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authorLarry Finger <Larry.Finger@lwfinger.net>2017-03-09 20:33:51 -0600
committerMichael Ellerman <mpe@ellerman.id.au>2017-03-10 14:17:23 +1100
commit46f401c4297a2232a037ad8801b6c83c90414cf7 (patch)
tree80cd6f33657f4303a9ae024bd3af81e0d882c335 /mm/msync.c
parentdb08e1d53034a54fe177ced70476fda73954b9e9 (diff)
downloadlinux-46f401c4297a2232a037ad8801b6c83c90414cf7.tar.bz2
powerpc/pmac: Fix crash in dma-mapping.h with NULL dma_ops
Commit 5657933dbb6e ("treewide: Move dma_ops from struct dev_archdata into struct device") introduced a crash for macio devices, an example backtrace being: kernel BUG at ./include/linux/dma-mapping.h:465! Oops: Exception in kernel mode, sig: 5 [#1] ... NIP [c031ddb0] dmam_alloc_coherent+0x74/0x140 LR [c031de70] dmam_alloc_coherent+0x134/0x140 Call Trace: dmam_alloc_coherent+0x134/0x140 (unreliable) pata_macio_port_start+0x3c/0x8c ata_host_start.part.5+0xfc/0x208 ata_host_activate+0x128/0x154 pata_macio_common_init+0x2f0/0x538 pata_macio_attach+0xd8/0x180 macio_device_probe+0x5c/0xec driver_probe_device+0x21c/0x314 __driver_attach+0xcc/0xd0 bus_for_each_dev+0x68/0xb4 bus_add_driver+0x1dc/0x244 driver_register+0x88/0x130 pata_macio_init+0x5c/0x88 do_one_initcall+0x40/0x170 kernel_init_freeable+0x134/0x1d0 kernel_init+0x18/0x110 ret_from_kernel_thread+0x5c/0x64 This was caused by the device having NULL dma_ops, triggering the BUG_ON(). Previously the device inherited its dma_ops via the assignment to dev->ofdev.dev.archdata. However after commit 5657933dbb6e the dma_ops are moved into dev->ofdev.dev, and so they need to be explicitly copied. Fixes: 5657933dbb6e ("treewide: Move dma_ops from struct dev_archdata into struct device") Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [mpe: Rewrite change log, add backtrace] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'mm/msync.c')
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