> @@ -1062,7 +1063,7 @@ static int aha152x_internal_queue(Scsi_Cmnd *SCpnt,
> struct completion *complete,
> * queue a command
> *
> */
> -static int aha152x_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
> +int aha152x_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
> {
> #if 0
> if(*SCpnt->cmnd == REQUEST_SENSE) {
> diff --git a/drivers/scsi/aha152x.h b/drivers/scsi/aha152x.h
> index ac4bfa4..065612f 100644
> --- a/drivers/scsi/aha152x.h
> +++ b/drivers/scsi/aha152x.h
> @@ -333,5 +333,6 @@ struct aha152x_setup {
> struct Scsi_Host *aha152x_probe_one(struct aha152x_setup *);
> void aha152x_release(struct Scsi_Host *);
> int aha152x_host_reset_host(struct Scsi_Host *);
> +int aha152x_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *));
>
> #endif /* _AHA152X_H */
> diff --git a/drivers/scsi/pcmcia/aha152x_stub.c
> b/drivers/scsi/pcmcia/aha152x_stub.c
> index 370802d..e2f5ea5 100644
> --- a/drivers/scsi/pcmcia/aha152x_stub.c
> +++ b/drivers/scsi/pcmcia/aha152x_stub.c
> @@ -137,6 +137,19 @@ static void aha152x_detach(struct pcmcia_device *link)
> } /* aha152x_detach */
>
> /*====================================================================*/
> +static int aha152x_queue_cs(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
> +{
> +struct pcmcia_device *p_dev;
> +struct device *dev = &SCpnt->device->sdev_gendev;
> +
> + p_dev = to_pcmcia_dev(dev);
> + if (p_dev->_removed==1)
> + return ENODEV;
> +
> + return aha152x_queue(SCpnt, done);
> +}
> +
> +/*====================================================================*/
>
> #define CS_CHECK(fn, ret) \
> do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
> @@ -201,6 +214,7 @@ static int aha152x_config_cs(struct pcmcia_device *link)
> goto cs_failed;
> }
>
> + host->hostt->queuecommand = aha152x_queue_cs;
> sprintf(info->node.dev_name, "scsi%d", host->host_no);
> link->dev_node = &info->node;
> info->host = host;
> -------------------------------------------------------------------------------------------------------------
This makes sense, but it didn't work:
[ 68.771566] pccard: card ejected from slot 0
[ 68.781006] sd 2:0:4:0: [sdb] Synchronizing SCSI cache
[ 68.786311] (scsi2:4:0) queue: f7f1a950; cmd_len=10 pieces=0 size=0
cmnd=Synchronize Cache(10) 35 00 00 00 00 00 00 00 00 00
[ 68.797671] (scsi2:4:0) queue-simple: dir=3, buffer=sglist=00000000,
ptr=ADDR=00000000, this_resid=0, bufs_resid=0
[ 68.807976] (scsi-1:-1:-1) (aha152x_internal_queue:1075) locking
[ 68.813957] (scsi-1:-1:-1) (aha152x_internal_queue:1075) locked
[ 68.819853] (scsi-1:-1:-1) expecting: (busfree)
[ 68.824460] (scsi-1:-1:-1) (aha152x_internal_queue:1091) unlocking (locked
at aha152x_internal_queue:1075)
[ 68.834072] (scsi-1:-1:-1) (aha152x_internal_queue:1091) unlocked
[ 69.925905] (scsi2:4:0) abort(f7f1a950)<7>(scsi-1:-1:-1) (show_queues:3041)
locking
[ 69.933592] (scsi-1:-1:-1) (show_queues:3041) locked
[ 69.938538] queue status:
[ 69.938539] issue_SC:
[ 69.944902] sd 2:0:4:0: f7f1a950: cmnd=(Synchronize Cache(10) 35 00 00 00 00
00 00 00 00 00
[ 69.953403] ); request_bufflen=0; resid=0; phase |not issued|;
next=0x00000000
[ 69.960624] (scsi-1:-1:-1) (show_queues:3045) unlocking (locked at
