On 2/19/19 1:02 PM, Sreekanth Reddy wrote:
Use driver's scsiio lookup table to track outstanding IOs at driver level,
Have done following changes in this patch,
* Allocated & initialized scsi_lookup table of type
(struct scsiio_tracker) and of depth host's can_queue at driver load time
and it will be deallocated at driver unload time.
* Once scmd is receieved, driver will take scsiio_tracker at entry
corresponding to scmd's tag value from scsi_lookup table. Then this
scsiio_tracker entry is initialized with proper smid, scmd, cb_idx etc.
And this scsiio_tracker entry contents are cleared before driver
calling scsi_done callback function.
* scmd's host_scribble variable is used to save the corresponding
scsiio_tracker address, later at any time driver can easily retrieve the
scmd's corresponding scsiio_tacker using this host_scribble variable.
* Whenever driver wants to get the outstanding IOs at the driver level
then driver can go through this scsi_lookup table and if it observe
any entry with non-null scmd then it means that scmd is outstanding
at the driver level.
Cc: <sta...@vger.kernel.org>
Signed-off-by: Sreekanth Reddy <sreekanth.re...@broadcom.com>
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What is the reason for this change?
The description only states _what_ you are doing, not why.
Care to elaborate?
Cheers,
Hannes
