nvmet: demote discovery cmd parse err msg to debug

ChaitanayaKulkarni · Christoph Hellwig · commit 3651aaacd10b · 2021-05-11T18:30:45.000+02:00
Host can send invalid commands and flood the target with error messages
for the discovery controller. Demote the error message from pr_err() to
pr_debug( in nvmet_parse_discovery_cmd(). 

Signed-off-by: Chaitanya Kulkarni &lt;chaitanya.kulkarni@wdc.com&gt;
Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c
@@ -379,7 +379,7 @@ u16 nvmet_parse_discovery_cmd(struct nvmet_req *req)
 		req->execute = nvmet_execute_disc_identify;
 		return 0;
 	default:
-		pr_err("unhandled cmd %d\n", cmd->common.opcode);
+		pr_debug("unhandled cmd %d\n", cmd->common.opcode);
 		req->error_loc = offsetof(struct nvme_common_command, opcode);
 		return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
 	}

Original file line number	Diff line number	Diff line change
`@@ -379,7 +379,7 @@ u16 nvmet_parse_discovery_cmd(struct nvmet_req *req)`
`379`	`379`	`req->execute = nvmet_execute_disc_identify;`
`380`	`380`	`return 0;`
`381`	`381`	`default:`
`382`		`- pr_err("unhandled cmd %d\n", cmd->common.opcode);`
	`382`	`+ pr_debug("unhandled cmd %d\n", cmd->common.opcode);`
`383`	`383`	`req->error_loc = offsetof(struct nvme_common_command, opcode);`
`384`	`384`	`return NVME_SC_INVALID_OPCODE \| NVME_SC_DNR;`
`385`	`385`	`}`