On Wed, Jun 25, 2008 at 06:22:49PM +0400, Anton Vorontsov wrote: > On Wed, Jun 25, 2008 at 05:15:43PM +0400, Sergei Shtylyov wrote: > > Hello. > > > > Anton Vorontsov wrote: > > > >>>>> IDE interrupt handler relies on the fact that, if necessary, > >>>>> hardirqs will re-trigger on ISR exit. With fully preemtable IRQs > >>>>> this seems to be not true, since if hardirq thread is currently > >>>>> running, and the same IRQ raised again, then this IRQ will be > >>>>> simply lost. > > > >>>> actually no, that should not happen - if -rt loses an IRQ then > >>>> something broke in the threaded IRQ code. It's supposed to be a > >>>> drop-in, compatible IRQ flow with no driver changes needed. > > > >>> ..just as I thought, the bug somewhere deeper... heh. > > > >> Ok, a bit more investigation showed that this is indeed not RT specific > >> per see, but issue emerges only on RT-style IRQ handlers + alim15x3 IDE > >> controller (for example, PDC20269 works ok). > > > > Does it happen only with ATAPI devices also or with ATA disks too? > > So far I own two ATAPI devices, IDE disks are quire rare nowadays, > should find one. ;-) [...] > >> Also, further testing showed that this issue isn't drive-specific, i.e. > >> with a delay inserted before the unmask_irq(), the bug shows with any > >> drive I have. > > > > So, "shit happens" even with the ATA drives? > > Will try as soon as I'll get one. Thanks for the drive, and the result is: hda: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest } ide: failed opcode was: unknown -- Anton Vorontsov email: cbouatmailru@xxxxxxxxx irc://irc.freenode.net/bd2 -- 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