linux-block.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Eric Biggers <ebiggers@kernel.org>
To: Satya Tangirala <satyaprateek2357@gmail.com>
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	Jens Axboe <axboe@kernel.dk>, Satya Tangirala <satyat@google.com>
Subject: Re: [PATCH v4 5/9] ufshcd: handle error from blk_ksm_register()
Date: Fri, 23 Jul 2021 10:13:29 -0700	[thread overview]
Message-ID: <YPr4ubrFPQ1Pd5mE@gmail.com> (raw)
In-Reply-To: <20210707052943.3960-6-satyaprateek2357@gmail.com>

On Tue, Jul 06, 2021 at 10:29:39PM -0700, Satya Tangirala wrote:
> From: Satya Tangirala <satyat@google.com>
> 
> Handle any error from blk_ksm_register() in the callers. Previously,
> the callers ignored the return value because blk_ksm_register() wouldn't
> fail as long as the request_queue didn't have integrity support too, but
> as this is no longer the case, it's safer for the callers to just handle
> the return value appropriately.
> 
> Signed-off-by: Satya Tangirala <satyat@google.com>
> ---
>  drivers/scsi/ufs/ufshcd-crypto.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd-crypto.c b/drivers/scsi/ufs/ufshcd-crypto.c
> index d70cdcd35e43..0fcf9d6752f8 100644
> --- a/drivers/scsi/ufs/ufshcd-crypto.c
> +++ b/drivers/scsi/ufs/ufshcd-crypto.c
> @@ -233,6 +233,15 @@ void ufshcd_init_crypto(struct ufs_hba *hba)
>  void ufshcd_crypto_setup_rq_keyslot_manager(struct ufs_hba *hba,
>  					    struct request_queue *q)
>  {
> -	if (hba->caps & UFSHCD_CAP_CRYPTO)
> -		blk_ksm_register(&hba->ksm, q);
> +	if (hba->caps & UFSHCD_CAP_CRYPTO) {
> +		/*
> +		 * This WARN_ON should never trigger since &hba->ksm won't be
> +		 * "empty" (i.e. will support at least 1 crypto capability), a
> +		 * UFS device's request queue doesn't support integrity, and
> +		 * it also satisfies all the block layer constraints (i.e.
> +		 * supports SG gaps, doesn't have chunk sectors, has a
> +		 * sufficiently large supported max_segments per bio)
> +		 */
> +		WARN_ON(!blk_ksm_register(&hba->ksm, q));
> +	}

I guess this looks okay, but I think the comment should be a bit more concise
and not so tied to the current implementation details, like:

                /*
                 * This WARN_ON should never trigger since at least one of the
                 * declared crypto capabilities should be compatible with the
                 * UFS device, otherwise the UFS host driver shouldn't have
                 * declared crypto support at all.
                 */

Likewise for the similar MMC crypto patch.

- Eric

  reply	other threads:[~2021-07-23 17:13 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-07  5:29 [PATCH v4 0/9] ensure bios aren't split in middle of crypto data unit Satya Tangirala
2021-07-07  5:29 ` [PATCH v4 1/9] block: introduce blk_ksm_is_empty() Satya Tangirala
2021-07-23 16:45   ` Eric Biggers
2021-07-07  5:29 ` [PATCH v4 2/9] block: blk-crypto: introduce blk_crypto_bio_sectors_alignment() Satya Tangirala
2021-07-23 16:45   ` Eric Biggers
2021-07-07  5:29 ` [PATCH v4 3/9] block: introduce bio_required_sector_alignment() Satya Tangirala
2021-07-23 16:46   ` Eric Biggers
2021-07-07  5:29 ` [PATCH v4 4/9] block: keyslot-manager: introduce blk_ksm_restrict_dus_to_queue_limits() Satya Tangirala
2021-07-23 17:08   ` Eric Biggers
2021-07-07  5:29 ` [PATCH v4 5/9] ufshcd: handle error from blk_ksm_register() Satya Tangirala
2021-07-23 17:13   ` Eric Biggers [this message]
2021-07-07  5:29 ` [PATCH v4 6/9] mmc: " Satya Tangirala
2021-07-07  5:29 ` [PATCH v4 7/9] dm: " Satya Tangirala
2021-07-23 17:26   ` Eric Biggers
2021-07-07  5:29 ` [PATCH v4 8/9] blk-merge: Ensure bios aren't split in middle of a crypto data unit Satya Tangirala
2021-07-23 18:11   ` Eric Biggers
2021-07-07  5:29 ` [PATCH v4 9/9] block: add WARN_ON_ONCE() to bio_split() for sector alignment Satya Tangirala
2021-07-23 17:30   ` Eric Biggers
2021-07-23 16:49 ` [PATCH v4 0/9] ensure bios aren't split in middle of crypto data unit Eric Biggers
2021-07-23 17:52   ` Eric Biggers
2021-07-24  7:36 ` Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YPr4ubrFPQ1Pd5mE@gmail.com \
    --to=ebiggers@kernel.org \
    --cc=axboe@kernel.dk \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=satyaprateek2357@gmail.com \
    --cc=satyat@google.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).