From: Oded Gabbay <oded.gabbay@amd.com>
Date: Mon, 17 Nov 2014 11:18:32 +0000 (+0200)
Subject: amdkfd: use schedule() in sync_with_hw
X-Git-Tag: omap-for-v3.19/fixes-rc1~80^2~22^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9a5634a72934a566b3e5fdb0e8f345846162f7d3;p=pandora-kernel.git

amdkfd: use schedule() in sync_with_hw

amdkfd uses cpu_relax() in its sync_with_hw() function. Because cpu_relax() is
defined as 'REP; NOP' on x86_64, it will block the CPU from servicing
IOMMU PPR requests.

This may cause a deadlock, because sync_with_hw() won't be completed
until the PPR request has been served.

Therefore, we need to use schedule() instead of cpu_relax() as it is the
minimum requirement to allow other threads to execute.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
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