On Mon, Oct 14, 2013 at 06:18:53PM +0200, Lukasz Dorau wrote: > If EM Transmit bit is busy during init ata_msleep() is called. > It is wrong - msleep() should be used instead of ata_msleep(), > because if EM Transmit bit is busy for one port, it will be busy > for all other ports too, so using ata_msleep() causes wasting > tries for another ports. > > The most common scenario looks like that now > (six ports try to transmit a LED meaasege): > - port #0 tries for the 1st time and succeeds > - ports #1-5 try for the 1st time and sleeps > - port #1 tries for the 2nd time and succeeds > - ports #2-5 try for the 2nd time and sleeps > - port #2 tries for the 3rd time and succeeds > - ports #3-5 try for the 3rd time and sleeps > - port #3 tries for the 4th time and succeeds > - ports #4-5 try for the 4th time and sleeps > - port #4 tries for the 5th time and succeeds > - port #5 tries for the 5th time and sleeps > At this moment port #5 wasted all its five tries and failed to initialize. > Because there are only 5 (EM_MAX_RETRY) tries available usually only five ports > succeed to initialize. The sixth port and next ones usually will fail. > > If msleep() is used instead of ata_msleep() the first port succeeds to initialize > in the first try and next ones usually succeed to initialize in the second try. > > Signed-off-by: Lukasz Dorau <lukasz.dorau@xxxxxxxxx> Applied to libata/for-3.12-fixes with minor updates. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
