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Subject[PATCH v2] scsi: introduce short_inquiry flag for broken host adapters
Date
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 host template flag
to avoid printing error messages for such adapters.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
Changes since v1:
- This is a successor of previously sent "scsi_scan: move 'INQUIRY result
too short' message to debug level" patch. Instead of moving the message
to debug level for all adapters introduce a special 'short_inquiry' flag
for host template [inspired by James Bottomley].
---
drivers/scsi/scsi_scan.c | 7 ++++---
drivers/scsi/storvsc_drv.c | 1 +
include/scsi/scsi_host.h | 6 ++++++
3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index f9f3f82..f1d00a0 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -701,9 +701,10 @@ 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->hostt->short_inquiry)
+ sdev_printk(KERN_INFO, sdev,
+ "scsi scan: INQUIRY result too short (%d),"
+ " using 36\n", sdev->inquiry_len);
sdev->inquiry_len = 36;
}

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 3c6584f..f3b4d0f 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1711,6 +1711,7 @@ static struct scsi_host_template scsi_driver = {
/* Make sure we dont get a sg segment crosses a page boundary */
.dma_boundary = PAGE_SIZE-1,
.no_write_same = 1,
+ .short_inquiry = 1,
};

enum {
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index e113c75..7b022af 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -454,6 +454,12 @@ struct scsi_host_template {
unsigned no_async_abort:1;

/*
+ * True if this host adapter returns short (<36 bytes) responses to
+ * some INQUIRY requests.
+ */
+ unsigned short_inquiry:1;
+
+ /*
* Countdown for host blocking with no commands outstanding.
*/
unsigned int max_host_blocked;
--
2.4.3


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