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scsi: target: iblock: Fix smp_processor_id() BUG messages

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This has us use raw_smp_processor_id() in iblock's plug_device callout.
smp_processor_id() is not needed here, because we are running from a per
CPU work item that is also queued to run on a worker thread that is
normally bound to a specific CPU. If the worker thread did end up switching
CPUs then it's handled the same way we handle when the work got moved to a
different CPU's worker thread, where we will just end up sending I/O from
the new CPU.

Link: https://lore.kernel.org/r/20210519222640.5153-1-michael.christie@oracle.com
Fixes: 415ccd9811da ("scsi: target: iblock: Add backend plug/unplug callouts")
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2021-05-19 17:26:40 -05:00 committed by Martin K. Petersen
parent 8c7e7b8486
commit 5aaeca258f
1 changed files with 2 additions and 2 deletions
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4
drivers/target/target_core_iblock.c
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@ -204,11 +204,11 @@ static struct se_dev_plug *iblock_plug_device(struct se_device *se_dev)
struct iblock_dev_plug *ib_dev_plug;
/*
* Each se_device has a per cpu work this can be run from. Wwe
* Each se_device has a per cpu work this can be run from. We
* shouldn't have multiple threads on the same cpu calling this
* at the same time.
*/
ib_dev_plug = &ib_dev->ibd_plug[smp_processor_id()];
ib_dev_plug = &ib_dev->ibd_plug[raw_smp_processor_id()];
if (test_and_set_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags))
return NULL;