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DATA_OVER(the same for RI/TI of IDMAC) interrupt may come up together with data error interrupts. If so, the interrupt routine set EVENT_DATA_ERR to the pending_events and schedule the tasklet but we may still fallback to the IDMAC interrupt case as the tasklet may come up a little late, namely right after the IDMAC interrupt checking. This will casue dw_mmc unmap sg twice. We can easily see it with CONFIG_DMA_API_DEBUG enabled. WARNING: CPU: 0 PID: 0 at lib/dma-debug.c:1096 check_unmap+0x7bc/0xb38 dwmmc_exynos 12200000.mmc: DMA-API: device driver tries to free DMA memory it has not allocated [device address=0x000000006d9d2200] [size=128 bytes] Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.7.0-rc4 #26 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [<c0112b4c>] (unwind_backtrace) from [<c010d888>] (show_stack+0x20/0x24) [<c010d888>] (show_stack) from [<c03fab0c>] (dump_stack+0x80/0x94) [<c03fab0c>] (dump_stack) from [<c0123548>] (__warn+0xf8/0x110) [<c0123548>] (__warn) from [<c01235a8>] (warn_slowpath_fmt+0x48/0x50) [<c01235a8>] (warn_slowpath_fmt) from [<c042ac90>] (check_unmap+0x7bc/0xb38) [<c042ac90>] (check_unmap) from [<c042b25c>] (debug_dma_unmap_sg+0x118/0x148) [<c042b25c>] (debug_dma_unmap_sg) from [<c077512c>] (dw_mci_dma_cleanup+0x7c/0xb8) [<c077512c>] (dw_mci_dma_cleanup) from [<c0773f24>] (dw_mci_stop_dma+0x40/0x50) [<c0773f24>] (dw_mci_stop_dma) from [<c0777d04>] (dw_mci_tasklet_func+0x130/0x3b4) [<c0777d04>] (dw_mci_tasklet_func) from [<c0129760>] (tasklet_action+0xb4/0x150) ..[snip].. ---[ end trace 256f83eed365daf0 ]--- Reported-by: Seung-Woo Kim <sw0312.kim@samsung.com> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> |
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