Hi John, Antonio, Emmanuel found a race condition in rx buffer allocation/deallocation, and attached is a patch that fixes it. >> > since linux-3.0 (I don't remember if it was the case even before), >> > I'm getting this output in dmesg: >> > >> > [ 53.662990] ------------[ cut here ]------------ >> > [ 53.663016] WARNING: at drivers/iommu/intel-iommu.c:2911 >> > intel_unmap_page+0x14b/0x180() >> > [ 53.663047] Hardware name: Latitude E5420 >> > [ 53.663066] Driver unmaps unmatched page at PFN ffd1a000 >> >> >> I see that I always get the same addr passed to the unmap function: >> >> [ 23.950535] Driver unmaps unmatched page at PFN ffd1a000 >> >> is it a coincidence? >> I'm running linux-3.3.3 right now. I can try wireless-testing if it would help. [MV] Antonio -- can you try out the patch attached and let us know if you continue to see the problem? >Just for the record, we are seeing a similar problem on RHEL 6.3 (which has an >iwlwifi driver derived from linux-3.2). > > https://bugzilla.redhat.com/show_bug.cgi?id=815998 [MV] John -- I'll update the redhat bugzilla as well. Thanks Meenakshi
Attachment:
0001-iwlwifi-fix-a-potential-race-in-receive-buffer-alloc.patch
Description: 0001-iwlwifi-fix-a-potential-race-in-receive-buffer-alloc.patch
