revision history ---------------- v2: * move module parameter to sd * add Documentation v1: https://lore.kernel.org/linux-scsi/20210111152029.28426-1-martin.kepplinger@xxxxxxx/T/#t 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 basically always fails. I'd like to discuss a way to fix this or at least allow users to work around this problem: For the full background, the discussion started in June 2020 here: https://lore.kernel.org/linux-scsi/20200623111018.31954-1-martin.kepplinger@xxxxxxx/ and I sent the first of these patches in August, as a reference: https://lore.kernel.org/linux-scsi/20200824190400.12339-1-martin.kepplinger@xxxxxxx/ so this is where I'm following up on. I'm not sure whether maintaining an in-kernel quirk for specific devices makes sense so here I suggest adding a userspace knob. This way there's at least a chance to use runtime PM for sd cardreaders that send MEDIA_CHANGED. I'd appreciate any feedback. Martin Kepplinger (3): scsi: add expecting_media_change flag to error path scsi: sd: add ignore_resume_medium_changed disk setting scsi: sd: Documentation: describe ignore_resume_medium_changed Documentation/scsi/sd-parameters.rst | 14 ++++++++ drivers/scsi/scsi_error.c | 36 +++++++++++++++++--- drivers/scsi/sd.c | 50 +++++++++++++++++++++++++++- drivers/scsi/sd.h | 1 + include/scsi/scsi_device.h | 1 + 5 files changed, 96 insertions(+), 6 deletions(-) -- 2.20.1
