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| author |   Martin K. Petersen <martin.petersen@oracle.com> | 2022-03-02 00:35:48 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-05-02 16:59:11 -0400 |
| commit | d657700ccac71da19a4d1a591fafcd598ce0dd6e (patch) | |
| tree | ac3f1a1ec2a1c600f1394c9819cc136eab9eeeb9 | |
| parent | scsi: core: Cache VPD pages b0, b1, b2 (diff) | |
| download | linux-dev-d657700ccac71da19a4d1a591fafcd598ce0dd6e.tar.xz linux-dev-d657700ccac71da19a4d1a591fafcd598ce0dd6e.zip | |
scsi: core: Do not truncate INQUIRY data on modern devices
Low-level device drivers have had the ability to limit the size of an
INQUIRY for many years. This made sense for a wide variety of legacy
devices. However, we are unnecessarily truncating the INQUIRY response for
many modern devices. This prevents us from consulting fields beyond the
first 36 bytes.
If a device reports that it supports a larger INQUIRY response, and the
device also reports that it implements SPC-4 or newer, allow the larger
INQUIRY to proceed.
Link: https://lore.kernel.org/r/20220302053559.32147-4-martin.petersen@oracle.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/scsi_scan.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 2ef78083f1ef..91ac901a6682 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -733,7 +733,17 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, if (pass == 1) { if (BLIST_INQUIRY_36 & *bflags) next_inquiry_len = 36; - else if (sdev->inquiry_len) + /* + * LLD specified a maximum sdev->inquiry_len + * but device claims it has more data. Capping + * the length only makes sense for legacy + * devices. If a device supports SPC-4 (2014) + * or newer, assume that it is safe to ask for + * as much as the device says it supports. + */ + else if (sdev->inquiry_len && + response_len > sdev->inquiry_len && + (inq_result[2] & 0x7) < 6) /* SPC-4 */ next_inquiry_len = sdev->inquiry_len; else next_inquiry_len = response_len; |