Le 27/10/2016 à 09:22, Steve Bennett a écrit : > Hi, > > We are seeing the following problem in the cadence macb driver. > > BUG: scheduling while atomic: kworker/0:1/44/0x00000002 > Modules linked in: 8021q of_serial beacon_sigproc io_processor emsattr > ems_dma_fifo xaxi_dma libgpioreg leds_gpio > CPU: 0 PID: 44 Comm: kworker/0:1 Not tainted 4.4.0 #1 > Hardware name: Xilinx Zynq Platform > Workqueue: events macb_tx_error_task > [<c0016a18>] (unwind_backtrace) from [<c0012ad4>] (show_stack+0x10/0x14) > [<c0012ad4>] (show_stack) from [<c01b089c>] (dump_stack+0x88/0xd8) > [<c01b089c>] (dump_stack) from [<c008e94c>] (__schedule_bug+0x48/0x60) > [<c008e94c>] (__schedule_bug) from [<c03592d4>] (__schedule+0x80/0x4c4) > [<c03592d4>] (__schedule) from [<c0359968>] (schedule+0xac/0xd4) > [<c0359968>] (schedule) from [<c035c284>] > (schedule_hrtimeout_range_clock+0xc0/0xf4) > [<c035c284>] (schedule_hrtimeout_range_clock) from [<c035bebc>] > (usleep_range+0x44/0x48) > [<c035bebc>] (usleep_range) from [<c025ec48>] (macb_tx_error_task+0xa0/0x270) > [<c025ec48>] (macb_tx_error_task) from [<c0035b6c>] > (process_one_work+0x1b8/0x2f0) > [<c0035b6c>] (process_one_work) from [<c0035fb4>] (worker_thread+0x2e4/0x3f0) > [<c0035fb4>] (worker_thread) from [<c003ac94>] (kthread+0xdc/0xf0) > [<c003ac94>] (kthread) from [<c000f698>] (ret_from_fork+0x14/0x3c) > > Here we are running at 10M half duplex, so tx is slow. > The problem was introduced in e4bfd971b where a spinlock is taken before
I can't find this commit ID. Can you please give the one on Linus' tree together with the commit subject? Thanks, > calling macb_halt_tx() which may then sleep waiting for the current packet to > finish > transmitting. > > We don't need the spinlock on our platform since we don't have multiple > queues, but > this should be fixed properly in the general case. > > Cheers, > Steve > > -- > µWeb: Embedded Web Framework - http://uweb.workware.net.au/ > WorkWare Systems Pty Ltd > W: www.workware.net.au P: +61 434 921 300 > E: ste...@workware.net.au > > > > > > -- Nicolas Ferre