show_queues:3041)
[ 69.968360] (scsi-1:-1:-1) (show_queues:3045) unlocked
[ 69.973488] current_SC:
[ 69.975936] none
[ 69.977781] disconnected_SC:
[ 70.047619] enabled interrupts ( ENSELDO ENSELDI ENSELINGO ENSWRAP ENSDONE
ENSPIORDY ENDMADONE ENSELTIMO ENATNTARG ENPHASEMIS ENBUSFREE ENSCSIPERR
ENPHASECHG ENREQINIT )
[ 70.063021] (scsi-1:-1:-1) (aha152x_abort:1149) locking
[ 70.068236] (scsi-1:-1:-1) (aha152x_abort:1149) locked
[ 70.073353] (scsi2:4:0) not yet issued - SUCCESS
[ 70.077953] (scsi-1:-1:-1) (aha152x_abort:1159) unlocking (locked at
aha152x_abort:1149)
[ 70.086020] (scsi-1:-1:-1) (aha152x_abort:1159) unlocked
[ 70.091325] (scsi2:4:0) queue: f7f1a950; cmd_len=6 pieces=0 size=0 cmnd=Test
Unit Ready 00 00 00 00 00 00
[ 70.100971] (scsi2:4:0) queue-simple: dir=3, buffer=sglist=00000000,
ptr=ADDR=00000000, this_resid=0, bufs_resid=0
[ 70.111274] (scsi-1:-1:-1) (aha152x_internal_queue:1075) locking
[ 70.117256] (scsi-1:-1:-1) (aha152x_internal_queue:1075) locked
[ 70.123152] (scsi-1:-1:-1) expecting: (busfree)
[ 70.127756] (scsi-1:-1:-1) (aha152x_internal_queue:1091) unlocking (locked
at aha152x_internal_queue:1075)
[ 70.137368] (scsi-1:-1:-1) (aha152x_internal_queue:1091) unlocked
[ 71.127877] (scsi2:4:0) abort(f7f1a950)<7>(scsi-1:-1:-1) (show_queues:3041)
locking
[ 71.135588] (scsi-1:-1:-1) (show_queues:3041) locked
[ 71.140534] queue status:
[ 71.140535] issue_SC:
[ 71.146895] sd 2:0:4:0: f7f1a950: cmnd=(Test Unit Ready 00 00 00 00 00 00
[ 71.153777] ); request_bufflen=0; resid=0; phase |not issued|;
next=0x00000000
[ 71.160999] (scsi-1:-1:-1) (show_queues:3045) unlocking (locked at
show_queues:3041)
[ 71.168759] (scsi-1:-1:-1) (show_queues:3045) unlocked
[ 71.173887] current_SC:
[ 71.176336] none
[ 71.178174] disconnected_SC:
[ 71.248007] enabled interrupts ( ENSELDO ENSELDI ENSELINGO ENSWRAP ENSDONE
ENSPIORDY ENDMADONE ENSELTIMO ENATNTARG ENPHASEMIS ENBUSFREE ENSCSIPERR
ENPHASECHG ENREQINIT )
[ 71.263415] (scsi-1:-1:-1) (aha152x_abort:1149) locking
[ 71.268632] (scsi-1:-1:-1) (aha152x_abort:1149) locked
[ 71.273748] (scsi2:4:0) not yet issued - SUCCESS
[ 71.278350] (scsi-1:-1:-1) (aha152x_abort:1159) unlocking (locked at
aha152x_abort:1149)
[ 71.286436] (scsi-1:-1:-1) (aha152x_abort:1159) unlocked
[ 71.291750] (scsi2:4:0) aha152x_device_reset(f7f1a950)<7>(scsi-1:-1:-1)
(show_queues:3041) locking
[ 71.300726] (scsi-1:-1:-1) (show_queues:3041) locked
[ 71.305669] queue status:
[ 71.305669] issue_SC:
[ 71.312029] (scsi-1:-1:-1) (show_queues:3045) unlocking (locked at
show_queues:3041)
[ 71.319769] (scsi-1:-1:-1) (show_queues:3045) unlocked
[ 71.324898] current_SC:
[ 71.327340] none
[ 71.329182] disconnected_SC:
[ 71.399049] enabled interrupts ( ENSELDO ENSELDI ENSELINGO ENSWRAP ENSDONE
ENSPIORDY ENDMADONE ENSELTIMO ENATNTARG ENPHASEMIS ENBUSFREE ENSCSIPERR
ENPHASECHG ENREQINIT )
[ 71.414455] (scsi-1:-1:-1) (aha152x_device_reset:1206) locking
[ 71.420274] (scsi-1:-1:-1) (aha152x_device_reset:1206) locked
[ 71.425996] (scsi-1:-1:-1) (aha152x_device_reset:1209) unlocking (locked at
aha152x_device_reset:1206)
[ 71.435275] (scsi-1:-1:-1) (aha152x_device_reset:1209) unlocked
[ 71.441208] (scsi2:4:0) queue: f7f1a950; cmd_len=0 pieces=0 size=0
