[PATCH v2 1/2] scsi: core: Introduce the BLIST_SKIP_IO_HINTS flag

Bart Van Assche
2024-06-12T20:37:48Z

Prepare for skipping reading the IO hints VPD page for USB storage devices.

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Joao Machado <jocrismachado@gmail.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Christian Heusel <christian@heusel.eu>
Cc: stable@vger.kernel.org
Fixes: 4f53138fffc2 ("scsi: sd: Translate data lifetime information")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/sd.c | 4 ++++
include/scsi/scsi_devinfo.h | 4 +++-
2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3a43e2209751..fcf3d7730466 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -63,6 +63,7 @@
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
+#include <scsi/scsi_devinfo.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
@@ -3117,6 +3118,9 @@ static void sd_read_io_hints(struct scsi_disk *sdkp, unsigned char *buffer)
struct scsi_mode_data data;
int res;

+ if (sdp->sdev_bflags & BLIST_SKIP_IO_HINTS)
+ return;
+
res = scsi_mode_sense(sdp, /*dbd=*/0x8, /*modepage=*/0x0a,
/*subpage=*/0x05, buffer, SD_BUF_SIZE, SD_TIMEOUT,
sdkp->max_retries, &data, &sshdr);
diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h
index 6b548dc2c496..fa8721e49dec 100644
--- a/include/scsi/scsi_devinfo.h
+++ b/include/scsi/scsi_devinfo.h
@@ -69,8 +69,10 @@
#define BLIST_RETRY_ITF ((__force blist_flags_t)(1ULL << 32))
/* Always retry ABORTED_COMMAND with ASC 0xc1 */
#define BLIST_RETRY_ASC_C1 ((__force blist_flags_t)(1ULL << 33))
+/* Do not read the I/O hints mode page */
+#define BLIST_SKIP_IO_HINTS ((__force blist_flags_t)(1ULL << 34))

-#define __BLIST_LAST_USED BLIST_RETRY_ASC_C1
+#define __BLIST_LAST_USED BLIST_SKIP_IO_HINTS

#define __BLIST_HIGH_UNUSED (~(__BLIST_LAST_USED | \
(__force blist_flags_t) \