linux-kernel - [ 18/61] SCSI: mpt2sas: Fix unsafe using smp_processor

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Message-Id: <20120620173022.519191101@linuxfoundation.org>
Date:	Wed, 20 Jun 2012 10:30:38 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@....com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [ 18/61] SCSI: mpt2sas: Fix unsafe using smp_processor_id() in preemptible

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "nagalakshmi.nandigama@....com" <nagalakshmi.nandigama@....com>

commit a2c658505bf5c75516ee0a79287223e86a2474af upstream.

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 <nagalakshmi.nandigama@....com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/mpt2sas/mpt2sas_base.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -1785,7 +1785,7 @@ static inline void _base_writeq(__u64 b,
 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()];
 }
 
 /**


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