George Anzinger wrote:
Jim Ramsay wrote:
On 8/23/05, Jim Ramsay <[email protected]> wrote:
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
...
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.
The USB and IEEE 1394 subsystems have kernel threads which manage node
additions and removals (usb/storage/usb.c, ieee1394/nodemgr.c). The add
and remove functions of their storage drivers are called from these
threads' non-atomic context. However if you don't need an own thread for
any further bus management purposes, a workqueue looks suitable for hot
plugging and unplugging.
--
Stefan Richter
-=====-=-=-= =--- ==---
http://arcgraph.de/sr/
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