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Message-ID: <20090414135728.13935.47954.stgit@t61.ukuu.org.uk> Date: Tue, 14 Apr 2009 14:57:36 +0100 From: Alan Cox <alan@...rguk.ukuu.org.uk> To: torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org Subject: [PATCH 1/4] cdc-acm: Fix long standing abuse of tty->low_latency ACM sets the low latency flag but calls the flip buffer routines from IRQ context which isn't permitted (and as of 2.6.29 causes a warning hence this one was caught) Fortunatelt ACM doesn't need to set this flag in the first place as it only set it to work around problems in ancient (pre tty flip rewrite) kernels. Reported-by: Chuck Ebbert <cebbert@...hat.com> Signed-off-by: Alan Cox <alan@...rguk.ukuu.org.uk> --- drivers/usb/class/cdc-acm.c | 4 ---- 1 files changed, 0 insertions(+), 4 deletions(-) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 869d47c..0a69c09 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -546,10 +546,6 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp) tty->driver_data = acm; acm->tty = tty; - /* force low_latency on so that our tty_push actually forces the data through, - otherwise it is scheduled, and with high data rates data can get lost. */ - tty->low_latency = 1; - if (usb_autopm_get_interface(acm->control) < 0) goto early_bail; else -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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