This is a note to let you know that I've just added the patch titled
SCSI: mpt2sas: Fix unsafe using smp_processor_id() in preemptible
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-mpt2sas-fix-unsafe-using-smp_processor_id-in-preemptible.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a2c658505bf5c75516ee0a79287223e86a2474af Mon Sep 17 00:00:00 2001
From: "[email protected]" <[email protected]>
Date: Tue, 17 Apr 2012 11:25:04 +0530
Subject: SCSI: mpt2sas: Fix unsafe using smp_processor_id() in preemptible
From: "[email protected]" <[email protected]>
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 <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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()];
}
/**
Patches currently in stable-queue which might be from
[email protected] are
queue-3.4/scsi-mpt2sas-fix-unsafe-using-smp_processor_id-in-preemptible.patch
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