linux-kernel - Re: [PATCH v3 0/4] scsi: add runtime PM workaround for SD cardreaders

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Message-ID: <20210328145823.GA902609@rowland.harvard.edu>
Date:   Sun, 28 Mar 2021 10:58:23 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>
Cc:     bvanassche@....org, jejb@...ux.ibm.com,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-pm@...r.kernel.org, martin.petersen@...cle.com
Subject: Re: [PATCH v3 0/4] scsi: add runtime PM workaround for SD cardreaders

On Sun, Mar 28, 2021 at 12:25:27PM +0200, Martin Kepplinger wrote:
> hi,
> 
> In short: there are SD cardreaders that send MEDIA_CHANGED on
> (runtime) resume. We cannot use runtime PM with these devices as
> I/O always fails. I'd like to discuss a way to fix this
> or at least allow us to work around this problem:

In fact, as far as I know _all_ USB SD card readers send Media Changed 
notifications on resume.  Maybe there are some that don't, but I haven't 
heard of any.

Alan Stern