On Sun, Oct 25, 2015 at 7:36 PM, Yin, Fengwei <fengwei.yin@xxxxxxxxxx> wrote: > arm64 has requirement that all the dma operations have actual device. > Otherwise, following warnning message shown and dma allocation fails: > > WARNING: CPU: 0 PID: 954 at arch/arm64/mm/dma-mapping.c:106 __dma_alloc+0x24c/0x258() > Use an actual device structure for DMA allocation > Modules linked in: wcn36xx wcn36xx_platform > CPU: 0 PID: 954 Comm: ifconfig Not tainted 4.0.0+ #14 > Hardware name: Qualcomm Technologies, Inc. MSM 8916 MTP (DT) > Call trace: > [<ffffffc000089904>] dump_backtrace+0x0/0x124 > [<ffffffc000089a38>] show_stack+0x10/0x1c > [<ffffffc000627114>] dump_stack+0x80/0xc4 > [<ffffffc0000b2e64>] warn_slowpath_common+0x98/0xd0 > [<ffffffc0000b2ee8>] warn_slowpath_fmt+0x4c/0x58 > [<ffffffc00009487c>] __dma_alloc+0x248/0x258 > [<ffffffbffc009270>] wcn36xx_dxe_allocate_mem_pools+0xc4/0x108 [wcn36xx] > [<ffffffbffc0079c4>] wcn36xx_start+0x38/0x240 [wcn36xx] > [<ffffffc0005f161c>] ieee80211_do_open+0x1b0/0x9a4 > [<ffffffc0005f1e68>] ieee80211_open+0x58/0x68 > [<ffffffc00051693c>] __dev_open+0xb0/0x120 > [<ffffffc000516c10>] __dev_change_flags+0x88/0x150 > [<ffffffc000516cf4>] dev_change_flags+0x1c/0x5c > [<ffffffc000570950>] devinet_ioctl+0x644/0x6f0 > > Signed-off-by: Yin, Fengwei <fengwei.yin@xxxxxxxxxx> Acked-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx> Regards, Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
