I am submitting this patch which converts instances of tasklets
in drivers/scsi/* to bottom half workqueues. I appreciate your
feedback and suggestion on the changes.
Note: The patch is only compile tested.
In the patcheset, you will notice *FIXME* in two places:
1. pm8001/pm8001_init.c @ pm8001_work(struct work_struct *t)
2. pmcraid.c @ pmcraid_work_function(struct work_struct *t)
The current implementation limits context-aware processing
within work functions due to the lack of a mechanism to identify
the source work_struct in the array. The proposed solution wraps
each work_struct with a struct work_wrapper, adding crucial context
like the array index and a reference to the parent data structure.
Ex:
#define SOME_CONSTANT 10
struct xxx_data {
.....
struct work_struct work[SOME_CONSTANT]:
.....
};
The xxx_data module currently uses an array of work_structs
for scheduling work, but it lacks the ability to identify which
array element is associated with a specific invocation of the work
function. This limitation prevents the execution of context-specific
actions based on the source of the work request.
The proposed solution is to introduce a struct work_wrapper that
encapsulates each work_struct along with additional metadata,
including an index and a pointer to the parent xxx_data structure.
This enhancement allows the work function to access necessary
context information.
Changes:
1. Definition of struct work_wrapper:
struct work_wrapper {
struct work_struct work;
struct xxx_data *data;
int index;
};
struct xxx_data {
struct work_wrapper work[SOME_CONSTANT];
};
During initialization:
for (int i = 0; i < SOME_CONSTANT; i++) {
p->work[i].data = p;
p->work[i].index = i;
INIT_WORK(&p->work[i].work, work_func);
}
And it's usage in the handler:
void work_func(struct work_struct *t)
{
struct work_wrapper *wrapper = from_work(wrapper, t, work);
struct xxx_data *a = wrapper->data;
int index = wrapper->index;
....
}
If the above is solution is acceptable, I can have the same
incorporated in version 2.
Thanks.
Allen Pais (1):
[RFC] scsi: Convert from tasklet to BH workqueue
drivers/scsi/aic7xxx/aic7xxx_osm.c | 2 +-
drivers/scsi/aic94xx/aic94xx_hwi.c | 14 ++--
drivers/scsi/aic94xx/aic94xx_hwi.h | 5 +-
drivers/scsi/aic94xx/aic94xx_scb.c | 36 +++++-----
drivers/scsi/aic94xx/aic94xx_task.c | 14 ++--
drivers/scsi/aic94xx/aic94xx_tmf.c | 34 +++++-----
drivers/scsi/esas2r/esas2r.h | 12 ++--
drivers/scsi/esas2r/esas2r_init.c | 14 ++--
drivers/scsi/esas2r/esas2r_int.c | 18 ++---
drivers/scsi/esas2r/esas2r_io.c | 2 +-
drivers/scsi/esas2r/esas2r_main.c | 16 ++---
drivers/scsi/ibmvscsi/ibmvfc.c | 16 ++---
drivers/scsi/ibmvscsi/ibmvfc.h | 3 +-
drivers/scsi/ibmvscsi/ibmvscsi.c | 16 ++---
drivers/scsi/ibmvscsi/ibmvscsi.h | 3 +-
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 15 ++---
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h | 3 +-
drivers/scsi/isci/host.c | 12 ++--
drivers/scsi/isci/host.h | 8 +--
drivers/scsi/isci/init.c | 4 +-
drivers/scsi/megaraid/mega_common.h | 5 +-
drivers/scsi/megaraid/megaraid_mbox.c | 21 +++---
drivers/scsi/megaraid/megaraid_sas.h | 4 +-
drivers/scsi/megaraid/megaraid_sas_base.c | 32 +++++----
drivers/scsi/megaraid/megaraid_sas_fusion.c | 16 ++---
drivers/scsi/mvsas/mv_init.c | 27 ++++----
drivers/scsi/mvsas/mv_sas.h | 9 +--
drivers/scsi/pm8001/pm8001_init.c | 57 ++++++++--------
drivers/scsi/pm8001/pm8001_sas.h | 2 +-
drivers/scsi/pmcraid.c | 75 ++++++++++-----------
drivers/scsi/pmcraid.h | 5 +-
31 files changed, 249 insertions(+), 251 deletions(-)
--
2.17.1
