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can: kvaser_usb: Leaf bugfixes and USBCan-II support

Ahmed S. Darwish linux-can lkml netdev stable 1 version In review

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  1. v6 Latest7 patches 9 repliesIn review

Patches in v6 No applies recorded yet

#Subject and filesSizeRepliesApplied
1/7can: kvaser_usb: Do not sleep in atomic contextdrivers/net/can/usb/kvaser_usb.c+1 -60 replies
2/7can: kvaser_usb: Send correct context to URB completiondrivers/net/can/usb/kvaser_usb.c+1 -10 replies
3/7can: kvaser_usb: Retry the first bulk transfer on -ETIMEDOUTdrivers/net/can/usb/kvaser_usb.c+10 -20 replies
4/7can: kvaser_usb: Fix state handling upon BUS_ERROR eventsdrivers/net/can/usb/kvaser_usb.c+3 -40 replies
5/7can: kvaser_usb: Update interface state before exiting on OOMdrivers/net/can/usb/kvaser_usb.c+105 -764 replies
6/7can: kvaser_usb: Consolidate and unify state change handlingdrivers/net/can/usb/kvaser_usb.c+49 -641 reply
7/7can: kvaser_usb: Add support for the USBcan-II familydrivers/net/can/usb/Kconfig drivers/net/can/usb/kvaser_usb.c+474 -1241 reply

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Cover letter [PATCH v6 0/7] can: kvaser_usb: Leaf bugfixes and USBCan-II support

Hi!

This is an updated patch series for the Kvaser CAN/USB devices:

1- Extra patches are now added to the series. Most importantly patch #1 which fixes a critical `sleep in atomic context' bug in the current upstream driver. Patch #2 fixes a corruption in the kernel logs, also affecting current upstream driver. Patch #4 was originally USBCan-II only, but since it's a generic fix, it's now retrofitted to the Leaf-only upstream driver first.

2- The series has been re-organized so that patches #1 -> #4 inclusive can go to linux-can/origin, while the rest can move to -next.

3- There are some important updates regarding the USBCan-II error counters, and how really erratic their heaviour is. All the new details are covered at the bottom of this URL:

	http://article.gmane.org/gmane.linux.can/7481

4- Attached below is the new candump traces. Now back-to-error-active' states appear _if_ the hardware was kind enough and decreased the error counters appropriately. The earlier code did not recognize the error counters going down, thus the back-to-error-active' transitions did not appear.

###########################################################

* Bus-off scenario (with transitions active -> passive -> back-to-active):

(000.000000) can0 20000080 [8] 00 00 00 00 00 00 30 00 ERRORFRAME

	bus-error
	error-counter-tx-rx{{48}{0}}
 (000.000011)  can0  20000084   [8]  00 20 00 00 00 00 88 00   ERRORFRAME
	controller-problem{tx-error-passive}
	bus-error
	error-counter-tx-rx{{136}{0}}
 (000.000001)  can0  20000080   [8]  00 00 00 00 00 00 88 00   ERRORFRAME
	bus-error
	error-counter-tx-rx{{136}{0}}
 (000.000987)  can0  20000080   [8]  00 00 00 00 00 00 98 00   ERRORFRAME
	bus-error
	error-counter-tx-rx{{152}{0}}
 (000.002011)  can0  20000084   [8]  00 40 00 00 00 00 30 00   ERRORFRAME
	controller-problem{back-to-error-active}
	bus-error
	error-counter-tx-rx{{48}{0}}
 (000.000004)  can0  20000084   [8]  00 20 00 00 00 00 78 00   ERRORFRAME
	controller-problem{tx-error-passive}
	bus-error
	error-counter-tx-rx{{120}{0}}
 (000.000002)  can0  20000080   [8]  00 00 00 00 00 00 88 00   ERRORFRAME
	bus-error
	error-counter-tx-rx{{136}{0}}
 (000.000005)  can0  20000080   [8]  00 00 00 00 00 00 90 00   ERRORFRAME
	bus-error
	error-counter-tx-rx{{144}{0}}
 (000.000002)  can0  20000080   [8]  00 00 00 00 00 00 98 00   ERRORFRAME
	bus-error
	error-counter-tx-rx{{152}{0}}
 (000.000001)  can0  20000080   [8]  00 00 00 00 00 00 A0 00   ERRORFRAME
	bus-error
	error-counter-tx-rx{{160}{0}}
 (000.000966)  can0  20000080   [8]  00 00 00 00 00 00 A8 00   ERRORFRAME
	bus-error
	error-counter-tx-rx{{168}{0}}
 (000.002998)  can0  20000084   [8]  00 40 00 00 00 00 30 00   ERRORFRAME
	controller-problem{back-to-error-active}
	bus-error
	error-counter-tx-rx{{48}{0}}
 (000.000004)  can0  20000084   [8]  00 20 00 00 00 00 80 00   ERRORFRAME
	controller-problem{tx-error-passive}
	bus-error
	error-counter-tx-rx{{128}{0}}
 (000.000002)  can0  20000080   [8]  00 00 00 00 00 00 88 00   ERRORFRAME
	bus-error
	error-counter-tx-rx{{136}{0}}
 (001.031035)  can0  200000C0   [8]  00 00 00 00 00 00 00 29   ERRORFRAME
	bus-off
	bus-error
	error-counter-tx-rx{{0}{41}}

