lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Fri, 05 Sep 2008 16:06:22 +0200
From:	Denis Joseph Barrow <>
To:	Alan Cox <>
CC:	Linux USB kernel mailing list <>,
	Linux netdev Mailing list <>
Subject: Re: [PATCH]  hso.c against 2.6.27-rc5 throttle/unthrottle to prevent
 loss of serial data

Thanks Alan,
I didn't see that check.

I'll shave a few lines off my code & send the patch again. 

Alan Cox wrote:
> O> If my understanding of the n_tty.c code is correct it will
>> only start throttling when there is TTY_THRESHOLD_THROTTLE
>> i.e. 128 bytes left in the n_tty ring buffer this is a very low limit
>> for my driver. This means
>> that if I try to do a tty_flip_buffer_push of
>> of a tty buffer larger than 128 bytes when the threshold
>> is reached I will lose data. My urb buffers are 4k in
>> size 2 buffers of this size up to the tty layer in a row 
>> quickly I believe I'll lose data in the n_tty layer.
> If there is 128 bytes left in the n_tty buffer and you push data it ends
> up in the tty_buffer queue where it will accumulate up to 64K of data
> which will be fired into the tty layer when the tty layer is willing to
> accept it (sets its receive_room).
> Alan

best regards,
D.J. Barrow
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists