Messages in this thread Patch in this message | | | Date | Wed, 20 Jun 2012 10:30:38 -0700 | From | Greg KH <> | Subject | [ 18/61] SCSI: mpt2sas: Fix unsafe using smp_processor_id() in preemptible |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: "nagalakshmi.nandigama@lsi.com" <nagalakshmi.nandigama@lsi.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@lsi.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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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