Re: [PATCH 17/24] snic: reserve tag for TMF

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On 5/3/22 11:31, Hannes Reinecke wrote:
On 5/3/22 09:18, Bart Van Assche wrote:
On 5/2/22 14:38, Hannes Reinecke wrote:
diff --git a/drivers/scsi/snic/snic_main.c b/drivers/scsi/snic/snic_main.c
index 29d56396058c..f344cbc27923 100644
--- a/drivers/scsi/snic/snic_main.c
+++ b/drivers/scsi/snic/snic_main.c
@@ -512,6 +512,9 @@ snic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
                       max_t(u32, SNIC_MIN_IO_REQ, max_ios));
      snic->max_tag_id = shost->can_queue;
+    /* Reserve one reset command */
+    shost->can_queue--;
+    snic->tmf_tag_id = shost->can_queue;
      shost->max_lun = snic->config.luns_per_tgt;
      shost->max_id = SNIC_MAX_TARGET;

Hmm ... shouldn't cmd_per_lun also be decreased?

Shudder. No. Why?

I found the answer. The following code from scsi_add_host_with_dma() reduces cmd_per_lun so it is not necessary to do that from inside snic_probe():

	shost->cmd_per_lun = min_t(int, shost->cmd_per_lun,
				   shost->can_queue);

Bart.



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