On 04/27/2016 10:48 AM, Johannes Thumshirn wrote:
> The qla1280 driver sets the scsi_host_template's can_queue field to 0xfffff
> which results in an allocation failure when allocating the block layer tags
> for the driver's queues. This was introduced with the change for host wide
> tags in commit 64d513ac31b - "scsi: use host wide tags by default".
>
> Reduce can_queue to MAX_OUTSTANDING_COMMANDS (512) to solve the allocation
> error.
>
> Signed-off-by: Johannes Thumshirn <jthumsh...@suse.de>
> Fixes: 64d513ac31b - "scsi: use host wide tags by default"
> Cc: sta...@vger.kernel.org # v4.4
> Cc: Laura Abbott <labb...@redhat.com>
> Cc: Michael Reed <m...@sgi.com>
> Reviewed-by: Laurence Oberman <lober...@redhat.com>
> Reviewed-by: Lee Duncan <ldun...@suse.com>
> ---
> Changes to v4:
> * Make subject more meaningfull
> * Remove warning's backtrace
> * Re-add reference to commit 64d513ac31b - "scsi: use host wide tags by
> default"
>
> Changes to v3:
> * Use MAX_OUTSTANDING_COMMANDS insted of hard coded magical number
>
> Changes to v2:
> * Change can_queue to 512 upon James' request
>
> drivers/scsi/qla1280.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
> index 5d0ec42..634254a 100644
> --- a/drivers/scsi/qla1280.c
> +++ b/drivers/scsi/qla1280.c
> @@ -4214,7 +4214,7 @@ static struct scsi_host_template
> qla1280_driver_template = {
> .eh_bus_reset_handler = qla1280_eh_bus_reset,
> .eh_host_reset_handler = qla1280_eh_adapter_reset,
> .bios_param = qla1280_biosparam,
> - .can_queue = 0xfffff,
> + .can_queue = MAX_OUTSTANDING_COMMANDS,
> .this_id = -1,
> .sg_tablesize = SG_ALL,
> .use_clustering = ENABLE_CLUSTERING,
>
Hmm.
The driver has this:
ha->request_ring = pci_alloc_consistent(ha->pdev,
((REQUEST_ENTRY_CNT + 1) * sizeof(request_t)),
&ha->request_dma);
and
/* ISP request and response entry counts (37-65535) */
#define REQUEST_ENTRY_CNT 255 /* Number of request entries. */
#define RESPONSE_ENTRY_CNT 63 /* Number of response entries. */
IE the driver (as it stands currently) will never be able to queue
more than 255 requests.
So where's the point in setting can_queue to 512? Shouldn't we
rather use 255 here?
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
h...@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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