On 28 May 2007, at 12:51, Kay Sievers wrote:I don't believe that it is impossible. What is needed is some thought, and maybe a loose spec. We need to think about safe ways of solving a simple problem: what to do when userspace is unable to respond to a kernel uevent request. We now have a timeout, whether it be handled synchronously or in the background. I don't think either solution is good enough. [RFC] Possible Plan: 1) request_firmware() should stick around unmodified but be marked __deprecated. 2) request_firmware_nowait() as it stands should probably be removed. After all, it only has 2 in-kernel users at the moment. 3) uevent interface should be notified when userspace handlers are / are not available so that events can be queued to be handled when userspace does turn up and re-register a hotplug event handler. 4) request_firmware_async() introduced: asynchronous firmware loading interface built on basis of 3, such that problems at early boot and suspend / resume are avoided. Also request_firmware_async() taught to retain firmware in memory by default such that subsequent calls do not require a call to userspace if userspace is unavailable. 6) Documentation on correct firmware loading behaviour for driver authors written, together with migration notes for existing users of request_firmware(). 7) Existing uses of request_firmware() converted. *Grumble ahead* Unfortunately, I don't properly understand the uevent interface, so some of the above may be inaccurate. This is *not* my fault as there is no decent documentation (and btw, telling me to write the documentation is not the answer to that problem). Michael-Luke -
| Heiko Carstens | [patch -mm] s390: struct bin_attribute changes |
| Andrew Morton | 2.6.25-rc2-mm1 |
| Eric W. Biederman | Re: [PATCH] kexec: force x86_64 arches to boot kdump kernels on boot cpu |
| Jan Engelhardt | intel iommu (Re: -mm merge plans for 2.6.23) |
git: | |
| Jarek Poplawski | [PATCH] pkt_sched: Destroy gen estimators under rtnl_lock(). |
| Gerrit Renker | [PATCH 27/37] dccp: Integration of dynamic feature activation - part 2 (server side) |
| Jens Axboe | Re: [BUG] New Kernel Bugs |
| Andrew Morton | Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes |
