From: Oded Gabbay Date: Mon, 10 Nov 2014 08:57:36 +0000 (+0200) Subject: iommu/amd: fix accounting of device_state X-Git-Tag: omap-for-v3.19/fixes-rc1~80^2~36^2~24 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a015c1e92639cd65ebb49350abdf5ad15bce4448;p=pandora-kernel.git iommu/amd: fix accounting of device_state This patch fixes a bug in the accounting of the device_state. In the current code, the device_state was put (decremented) too many times, which sometimes lead to the driver getting stuck permanently in put_device_state_wait(). That happen because the device_state->count would go below zero, which is never supposed to happen. The root cause is that the device_state was decremented in put_pasid_state() and put_pasid_state_wait() but also in all the functions that call those functions. Therefore, the device_state was decremented twice in each of these code paths. The fix is to decouple the device_state accounting from the pasid_state accounting - remove the call to put_device_state() from the put_pasid_state() and the put_pasid_state_wait()) Signed-off-by: Oded Gabbay --- Reading git-diff-tree failed