On 11/19/2015 02:17 PM, Vitaly Kuznetsov wrote:
> Some host adapters (e.g. Hyper-V storvsc) are known for not respecting the
> SPC-2/3/4 requirement for 'INQUIRY data (see table ...) shall contain at
> least 36 bytes'. As a result we get tons on 'scsi 0:7:1:1: scsi scan:
> INQUIRY result too short (5), using 36' messages on console. This can be
> problematic for slow consoles. Introduce short_inquiry flag in struct
> Scsi_Host to print the message once per host.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
> ---
> Changes since v3 RESEND:
> - No changes, this is just a RESEND.
>
> Changes since v3:
> - No changes, this is just a RESEND.
>
> Changes since v2:
> - This is a successor of previously sent (and still not merged) "scsi:
> introduce short_inquiry flag for broken host adapters" patch. I'm not
> particularly sure which solution is better but I'm leaning towards this
> one as it doesn't require changes to adapter drivers.
> ---
> drivers/scsi/scsi_scan.c | 9 ++++++---
> include/scsi/scsi_host.h | 3 +++
> 2 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
> index 8324539..054923e 100644
> --- a/drivers/scsi/scsi_scan.c
> +++ b/drivers/scsi/scsi_scan.c
> @@ -701,9 +701,12 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
> * strings.
> */
> if (sdev->inquiry_len < 36) {
> - sdev_printk(KERN_INFO, sdev,
> - "scsi scan: INQUIRY result too short (%d),"
> - " using 36\n", sdev->inquiry_len);
> + if (!sdev->host->short_inquiry) {
> + shost_printk(KERN_INFO, sdev->host,
> + "scsi scan: INQUIRY result too short (%d),"
> + " using 36\n", sdev->inquiry_len);
> + sdev->host->short_inquiry = 1;
> + }
> sdev->inquiry_len = 36;
> }
>
> diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
> index ed52712..fcfa3d7 100644
> --- a/include/scsi/scsi_host.h
> +++ b/include/scsi/scsi_host.h
> @@ -668,6 +668,9 @@ struct Scsi_Host {
> unsigned use_blk_mq:1;
> unsigned use_cmd_list:1;
>
> + /* Host responded with short (<36 bytes) INQUIRY result */
> + unsigned short_inquiry:1;
> +
> /*
> * Optional work queue to be utilized by the transport
> */
>
Ok, that's fine with me.
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +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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