On Friday, July 29, 2016 03:58:20 AM Zheng, Lv wrote: > Hi, Rafael > > > From: Zheng, Lv > > Subject: [PATCH] ACPI / EC: Fix a regression by reducing parallel _Qxx > > evaluations > > > > A regression is caused by the following commit: > > Commit: 02b771b64b73226052d6e731a0987db3b47281e9 > > Subject: ACPI / EC: Fix an issue caused by the serialized _Qxx evaluations > > In this commit, using system workqueue causes that the maximum parallel > > executions of _Qxx can exceed 255. This violates the method reentrancy > > limit in ACPICA and generates the following error log: > > ACPI Error: Method reached maximum reentrancy limit (255) > > (20150818/dsmethod-341) > > > > This patch creates a seperate workqueue and limits the number of parallel > > _Qxx evaluations down to a configurable value (can be tuned against > > number > > of online CPUs). > > > > Since EC events are handled after driver probe, we can create the > > workqueue > > in acpi_ec_init(). > > > > Fixes: 02b771b64b73 (ACPI / EC: Fix an issue caused by the serialized _Qxx > > evaluations) > > Cc: <stable@xxxxxxxxxxxxxxx> # 4.3+ > > Reported-and-tested-by: Helen Buus <ubuntu@xxxxxxxxx> > [Lv Zheng] > I'm sorry that I forgot to mention the bug link. > It's actually recorded in kernel Bugzilla. > The bug can be found here: > Link: https://bugzilla.kernel.org/show_bug.cgi?id=135691 > Hope you can help to add this useful information if this patch is acceptable. I did that, but due to the problem reported against this patch (https://patchwork.kernel.org/patch/9252645/), I'm going to drop it from linux-next and I'll be waiting for an update with that problem addressed. Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
