Hi Sascha

On Mon, 2017-01-09 at 09:38 +0100, Sascha Hauer wrote:
> Hi Christoph,
> 
> On Wed, Dec 28, 2016 at 04:29:44PM +0100, Christoph Fritz wrote:
> > This patch increases delay time for slow hubs after device removal.
> 
> Could you spent a few words what happens without this patch, i.e. how
> the symptons look and which hardware you observed that? Without this
> information it will be very hard to ever change this line again.
> 
> Sascha
> 
> > 
> > Signed-off-by: Christoph Fritz <chf.fr...@googlemail.com>
> > ---
> >  drivers/usb/core/hub.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> > index f44aea5..0854e3a 100644
> > --- a/drivers/usb/core/hub.c
> > +++ b/drivers/usb/core/hub.c
> > @@ -201,7 +201,7 @@ static void usb_hub_port_connect_change(struct 
> > usb_device *dev, int port)
> >     if (dev->children[port] && !(portstatus & USB_PORT_STAT_ENABLE))
> >             usb_remove_device(dev->children[port]);
> >  
> > -   mdelay(200);
> > +   mdelay(500);
> >  
> >     /* Reset the port */
> >     if (hub_port_reset(dev, port, &portstatus) < 0) {
> > -- 
> > 2.1.4

While updating Barebox to a new version I stumbled upon this and did
some tests without the above patch applied:

# plug in a non certified USB device (which I suppose doesn't meet the init 
timing constrains,
# a certified one doesn't trigger the following error):

barebox:/ usb
usb: USB: scanning bus for devices...
usb: Bus 001 Device 001: ID 0000:0000 EHCI Host Controller
usb-hub usb1: hub_port_reset: resetting port 0...
usb-hub usb1: portstatus 503, change 10, 480 Mb/s
usb-hub usb1: STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  USB_PORT_STAT_ENABLE 1
usb-hub usb1: hub_port_reset: resetting port 0...
usb-hub usb1: portstatus 503, change 10, 480 Mb/s
usb-hub usb1: STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  USB_PORT_STAT_ENABLE 1
usb: Bus 001 Device 002: ID 04b4:6560
usb-hub usb1-0: hub_port_reset: resetting port 2...
usb-hub usb1-0: portstatus 103, change 10, 12 Mb/s
usb-hub usb1-0: STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  USB_PORT_STAT_ENABLE 
1
usb-hub usb1-0: hub_port_reset: resetting port 2...
usb-hub usb1-0: portstatus 103, change 10, 12 Mb/s
usb-hub usb1-0: STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  USB_PORT_STAT_ENABLE 
1
usb: Bus 001 Device 003: ID 10c4:ea60 CP2104 USB to UART Bridge Contr
usb: 3 USB Device(s) found

# now disconnect the USB device:

barebox:/ usb
usb: USB: scanning bus for devices...
usb1-0-0-2: removed
usb: 4 USB Device(s) found

# 4 USB Devices seems wrong, now connect the USB device again:

barebox@:/ usb
usb: USB: scanning bus for devices...
usb-hub usb1-0-0: hub_port_reset: resetting port 2...
usb-hub usb1-0-0: portstatus 103, change 10, 12 Mb/s
usb-hub usb1-0-0: STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  
USB_PORT_STAT_ENABLE 1
usb: 4 USB Device(s) found

# still 4 USB Devices found, ...?
# starting 'usb' again hits a NULL pointer dereference:

barebox@:/ usb
usb: USB: scanning bus for devices...
unable to handle NULL pointer dereference at address 0x00000004
pc : [<2fe1d432>]    lr : [<2fe1e24b>]
sp : 2ffefcb8  ip : 00000016  fp : 00000001
r10: 00000100  r9 : 00000001  r8 : 201836b4
r7 : 201836cc  r6 : 201859d0  r5 : 201859f4  r4 : 20184ee4
r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 : 201859f4
Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
[<2fe1d432>] (usb_remove_device+0x4e/0x98) from [<2fe1e24b>] 
(usb_hub_detect+0x97/0x1bc)
[<2fe1e24b>] (usb_hub_detect+0x97/0x1bc) from [<2fe1e361>] 
(usb_hub_detect+0x1ad/0x1bc)

[<2fe4e855>] (unwind_backtrace+0x1/0x58) from [<2fe00b65>] (panic+0x1d/0x2c)
[<2fe00b65>] (panic+0x1d/0x2c) from [<2fe4ccd1>] (do_exception+0xd/0x10)
[<2fe4ccd1>] (do_exception+0xd/0x10) from [<2fe4cd31>] (do_data_abort+0x21/0x2c)
[<2fe4cd31>] (do_data_abort+0x21/0x2c) from [<2fe4c474>] (do_abort_6+0x48/0x54)
[<2fe4c474>] (do_abort_6+0x48/0x54) from [<00000000>] (0x0)

----

# on another hardware with a bit more debug output:
# just reset board, plug in USB device and start 'usb':

barebox@:/ usb
usb: USB: scanning bus for devices...
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0 
length 0x40
usb: set address 1
usb: usb_control_msg: request: 0x5, requesttype: 0x0, value 0x1 index 0x0 
length 0x0
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0 
length 0x12
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0 
length 0x9
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0 
length 0x19
usb: get_conf_no 0 Result 25, wLength 25
usb: if 0, ep 0
usb: ##EP epmaxpacketin[1] = 2
usb: set configuration 1
usb: usb_control_msg: request: 0x9, requesttype: 0x0, value 0x1 index 0x0 
length 0x0
usb: new device: Mfr=1, Product=2, SerialNumber=0
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x300 index 0x0 
length 0xFF
usb: USB device number 1 default language ID 0x1
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x301 index 0x1 
length 0xFF
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x302 index 0x1 
length 0xFF
usb: Bus 001 Device 001: ID 0000:0000 EHCI Host Controller
usb: matching: 0x0000 0x0000
usb: matching: 0x0000 0x0000
usb: matching: 0x0000 0x0000
usb: match: 0x0000 0x0000
usb: usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index 0x0 
length 0x4
usb: usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index 0x0 
length 0x9
usb-hub usb1: 1 ports detected
usb-hub usb1: individual port power switching
usb-hub usb1: standalone hub
usb-hub usb1: global over-current protection
usb-hub usb1: power on to power good time: 20ms
usb-hub usb1: hub controller current requirement: 0mA
usb-hub usb1: port 1 is removable
usb: usb_control_msg: request: 0x0, requesttype: 0xA0, value 0x0 index 0x0 
length 0x4
usb-hub usb1: get_hub_status returned status 1, change 8101
usb-hub usb1: local power source is lost (inactive)
usb-hub usb1: no over-current condition exists
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x8 index 0x1 
length 0x0
usb-hub usb1: port 1 returns 0
usb-hub usb1: enabling power on all ports
usb: usb_control_msg: request: 0x3, requesttype: 0x23, value 0x8 index 0x1 
length 0x0
usb-hub usb1: port 1 returns 0
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 
length 0x4
usb-hub usb1: Port 1 Status 101 Change 1
usb-hub usb1: port 1 connection change
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 
length 0x4
usb-hub usb1: portstatus 101, change 1, 12 Mb/s
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x10 index 0x1 
length 0x0
usb-hub usb1: hub_port_reset: resetting port 0...
usb: usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x1 
length 0x0
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 
length 0x4
usb-hub usb1: portstatus 503, change 10, 480 Mb/s
usb-hub usb1: STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  USB_PORT_STAT_ENABLE 1
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x14 index 0x1 
length 0x0
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0 
length 0x40
usb-hub usb1: hub_port_reset: resetting port 0...
usb: usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x1 
length 0x0
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 
length 0x4
usb-hub usb1: portstatus 503, change 10, 480 Mb/s
usb-hub usb1: STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  USB_PORT_STAT_ENABLE 1
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x14 index 0x1 
length 0x0
usb: set address 2
usb: usb_control_msg: request: 0x5, requesttype: 0x0, value 0x2 index 0x0 
length 0x0
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0 
length 0x12
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0 
length 0x9
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0 
length 0x29
usb: get_conf_no 0 Result 41, wLength 41
usb: if 0, ep 0
usb: if 0, ep 1
usb: ##EP epmaxpacketin[1] = 1
usb: set configuration 1
usb: usb_control_msg: request: 0x9, requesttype: 0x0, value 0x1 index 0x0 
length 0x0
usb: new device: Mfr=0, Product=0, SerialNumber=0
usb: Bus 001 Device 002: ID 0424:2514
usb: matching: 0x0424 0x2514
usb: matching: 0x0424 0x2514
usb: matching: 0x0424 0x2514
usb: match: 0x0000 0x0000
usb: usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index 0x0 
length 0x4
usb: usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index 0x0 
length 0x9
usb-hub usb1-0: 4 ports detected
usb-hub usb1-0: individual port power switching
usb-hub usb1-0: standalone hub
usb-hub usb1-0: individual port over-current protection
usb-hub usb1-0: power on to power good time: 100ms
usb-hub usb1-0: hub controller current requirement: 1mA
usb-hub usb1-0: port 1 is removable
usb-hub usb1-0: port 2 is removable
usb-hub usb1-0: port 3 is removable
usb-hub usb1-0: port 4 is removable
