linux-kernel - RE: [PATCH v4 4/6] iommu: Regulate EINVAL in ->attach

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Date:   Thu, 22 Sep 2022 08:18:21 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "yong.wu@...iatek.com" <yong.wu@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
CC:     "jgg@...dia.com" <jgg@...dia.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v4 4/6] iommu: Regulate EINVAL in ->attach_dev callback
 functions

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Wednesday, September 21, 2022 4:23 PM
> 
> Following the new rules in include/linux/iommu.h kdocs, EINVAL now can be
> used to indicate that domain and device are incompatible by a caller that
> treats it as a soft failure and tries attaching to another domain.
> 
> On the other hand, there are ->attach_dev callback functions returning it
> for obvious device-specific errors. They will result in some inefficiency
> in the caller handling routine.
> 
> Update these places to corresponding errnos following the new rules.
> 
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>