Jim Ramsay wrote:
On 8/23/05, Jim Ramsay <jim.ramsay@xxxxxxxxx> wrote:
Then I must have found an undocumented feature! I've applied this set
of patches to a 2.6.11 kernel (with few problems) and ran into a bunch
of "scheduling while atomic" errors when hotplugging a drive, culprit
being probably scsi_sysfs.c where scsi_remove_device locks a mutex, or
perhaps when it then calls class_device_unregister, which does a
'down_write'.
After further debugging, it appears that the problem is the debounce
timer in libata-core.c.
Timers appear to operate in an atomic context, so timers should not be
allowed to call scsi_remove_device, which eventually schedules.
Any suggestions on the best way to fix this?
Workqueue, perhaps.
--
George Anzinger george@xxxxxxxxxx
HRT (High-res-timers): http://sourceforge.net/projects/high-res-timers/
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