| From a2c658505bf5c75516ee0a79287223e86a2474af Mon Sep 17 00:00:00 2001 |
| From: "nagalakshmi.nandigama@lsi.com" <nagalakshmi.nandigama@lsi.com> |
| Date: Tue, 17 Apr 2012 11:25:04 +0530 |
| Subject: SCSI: mpt2sas: Fix unsafe using smp_processor_id() in preemptible |
| |
| 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()]; |
| } |
| |
| /** |
