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由 Finn Thain 提交于
Linux v2.1.105 changed the algorithm for polling for the BSY signal in NCR5380_select() and NCR5380_main(). Presently, this code has a bug. Back then, NCR5380_set_timer(hostdata, 1) meant reschedule main() after sleeping for 10 ms. Repeated 25 times this provided the recommended 250 ms selection time-out delay. This got broken when HZ became configurable. We could fix this but there's no need to reschedule the main loop. This BSY polling presently happens when the NCR5380_main() work queue item calls NCR5380_select(), which in turn schedules NCR5380_main(), which calls NCR5380_select() again, and so on. This algorithm is a deviation from the simpler one in atari_NCR5380.c. The extra complexity and state is pointless. There's no reason to stop selection half-way and return to to the main loop when the main loop can do nothing useful until selection completes. So just poll for BSY. We can sleep while polling now that we have a suitable workqueue. Signed-off-by: NFinn Thain <fthain@telegraphics.com.au> Reviewed-by: NHannes Reinecke <hare@suse.com> Tested-by: NOndrej Zary <linux@rainbow-software.org> Tested-by: NMichael Schmitz <schmitzmic@gmail.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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