[etherlab-users] Hotplug

[Frank Werner]

 Hello,

 I like to support hotplugging in my kernel module. My kernel module is 
 based on the mini.c example from EtherCAT 1.5.0.

 To add or remove the slaves after hot plugging I habe to first 
 deactivate the master, second config the master and last activate the 
 master. Is that right?

 When I try to deactivate the master inside the cycle function (see 
 mini.c) the kernel shows me the folliwing warning:

 Apr 18 13:00:27 gomera0 kernel: EtherCAT 0: Domain 0: Working counter 
 changed to 1/2.
 Apr 18 13:00:27 gomera0 kernel: EtherCAT 0: 3 slave(s) responding.
 Apr 18 13:00:27 gomera0 kernel: EtherCAT 0: Scanning bus.
 Apr 18 13:00:27 gomera0 kernel: ec_control: DEBUG1: 
 ec_control_deactivate_master()
 Apr 18 13:00:27 gomera0 kernel: BUG: scheduling while atomic: 
 EtherCAT-OP/0x00000100/3181
 Apr 18 13:00:27 gomera0 kernel:  [<c02ab176>] 
 __sched_text_start+0x56/0x4ea
 Apr 18 13:00:27 gomera0 kernel:  [<f8b9708d>] ec_control_cycle+0x0/0xac 
 [ec_control]
 Apr 18 13:00:27 gomera0 kernel:  [<f8817c74>] e100_exec_cb+0x91/0xe4 
 [ec_e100]
 Apr 18 13:00:27 gomera0 kernel:  [<f8817219>] 
 e100_xmit_prepare+0x0/0x98 [ec_e100]
 Apr 18 13:00:27 gomera0 kernel:  [<c02ab734>] 
 wait_for_completion+0x55/0x7e
 Apr 18 13:00:27 gomera0 kernel:  [<c01107b9>] 
 default_wake_function+0x0/0xc
 Apr 18 13:00:27 gomera0 kernel:  [<f8b9708d>] ec_control_cycle+0x0/0xac 
 [ec_control]
 Apr 18 13:00:27 gomera0 kernel:  [<c0120b62>] kthread_stop+0x4c/0x6a
 Apr 18 13:00:27 gomera0 kernel:  [<f885e146>] 
 ec_master_thread_stop+0x51/0x89 [ec_master]
 Apr 18 13:00:27 gomera0 kernel:  [<f885e8b8>] 
 ecrt_master_deactivate+0x5e/0x179 [ec_master]
 Apr 18 13:00:27 gomera0 kernel:  [<f8b9708d>] ec_control_cycle+0x0/0xac 
 [ec_control]
 Apr 18 13:00:27 gomera0 kernel:  [<c01134b0>] printk+0x1b/0x1f
 Apr 18 13:00:27 gomera0 kernel:  [<f8b9708d>] ec_control_cycle+0x0/0xac 
 [ec_control]
 Apr 18 13:00:27 gomera0 kernel:  [<f8b95104>] 
 ec_control_deactivate_master+0x2a/0x34 [ec_control]
 Apr 18 13:00:27 gomera0 kernel:  [<f8b96e12>] 
 ec_control_check_master_state+0x82/0xcf [ec_control]
 Apr 18 13:00:27 gomera0 kernel:  [<f8b97126>] 
 ec_control_cycle+0x99/0xac [ec_control]
 Apr 18 13:00:27 gomera0 kernel:  [<c01192a4>] 
 run_timer_softirq+0xe0/0x12f
 Apr 18 13:00:27 gomera0 kernel:  [<c0116500>] __do_softirq+0x35/0x75
 Apr 18 13:00:27 gomera0 kernel:  [<c0116562>] do_softirq+0x22/0x26
 Apr 18 13:00:27 gomera0 kernel:  [<c0104a0a>] do_IRQ+0x61/0x73
 Apr 18 13:00:27 gomera0 kernel:  [<c01030a3>] 
 common_interrupt+0x23/0x28
 Apr 18 13:00:27 gomera0 kernel:  [<f885045e>] 
 ec_datagram_output_stats+0x5a/0x5f [ec_master]
 Apr 18 13:00:27 gomera0 kernel:  [<f885f200>] 
 ec_master_operation_thread+0x4c/0x128 [ec_master]
 Apr 18 13:00:27 gomera0 kernel:  [<f885f1b4>] 
 ec_master_operation_thread+0x0/0x128 [ec_master]
 Apr 18 13:00:27 gomera0 kernel:  [<f885f1b4>] 
 ec_master_operation_thread+0x0/0x128 [ec_master]
 Apr 18 13:00:27 gomera0 kernel:  [<c0120d0c>] kthread+0xa0/0xc8
 Apr 18 13:00:27 gomera0 kernel:  [<c0120c6c>] kthread+0x0/0xc8
 Apr 18 13:00:27 gomera0 kernel:  [<c0103223>] 
 kernel_thread_helper+0x7/0x10
 Apr 18 13:00:27 gomera0 kernel:  =======================

 What's the right way to implement hotplugging to my kernel module?

 Thanks,
 -Frank-