Bug 69031

Summary:	moxa: TX descriptor length bits not cleared between sends
Product:	Drivers	Reporter:	Jonas Jensen (jonas.jensen)
Component:	Network	Assignee:	drivers_network (drivers_network)
Status:	CLOSED CODE_FIX
Severity:	high
Priority:	P1
Hardware:	ARM
OS:	Linux
Kernel Version:	3.12-rc1	Subsystem:
Regression:	No	Bisected commit-id:

Description Jonas Jensen 2014-01-20 10:21:50 UTC

TX_DESC1_BUF_SIZE_MASK is not added to bits that are cleared, before the TX buffer length is set. 

Failing to do so can cause the controller to drop dead i.e. all TX interrupts stop, resulting in complete communication failure.

Comment 1 Jonas Jensen 2014-10-06 07:17:00 UTC

Fixed in v3.17-rc5.

See commit "net: moxa: clear DESC1 on ndo_start_xmit()" b853f31940c84cce6a3f5cb4f529b029906ee69c.