On Tue, 4 Mar 2008, David Brownell wrote: > > I don't understand this comment. Suppose a card was inserted while the > > system was hibernating. If the core didn't reprobe, when would that > > card be discovered? > > The host controller would tell the core to check for a card, exactly > like it does at all other times. But how would the host controller know to do that? Isn't card insertion detection often driven by interrupts? If a card is inserted while the computer is off, no interrupt will be generated. > That's the natural alternative to having the MMC core assume that card > detection was broken in low power states, so that the core needed to > forcibly remove the cards before suspend, and reprobe during resume > processing. Is that the assumption the MMC core was really making? Are you sure it wasn't assuming something else (perhaps equally as bad)? > Having the MMC core make such needless assumptions can cause problems > for the upper layers, including filesystems. What's wrong with a superfluous probe at resume time, besides the waste of a few milliseconds? Alan Stern _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
