[Scst-svn] SF.net SVN: scst:[6206] trunk/scst/src/scst_targ.c

[<vl...@us...>]

Revision: 6206
          http://sourceforge.net/p/scst/svn/6206
Author:   vlnb
Date:     2015-05-09 03:17:16 +0000 (Sat, 09 May 2015)
Log Message:
-----------
Disable preemption during tasklet schedule for per-CPU variable usage

Modified Paths:
--------------
    trunk/scst/src/scst_targ.c

Modified: trunk/scst/src/scst_targ.c
===================================================================
--- trunk/scst/src/scst_targ.c	2015-05-09 03:16:19 UTC (rev 6205)
+++ trunk/scst/src/scst_targ.c	2015-05-09 03:17:16 UTC (rev 6206)
@@ -73,9 +73,13 @@
 
 static inline void scst_schedule_tasklet(struct scst_cmd *cmd)
 {
-	struct scst_percpu_info *i = &scst_percpu_infos[smp_processor_id()];
+	struct scst_percpu_info *i;
 	unsigned long flags;
 
+	preempt_disable();
+
+	i = &scst_percpu_infos[smp_processor_id()];
+
 	if (atomic_read(&i->cpu_cmd_count) <= scst_max_tasklet_cmd) {
 		spin_lock_irqsave(&i->tasklet_lock, flags);
 		TRACE_DBG("Adding cmd %p to tasklet %d cmd list", cmd,
@@ -93,6 +97,8 @@
 		wake_up(&cmd->cmd_threads->cmd_list_waitQ);
 		spin_unlock_irqrestore(&cmd->cmd_threads->cmd_list_lock, flags);
 	}
+
+	preempt_enable();
 	return;
 }
 

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