On Fri, May 06, 2016 at 05:01:13PM +0530, Sricharan R wrote: > With CONFIG_DEBUG_SG is enabled and when dma mode is used, below dump is seen, > > ------------[ cut here ]------------ > kernel BUG at include/linux/scatterlist.h:140! > Internal error: Oops - BUG: 0 [#1] PREEMPT SMP > Modules linked in: > CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.4.0-00459-g9f087b9-dirty #7 > Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) > task: ffffffc036868000 ti: ffffffc036870000 task.ti: ffffffc036870000 > PC is at qup_sg_set_buf.isra.13+0x138/0x154 > LR is at qup_sg_set_buf.isra.13+0x50/0x154 > pc : [<ffffffc0005a0ed8>] lr : [<ffffffc0005a0df0>] pstate: 60000145 > sp : ffffffc0368735c0 > x29: ffffffc0368735c0 x28: ffffffc036873752 > x27: ffffffc035233018 x26: ffffffc000c4e000 > x25: 0000000000000000 x24: 0000000000000004 > x23: 0000000000000000 x22: ffffffc035233668 > x21: ffffff80004e3000 x20: ffffffc0352e0018 > x19: 0000004000000000 x18: 0000000000000028 > x17: 0000000000000004 x16: ffffffc0017a39c8 > x15: 0000000000001cdf x14: ffffffc0019929d8 > x13: ffffffc0352e0018 x12: 0000000000000000 > x11: 0000000000000001 x10: 0000000000000001 > x9 : ffffffc0012b2d70 x8 : ffffff80004e3000 > x7 : 0000000000000018 x6 : 0000000030000000 > x5 : ffffffc00199f018 x4 : ffffffc035233018 > x3 : 0000000000000004 x2 : 00000000c0000000 > x1 : 0000000000000003 x0 : 0000000000000000 > > Process swapper/0 (pid: 1, stack limit = 0xffffffc036870020) > Stack: (0xffffffc0368735c0 to 0xffffffc036874000) > > Change allocation of sg buffers from dma_coherent memory to kzalloc > to fix the issue. This description describes what you do. But not why it is the correct solution to the OOPS. The OOPS neither describes it. Please add some more explanation. > > Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx> > Reviewed-by: Andy Gross <andy.gross@xxxxxxxxxx>
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