5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Kai Mäkisara Kai.Makisara@kolumbus.fi
[ Upstream commit 8db816c6f176321e42254badd5c1a8df8bfcfdb4 ]
In the days when SCSI-2 was emerging, some drives did claim SCSI-2 but did not correctly implement it. The st driver first tries MODE SELECT with the page format bit set to set the block descriptor. If not successful, the non-page format is tried.
The test only tests the sense code and this triggers also from illegal parameter in the parameter list. The test is limited to "old" devices and made more strict to remove false alarms.
Signed-off-by: Kai Mäkisara Kai.Makisara@kolumbus.fi Link: https://lore.kernel.org/r/20250311112516.5548-4-Kai.Makisara@kolumbus.fi Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/st.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 2b5e3e2ba3b8b..8f927851ccf86 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -3076,7 +3076,9 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon cmd_in == MTSETDRVBUFFER || cmd_in == SET_DENS_AND_BLK) { if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && - !(STp->use_pf & PF_TESTED)) { + cmdstatp->sense_hdr.asc == 0x24 && + (STp->device)->scsi_level <= SCSI_2 && + !(STp->use_pf & PF_TESTED)) { /* Try the other possible state of Page Format if not already tried */ STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;