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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-07-07 21:16:08 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2008-08-14 02:32:53 +0200
commit937ef73d5075997a8d1777abf217a48bef2ce029 (patch)
treea52d840362b3421116c29aa9a2636a8c30d70154 /drivers/usb/image
parentUSB: Hook start_hnp into ohci struct (diff)
downloadlinux-937ef73d5075997a8d1777abf217a48bef2ce029.tar.xz
linux-937ef73d5075997a8d1777abf217a48bef2ce029.zip
USB: serial gadget: rx path data loss fixes
Update RX path handling in new serial gadget code to cope better with RX blockage: queue every RX packet until its contents can safely be passed up to the ldisc. Most of the RX path work is now done in the RX tasklet, instead of just the final "push to ldisc" step. This addresses some cases of data loss: - A longstanding serial gadget bug: when tty_insert_flip_string() didn't copy the entire buffer, the rest of the characters were dropped! Now that packet stays queued until the rest of its data is pushed to the ldisc. - Another longstanding issue: in the unlikely case that an RX transfer returns data and also reports a fault, that data is no longer discarded. - In the recently added RX throttling logic: it needs to stop pushing data into the TTY layer, instead of just not submitting new USB read requests. When the TTY is throttled long enough, backpressure will eventually make the OUT endpoint NAK. Also: an #ifdef is removed (no longer necessary); and start switching to a better convention for debug messages (prefix them with tty name). Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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