###########################################################

Regular sending, unpluggng CAN connector, then plugging again:

(with transitions active -> warning -> passive)

[ As stated earlier, the counters don't get decreased upon CAN replug, even if they were constantly polled. ]

 (000.011001)  can0  2A1   [1]  E5
 (000.010001)  can0  50E   [8]  E6 05 00 00 00 00 00 00
 (000.009999)  can0  009   [1]  E7
 (000.011000)  can0  6E2   [8]  E8 05 00 00 00 00 00 00
 (000.009999)  can0  314   [2]  E9 05
 (000.010001)  can0  708   [6]  EA 05 00 00 00 00
 (000.010991)  can0  20000080   [8]  00 00 00 00 00 00 00 09   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{9}}
 (000.000002)  can0  20000080   [8]  00 00 00 00 00 00 00 0A   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{10}}
 (000.000007)  can0  20000080   [8]  00 00 00 00 00 00 00 2E   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{46}}
 (000.000003)  can0  20000080   [8]  00 00 00 00 00 00 00 37   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{55}}
 (000.000002)  can0  20000080   [8]  00 00 00 00 00 00 00 40   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{64}}
 (000.000993)  can0  20000080   [8]  00 00 00 00 00 00 00 49   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{73}}
 (000.000002)  can0  20000080   [8]  00 00 00 00 00 00 00 52   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{82}}
 (000.000001)  can0  20000080   [8]  00 00 00 00 00 00 00 5B   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{91}}
 (000.000028)  can0  20000084   [8]  00 04 00 00 00 00 00 6C   ERRORFRAME
	controller-problem{rx-error-warning}
	bus-error
	error-counter-tx-rx{{0}{108}}
 (000.000955)  can0  20000080   [8]  00 00 00 00 00 00 00 7F   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{127}}
 (000.000008)  can0  20000084   [8]  00 10 00 00 00 00 00 87   ERRORFRAME
	controller-problem{rx-error-passive}
	bus-error
	error-counter-tx-rx{{0}{135}}
 (000.000001)  can0  20000080   [8]  00 00 00 00 00 00 00 87   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{135}}
 (000.000004)  can0  20000080   [8]  00 00 00 00 00 00 00 87   ERRORFRAME
	bus-error
	error-counter-tx-rx{{0}{135}}

((( Then a continous flood, exactly similar to the above packet, appears )))

 (000.500004)  can0  2ED   [4]  EB 05 00 00
 (000.000006)  can0  0DD   [5]  EC 05 00 00 00
 (000.000002)  can0  1D3   [1]  ED
 (000.000988)  can0  20D   [8]  EE 05 00 00 00 00 00 00
 (000.000006)  can0  04B   [8]  EF 05 00 00 00 00 00 00
 (000.000002)  can0  320   [8]  F0 05 00 00 00 00 00 00
 (000.000002)  can0  023   [8]  F1 05 00 00 00 00 00 00
 (000.000989)  can0  21D   [8]  F2 05 00 00 00 00 00 00
 (000.000005)  can0  17D   [8]  F3 05 00 00 00 00 00 00
 (000.000002)  can0  6DC   [8]  F4 05 00 00 00 00 00 00
 (000.000993)  can0  62D   [8]  F5 05 00 00 00 00 00 00
 (000.000006)  can0  18B   [6]  F6 05 00 00 00 00
 (000.000001)  can0  7EB   [8]  F7 05 00 00 00 00 00 00
 (000.000001)  can0  014   [8]  F8 05 00 00 00 00 00 00
 (000.000994)  can0  52F   [8]  F9 05 00 00 00 00 00 00

--
Regards,
Darwish

Read the cover letter in its thread