usb: usb_control_msg: request: 0x0, requesttype: 0xA0, value 0x0 index 0x0 
length 0x4
usb-hub usb1-0: get_hub_status returned status 0, change 0
usb-hub usb1-0: local power source is good
usb-hub usb1-0: no over-current condition exists
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x8 index 0x1 
length 0x0
usb-hub usb1-0: port 1 returns 0
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x8 index 0x2 
length 0x0
usb-hub usb1-0: port 2 returns 0
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x8 index 0x3 
length 0x0
usb-hub usb1-0: port 3 returns 0
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x8 index 0x4 
length 0x0
usb-hub usb1-0: port 4 returns 0
usb-hub usb1-0: enabling power on all ports
usb: usb_control_msg: request: 0x3, requesttype: 0x23, value 0x8 index 0x1 
length 0x0
usb-hub usb1-0: port 1 returns 0
usb: usb_control_msg: request: 0x3, requesttype: 0x23, value 0x8 index 0x2 
length 0x0
usb-hub usb1-0: port 2 returns 0
usb: usb_control_msg: request: 0x3, requesttype: 0x23, value 0x8 index 0x3 
length 0x0
usb-hub usb1-0: port 3 returns 0
usb: usb_control_msg: request: 0x3, requesttype: 0x23, value 0x8 index 0x4 
length 0x0
usb-hub usb1-0: port 4 returns 0
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 
length 0x4
usb-hub usb1-0: Port 1 Status 101 Change 1
usb-hub usb1-0: port 1 connection change
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 
length 0x4
usb-hub usb1-0: portstatus 101, change 1, 12 Mb/s
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x10 index 0x1 
length 0x0
usb-hub usb1-0: hub_port_reset: resetting port 0...
usb: usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x1 
length 0x0
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 
length 0x4
usb-hub usb1-0: portstatus 103, change 10, 12 Mb/s
usb-hub usb1-0: STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  USB_PORT_STAT_ENABLE 
1
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x14 index 0x1 
length 0x0
usb: usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0 
length 0x40
usb: usb_new_device: usb_get_descriptor() failed with -110
usb-hub usb1-0: hub: disabling port 1
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x1 index 0x1 
length 0x0
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x2 
length 0x4
usb-hub usb1-0: Port 2 Status 100 Change 0
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x3 
length 0x4
usb-hub usb1-0: Port 3 Status 100 Change 0
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x4 
length 0x4
usb-hub usb1-0: Port 4 Status 100 Change 0
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 
length 0x4
usb-hub usb1-0: Port 1 Status 101 Change 1
usb-hub usb1-0: port 1 connection change
usb: usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 
length 0x4
usb-hub usb1-0: portstatus 101, change 1, 12 Mb/s
usb: usb_control_msg: request: 0x1, requesttype: 0x23, value 0x10 index 0x1 
length 0x0
unable to handle NULL pointer dereference at address 0x00000004
pc : [<2fe1d48a>]    lr : [<2fe1e651>]
sp : 2ffefce0  ip : 00000016  fp : 00000001
r10: 00000101  r9 : 00000001  r8 : 20183cd4
r7 : 00000000  r6 : 20185af0  r5 : 20185b14  r4 : 20185004
r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 : 20185b14
Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
[<2fe1d48a>] (usb_remove_device+0x4e/0x98) from [<2fe1e651>] 
(usb_hub_detect+0x149/0x2b0)
[<2fe1e651>] (usb_hub_detect+0x149/0x2b0) from [<2fe1e771>] 
(usb_hub_detect+0x269/0x2b0)
[<2fe1e771>] (usb_hub_detect+0x269/0x2b0) from [<2fe1df47>] 
(usb_host_detect+0x3f/0x44)
[<2fe1df47>] (usb_host_detect+0x3f/0x44) from [<2fe1df6d>] 
(usb_rescan+0x21/0x48)
[<2fe1df6d>] (usb_rescan+0x21/0x48) from [<2fe3100d>] (do_usb+0x2d/0xa8)
[<2fe3100d>] (do_usb+0x2d/0xa8) from [<2fe02bc9>] (execute_command+0x21/0x48)
[<2fe02bc9>] (execute_command+0x21/0x48) from [<2fe06e2f>] 
(run_list_real+0x55b/0x618)
[<2fe06e2f>] (run_list_real+0x55b/0x618) from [<2fe067a5>] 
(parse_stream_outer+0xd9/0x164)
[<2fe067a5>] (parse_stream_outer+0xd9/0x164) from [<2fe0702b>] 
(run_shell+0x33/0x60)
[<2fe0702b>] (run_shell+0x33/0x60) from [<2fe0092d>] (start_barebox+0x6d/0x98)
[<2fe0092d>] (start_barebox+0x6d/0x98) from [<2fe4d377>] 
(barebox_non_pbl_start+0xd7/0xfc)
[<2fe4d377>] (barebox_non_pbl_start+0xd7/0xfc) from [<2fe00005>] 
(__bare_init_start+0x1/0xc)

[<2fe4ecb5>] (unwind_backtrace+0x1/0x58) from [<2fe00b65>] (panic+0x1d/0x2c)
[<2fe00b65>] (panic+0x1d/0x2c) from [<2fe4d131>] (do_exception+0xd/0x10)
[<2fe4d131>] (do_exception+0xd/0x10) from [<2fe4d191>] (do_data_abort+0x21/0x2c)
[<2fe4d191>] (do_data_abort+0x21/0x2c) from [<2fe4c8d4>] (do_abort_6+0x48/0x54)
[<2fe4c8d4>] (do_abort_6+0x48/0x54) from [<00000000>] (0x0)



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