iommu/of: Ignore all errors except EPROBE_DEFER
authorSricharan R <sricharan@codeaurora.org>
Sat, 27 May 2017 13:47:41 +0000 (19:17 +0530)
committerJoerg Roedel <jroedel@suse.de>
Tue, 30 May 2017 09:31:32 +0000 (11:31 +0200)
commita37b19a384914c60b7e1264a6c21e7bf96b637e8
tree11bdf5b0e3e0a36665034422441fc2ecbbc512ca
parent573d41757c47cb71cd572236685d4c9e6cacc06c
iommu/of: Ignore all errors except EPROBE_DEFER

While deferring the probe of IOMMU masters, xlate and
add_device callbacks called from of_iommu_configure
can pass back error values like -ENODEV, which means
the IOMMU cannot be connected with that master for real
reasons. Before the IOMMU probe deferral, all such errors
were ignored. Now all those errors are propagated back,
killing the master's probe for such errors. Instead ignore
all the errors except EPROBE_DEFER, which is the only one
of concern and let the master work without IOMMU, thus
restoring the old behavior. Also make explicit that
of_dma_configure handles only -EPROBE_DEFER from
of_iommu_configure.

Fixes: 7b07cbefb68d ("iommu: of: Handle IOMMU lookup failure with deferred probing or error")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Magnus Damn <magnus.damn@gmail.com>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
drivers/iommu/of_iommu.c
drivers/of/device.c