linux-kernel - RE: [BUGFIX PATCH][RESEND] kexec & iosapic: kexec oops when iosapic was removed

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Date:	Mon, 13 Aug 2012 02:54:09 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Hanjun Guo <guohanjun@...wei.com>,
	"Yu, Fenghua" <fenghua.yu@...el.com>
CC:	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Eric Biederman <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Haren Myneni <hbabu@...ibm.com>,
	Toshi Kani <toshi.kani@...com>,
	Yinghai Lu <yinghai@...nel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Jianguo Wu <wujianguo@...wei.com>
Subject: RE: [BUGFIX PATCH][RESEND] kexec & iosapic: kexec oops when iosapic
 was removed

>		vec = irq_to_vector(irq);
> 		list_for_each_entry(rte, &info->rtes,
> 				rte_list) {
> +			if (rte->refcnt == NO_REF_RTE)
> +				continue;
> +
> 			iosapic_write(rte->iosapic,
> 					IOSAPIC_RTE_LOW(rte->rte_index),
> 					IOSAPIC_MASK|vec);

This will work - but is it papering over a problem when you removed the
iosapic? Should we really have removed this "rte" from rte_list when the
iosapic was removed?

-Tony

.




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