cmnd=Synchronize Cache(10) 35 00 00 00 00 00 00 00 00 00
[ 71.452569] (scsi2:4:0) cannot reuse command
[ 75.237817] (scsi-1:-1:-1) (aha152x_device_reset:1218) locking
[ 75.243664] (scsi-1:-1:-1) (aha152x_device_reset:1218) locked
[ 75.249387] (scsi-1:-1:-1) (aha152x_device_reset:1220) unlocking (locked at
aha152x_device_reset:1218)
[ 75.258686] (scsi-1:-1:-1) (aha152x_device_reset:1220) unlocked
[ 75.264592] (scsi-1:-1:-1) (aha152x_device_reset:1225) locking
[ 75.270414] (scsi-1:-1:-1) (aha152x_device_reset:1225) locked
[ 75.276137] (scsi-1:-1:-1) (aha152x_device_reset:1246) unlocking (locked at
aha152x_device_reset:1225)
[ 75.285417] (scsi-1:-1:-1) (aha152x_device_reset:1246) unlocked
[ 75.291345] (scsi-1:-1:-1) (aha152x_bus_reset_host:1285) locking
[ 75.297340] (scsi-1:-1:-1) (aha152x_bus_reset_host:1285) locked
[ 75.303237] scsi2: bus reset<7>(scsi-1:-1:-1) (show_queues:3041) already
locked at aha152x_bus_reset_host:1285
[ 75.313213] (scsi-1:-1:-1) (show_queues:3041) locking
[ 75.318245] BUG: spinlock recursion on CPU#0, scsi_eh_2/6093
[ 75.323882] lock: f7f4a518, .magic: dead4ead, .owner: scsi_eh_2/6093,
.owner_cpu: 0
[ 75.331591] [<c0103644>] show_trace_log_lvl+0x1a/0x2f
[ 75.336727] [<c0104031>] show_trace+0x12/0x14
[ 75.341170] [<c0104049>] dump_stack+0x16/0x18
[ 75.345615] [<c01d780a>] spin_bug+0x94/0xdf
[ 75.349885] [<c01d78f7>] _raw_spin_lock+0x35/0x102
[ 75.354759] [<c033d5f0>] _spin_lock_irqsave+0xc/0x11
[ 75.359811] [<f8b78490>] show_queues+0x122/0x478 [aha152x_cs]
[ 75.365643] [<f8b78c72>] aha152x_bus_reset_host+0x1d0/0x3af [aha152x_cs]
[ 75.372422] [<f8b78ece>] aha152x_bus_reset+0xc/0xe [aha152x_cs]
[ 75.378423] [<c027552d>] scsi_try_bus_reset+0x46/0x9a
[ 75.383558] [<c0275f49>] scsi_eh_ready_devs+0x26d/0x41b
[ 75.388865] [<c02768fe>] scsi_error_handler+0x2d6/0x460
[ 75.394174] [<c0129512>] kthread+0x3b/0x61
[ 75.398356] [<c01032bf>] kernel_thread_helper+0x7/0x10
[ 75.403580] =======================
[ 211.336753] BUG: spinlock lockup on CPU#0, scsi_eh_2/6093, f7f4a518
[ 211.342993] [<c0103644>] show_trace_log_lvl+0x1a/0x2f
[ 211.348127] [<c0104031>] show_trace+0x12/0x14
[ 211.352571] [<c0104049>] dump_stack+0x16/0x18
[ 211.357018] [<c01d799c>] _raw_spin_lock+0xda/0x102
[ 211.361893] [<c033d5f0>] _spin_lock_irqsave+0xc/0x11
[ 211.366943] [<f8b78490>] show_queues+0x122/0x478 [aha152x_cs]
[ 211.372770] [<f8b78c72>] aha152x_bus_reset_host+0x1d0/0x3af [aha152x_cs]
[ 211.379550] [<f8b78ece>] aha152x_bus_reset+0xc/0xe [aha152x_cs]
[ 211.385552] [<c027552d>] scsi_try_bus_reset+0x46/0x9a
[ 211.390686] [<c0275f49>] scsi_eh_ready_devs+0x26d/0x41b
[ 211.395994] [<c02768fe>] scsi_error_handler+0x2d6/0x460
[ 211.401302] [<c0129512>] kthread+0x3b/0x61
[ 211.405483] [<c01032bf>] kernel_thread_helper+0x7/0x10
[ 211.410705] =======================
> But you will have to totally check me out on that: to_pcmcia_dev()
> thing above.
Looks OK to me.
> And maybe it is plain lobotomy. I wish sd.c could Just signal the
> SCSI device that it is on the shutdown path.
>
> Or maybe my original Question. How can a card identify it's un-presence?
---
~Randy
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