[PATCH 09/23] scsi: use the atomic queue limits API in scsi_add_lun

Christoph Hellwig
2024-04-09T14:38:26Z

Switch scsi_add_lun to use the atomic queue limits API to update the
max_hw_sectors for devices with quirks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
drivers/scsi/scsi_scan.c | 28 +++++++++++++++-------------
1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 205ab3b3ea89be..1ec4b309af726d 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -874,6 +874,7 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
blist_flags_t *bflags, int async)
{
+ struct queue_limits lim;
int ret;

/*
@@ -1004,19 +1005,6 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
if (*bflags & BLIST_SELECT_NO_ATN)
sdev->select_no_atn = 1;

- /*
- * Maximum 512 sector transfer length
- * broken RA4x00 Compaq Disk Array
- */
- if (*bflags & BLIST_MAX_512)
- blk_queue_max_hw_sectors(sdev->request_queue, 512);
- /*
- * Max 1024 sector transfer length for targets that report incorrect
- * max/optimal lengths and relied on the old block layer safe default
- */
- else if (*bflags & BLIST_MAX_1024)
- blk_queue_max_hw_sectors(sdev->request_queue, 1024);
-
/*
* Some devices may not want to have a start command automatically
* issued when a device is added.
@@ -1077,6 +1065,20 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,

transport_configure_device(&sdev->sdev_gendev);

+ /*
+ * No need to freeze the queue as it isn't reachable to anyone else yet.
+ */
+ lim = queue_limits_start_update(sdev->request_queue);
+ if (*bflags & BLIST_MAX_512)
+ lim.max_hw_sectors = 512;
+ else if (*bflags & BLIST_MAX_1024)
+ lim.max_hw_sectors = 1024;
+ ret = queue_limits_commit_update(sdev->request_queue, &lim);
+ if (ret) {
+ sdev_printk(KERN_ERR, sdev, "failed to apply queue limits.\n");
+ return SCSI_SCAN_NO_RESPONSE;
+ }
+
if (sdev->host->hostt->slave_configure) {
ret = sdev->host->hostt->slave_configure(sdev);
if (ret) {
--
2.39.2