From mboxrd@z Thu Jan 1 00:00:00 1970 From: Subject: [PATCH] [SCSI] mpt2sas : Fix unsafe using smp_processor_id() in preemptible Date: Tue, 17 Apr 2012 11:25:04 +0530 Message-ID: <201204170553.q3H5rgCl016528@milmhbs0.lsil.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from na3sys009aog107.obsmtp.com ([74.125.149.197]:51966 "EHLO na3sys009aog107.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752200Ab2DQFxq (ORCPT ); Tue, 17 Apr 2012 01:53:46 -0400 Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: stable@vger.kernel.org, linux-scsi@vger.kernel.org, Nagalakshmi.Nandigama@lsi.com, Sathya.Prakash@lsi.com, Eric.Moore@lsi.com Cc: jejb@kernel.org When CONFIG_DEBUG_PREEMPT is enabled, bug is observed in the smp_processor_id(). This is because smp_processor_id() is not called in preempt safe condition. To fix this issue, use raw_smp_processor_id instead of smp_processor_id. Signed-off-by: Nagalakshmi Nandigama CC: stable@vger.kernel.org --- diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c index 272fab7..b010be0 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_base.c +++ b/drivers/scsi/mpt2sas/mpt2sas_base.c @@ -1792,7 +1792,7 @@ static inline void _base_writeq(__u64 b, volatile void __iomem *addr, static inline u8 _base_get_msix_index(struct MPT2SAS_ADAPTER *ioc) { - return ioc->cpu_msix_table[smp_processor_id()]; + return ioc->cpu_msix_table[raw_smp_processor_id()]; } /**