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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Ivo Totev, Andrew
Myers, Andrew McDonald, Martje Boudien Moerman