[haiku-bugs] [Haiku] #7449: Check for invalid Frame List Sizes and enable Asynchronous Park Capability
- From: "gabriel.hartmann" <trac@xxxxxxxxxxxx>
- Date: Sat, 16 Apr 2011 02:28:54 -0000
#7449: Check for invalid Frame List Sizes and enable Asynchronous Park
Capability
------------------------------+------------------------------
Reporter: gabriel.hartmann | Owner: mmlr
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Drivers/USB | Version: R1/Development
Keywords: EHCI | Blocked By:
Blocking: | Has a Patch: 0
Platform: All |
------------------------------+------------------------------
In src/add-ons/kernel/busses/usb/ehci.cpp beginning of EHCI::Start()
* frameListSize was read but not checked against invalid values (see
section 2.3.1 of the EHCI specification). The possible values are:
00b = 1024 elements, 01b = 512 elements, 10b = 256 elements, 11b =
Reserved
* if the Asynchronous Park Capability bit in the EHCI_HCCPARAMS register
is a one, enable EHCI_USBCMD_ASPME and set the count to 3.
--
Ticket URL: <http://dev.haiku-os.org/ticket/7449>
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