Changeset 7e1b130 in mainline for uspace/drv/bus/usb/vhc/hub.c

Timestamp:

2011-12-23T18:13:33Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

3819ce5, b39eb79, f0b74b2

Parents:

2f0dd2a (diff), 153cc76a (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

USB branch changes.

+ USB device drivers use single async session to host controller, this session (represented by usb_hc_connection_t) is used for both HC requests and to back usb device connection.
+ Pipe locking was removed. Reference counting was moved to usb_hc_connection_t. Every read/write operation uses separate parallel exchange thus any contention is resolved on hc side.

• async_sess_t setup using EXCHANGE_PARALLEL uses one extra phone (session phone, each exch creates its own), thus the number of phones used by usb dvice driver might increase. Possible solutions are: make read/write calls atomic (all other calls are atomic) and use EXCHANGE_ATOMIC, any other solution provided by changes to async_sess_t.

File:

• uspace/drv/bus/usb/vhc/hub.c (modified) (1 diff)

uspace/drv/bus/usb/vhc/hub.c

@@ -107 +107 @@
 
         usb_hc_connection_t hc_conn;
-        rc = usb_hc_connection_initialize(&hc_conn, hc_dev->handle);
-        assert(rc == EOK);
+        usb_hc_connection_initialize(&hc_conn, hc_dev->handle);
 
         rc = usb_hc_connection_open(&hc_conn);