scsi: qla2xxx: Format log strings only if needed

Commit 598a90f ("scsi: qla2xxx: add ring buffer for tracing debug
logs") introduced unconditional log string formatting to ql_dbg() even if
ql_dbg_log event is disabled. It harms performance because some strings are
formatted in fastpath and/or interrupt context.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 598a90f ("scsi: qla2xxx: add ring buffer for tracing debug logs")
Cc: Rajan Shanmugavelu <[email protected]>
Cc: [email protected]
Signed-off-by: Roman Bolshakov <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Roman Bolshakov

drivers/scsi/qla2xxx/qla_dbg.c

@@ -2491,6 +2491,9 @@ ql_dbg(uint level, scsi_qla_host_t *vha, uint id, const char *fmt, ...)
 	struct va_format vaf;
 	char pbuf[64];
 
+	if (!ql_mask_match(level) && !trace_ql_dbg_log_enabled())
+		return;
+
 	va_start(va, fmt);
 
 	vaf.fmt = fmt;