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Code Issues Releases Activity

Crank down UVISORBUFSIZE from 1024 to 64 to avoid a problem where

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the Palm device and the USB host controller deadlock. The USB host
controller is expecting an early-end-of-transmission packet with 0
data, and the Palm doesn't send one because it's already communicated
the amount of data it's going to send in a header (which ucom/uvisor
are oblivious to). This is the problem that has been known on the
pilot-link lists as the "[Free]BSD USB problem", but not understood.

Submitted by:	Nathan J. Williams <nathanw@MIT.EDU>
This commit is contained in:
Josef Karthauser 2003-08-14 00:15:23 +00:00
parent f3300b2f0b
commit 338a591019
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=118890
1 changed files with 11 additions and 1 deletions
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12
sys/dev/usb/uvisor.c
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@ -144,7 +144,17 @@ struct uvisor_connection_info {
#define UVISOR_GET_PALM_INFORMATION_LEN 0x14
#define UVISORIBUFSIZE 1024
/*
* Crank down UVISORBUFSIZE from 1024 to 64 to avoid a problem where
* the Palm device and the USB host controller deadlock. The USB host
* controller is expecting an early-end-of-transmission packet with 0
* data, and the Palm doesn't send one because it's already
* communicated the amount of data it's going to send in a header
* (which ucom/uvisor are oblivious to). This is the problem that has
* been known on the pilot-link lists as the "[Free]BSD USB problem",
* but not understood.
*/
#define UVISORIBUFSIZE 64
#define UVISOROBUFSIZE 1024
struct uvisor_softc {