Messages in this thread Patch in this message |  | | From | Calvin Owens <> | Subject | [PATCH 1/6] Add refcount to sas_device struct | Date | Thu, 14 May 2015 20:41:57 -0700 |
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These objects can be referenced concurrently throughout the driver, we need a way to make sure threads can't delete them out from under each other.
Signed-off-by: Calvin Owens <calvinowens@fb.com> --- drivers/scsi/mpt2sas/mpt2sas_base.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h index caff8d1..2e7dc33 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_base.h +++ b/drivers/scsi/mpt2sas/mpt2sas_base.h @@ -376,8 +376,24 @@ struct _sas_device { u8 phy; u8 responding; u8 pfa_led_on; + struct kref refcount; }; +static inline void sas_device_get(struct _sas_device *s) +{ + kref_get(&s->refcount); +} + +static inline void sas_device_free(struct kref *r) +{ + kfree(container_of(r, struct _sas_device, refcount)); +} + +static inline void sas_device_put(struct _sas_device *s) +{ + kref_put(&s->refcount, sas_device_free); +} + /** * struct _raid_device - raid volume link list * @list: sas device list -- 1.8.1
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