linux-kernel - Re: [PATCH v4 1/1] scsi: ufs: core: add device level exception support

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Message-ID: <ad246ef4-7429-63bb-0279-90738736f6e3@quicinc.com>
Date: Wed, 26 Mar 2025 16:47:14 -0700
From: "Bao D. Nguyen" <quic_nguyenb@...cinc.com>
To: Bart Van Assche <bvanassche@....org>,
        Arthur Simchaev
	<Arthur.Simchaev@...disk.com>,
        "quic_cang@...cinc.com"
	<quic_cang@...cinc.com>,
        "quic_nitirawa@...cinc.com"
	<quic_nitirawa@...cinc.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "peter.wang@...iatek.com" <peter.wang@...iatek.com>,
        "manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>,
        "minwoo.im@...sung.com" <minwoo.im@...sung.com>,
        "adrian.hunter@...el.com"
	<adrian.hunter@...el.com>,
        "martin.petersen@...cle.com"
	<martin.petersen@...cle.com>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        Alim Akhtar
	<alim.akhtar@...sung.com>,
        "James E.J. Bottomley"
	<James.Bottomley@...senPartnership.com>,
        Matthias Brugger
	<matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>,
        Bean Huo <beanhuo@...ron.com>,
        Keoseong Park <keosung.park@...sung.com>,
        Ziqi Chen
	<quic_ziqichen@...cinc.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        "Gwendal
 Grignou" <gwendal@...omium.org>,
        Eric Biggers <ebiggers@...gle.com>,
        open
 list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC
 support:Keyword:mediatek" <linux-arm-kernel@...ts.infradead.org>,
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	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v4 1/1] scsi: ufs: core: add device level exception
 support

On 3/26/2025 3:49 AM, Bart Van Assche wrote:
> On 3/25/25 6:15 PM, Bao D. Nguyen wrote:
>> The existing "struct utp_upiu_query_v4_0" probably has a bug in it. It 
>> does not use the  __attribute__((__packed__)) attribute. The compiler 
>> is free to add padding in this structure, resulting in the read 
>> attribute value being incorrect. I plan to provide a separate patch to 
>> fix this issue.
> 
> Adding __attribute__((__packed__)) or __packed to data structures that
> don't need it is not an improvement but is a change that makes
> processing slower on architectures that do not support unaligned
> accesses. Instead of adding __packed to data structures in their
> entirety, only add it to those members that need it and check the
> structure size as follows:
> 
> static_assert(sizeof(...) == ...);
> 
Thank you for the info on this, Bart.
IMO, this response upiu data should be __packed because the data coming 
from the hardware follows a strict format as defined by the spec. If we 
support __pack each individual field which data may be read by the 
driver (the attribute read commands) and check the validity of their 
sizes, it may add some complexity?

Thanks, Bao