linux-kernel - Re: [PATCH v2 3/6] scsi: pm8001: Remove pm8001_tag

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Message-ID: <1719c2ee-cf05-0885-38a8-7d1176020731@suse.de>
Date:   Tue, 4 Oct 2022 07:50:58 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     John Garry <john.garry@...wei.com>, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, jinpu.wang@...ud.ionos.com,
        damien.lemoal@....com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com, ipylypiv@...gle.com, changyuanl@...gle.com,
        hch@....de, yanaijie@...wei.com
Subject: Re: [PATCH v2 3/6] scsi: pm8001: Remove pm8001_tag_init()

On 9/30/22 10:56, John Garry wrote:
> From: Igor Pylypiv <ipylypiv@...gle.com>
> 
> In commit 5a141315ed7c ("scsi: pm80xx: Increase the number of outstanding
> I/O supported to 1024") the pm8001_ha->tags allocation was moved into
> pm8001_init_ccb_tag(). This changed the execution order of allocation.
> pm8001_tag_init() used to be called after the pm8001_ha->tags allocation
> and now it is called before the allocation.
> 
> Before:
> 
> pm8001_pci_probe()
> `--> pm8001_pci_alloc()
>       `--> pm8001_alloc()
>            `--> pm8001_ha->tags = kzalloc(...)
>            `--> pm8001_tag_init(pm8001_ha); // OK: tags are allocated
> 
> After:
> 
> pm8001_pci_probe()
> `--> pm8001_pci_alloc()
> |    `--> pm8001_alloc()
> |         `--> pm8001_tag_init(pm8001_ha); // NOK: tags are not allocated
> |
> `--> pm8001_init_ccb_tag()
>       `-->  pm8001_ha->tags = kzalloc(...) // today it is bitmap_zalloc()
> 
> Since pm8001_ha->tags_num is zero when pm8001_tag_init() is called it does
> nothing. Tags memory is allocated with bitmap_zalloc() so there is no need
> to manually clear each bit with pm8001_tag_free().
> 
> Reviewed-by: Changyuan Lyu <changyuanl@...gle.com>
> Signed-off-by: Igor Pylypiv <ipylypiv@...gle.com>
> Signed-off-by: John Garry <john.garry@...wei.com>
> Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
> ---
>   drivers/scsi/pm8001/pm8001_init.c | 2 --
>   drivers/scsi/pm8001/pm8001_sas.c  | 7 -------
>   drivers/scsi/pm8001/pm8001_sas.h  | 1 -
>   3 files changed, 10 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheerx,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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