Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753765AbbGWPre (ORCPT ); Thu, 23 Jul 2015 11:47:34 -0400 Received: from smtp97.iad3a.emailsrvr.com ([173.203.187.97]:40453 "EHLO smtp97.iad3a.emailsrvr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752897AbbGWPrW (ORCPT ); Thu, 23 Jul 2015 11:47:22 -0400 X-Sender-Id: abbotti@mev.co.uk From: Ian Abbott To: Cc: Greg Kroah-Hartman , Ian Abbott , H Hartley Sweeten , Bernd Porr , , Subject: [PATCH 1/6] staging: comedi: usbduxsigma: don't clobber ai_timer in command test Date: Thu, 23 Jul 2015 16:46:57 +0100 Message-Id: <1437666422-25222-2-git-send-email-abbotti@mev.co.uk> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1437666422-25222-1-git-send-email-abbotti@mev.co.uk> References: <1437666422-25222-1-git-send-email-abbotti@mev.co.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2967 Lines: 85 `devpriv->ai_timer` is used while an asynchronous command is running on the AI subdevice. It also gets modified by the subdevice's `cmdtest` handler for checking new asynchronous commands (`usbduxsigma_ai_cmdtest()`), which is not correct as it's allowed to check new commands while an old command is still running. Fix it by moving the code which sets up `devpriv->ai_timer` and `devpriv->ai_interval` into the subdevice's `cmd` handler, `usbduxsigma_ai_cmd()`. Note that the removed code in `usbduxsigma_ai_cmdtest()` checked that `devpriv->ai_timer` did not end up less than than 1, but that could not happen because `cmd->scan_begin_arg` had already been checked to be at least the minimum required value (at least when `cmd->scan_begin_src == TRIG_TIMER`, which had also been checked to be the case). Fixes: b986be8527c7 ("staging: comedi: usbduxsigma: tidy up analog input command support) Signed-off-by: Ian Abbott Cc: # 3.19 onwards --- drivers/staging/comedi/drivers/usbduxsigma.c | 37 ++++++++++++---------------- 1 file changed, 16 insertions(+), 21 deletions(-) diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c index eaa9add..22517de 100644 --- a/drivers/staging/comedi/drivers/usbduxsigma.c +++ b/drivers/staging/comedi/drivers/usbduxsigma.c @@ -550,27 +550,6 @@ static int usbduxsigma_ai_cmdtest(struct comedi_device *dev, if (err) return 3; - /* Step 4: fix up any arguments */ - - if (high_speed) { - /* - * every 2 channels get a time window of 125us. Thus, if we - * sample all 16 channels we need 1ms. If we sample only one - * channel we need only 125us - */ - devpriv->ai_interval = interval; - devpriv->ai_timer = cmd->scan_begin_arg / (125000 * interval); - } else { - /* interval always 1ms */ - devpriv->ai_interval = 1; - devpriv->ai_timer = cmd->scan_begin_arg / 1000000; - } - if (devpriv->ai_timer < 1) - err |= -EINVAL; - - if (err) - return 4; - return 0; } @@ -668,6 +647,22 @@ static int usbduxsigma_ai_cmd(struct comedi_device *dev, down(&devpriv->sem); + if (devpriv->high_speed) { + /* + * every 2 channels get a time window of 125us. Thus, if we + * sample all 16 channels we need 1ms. If we sample only one + * channel we need only 125us + */ + unsigned int interval = usbduxsigma_chans_to_interval(len); + + devpriv->ai_interval = interval; + devpriv->ai_timer = cmd->scan_begin_arg / (125000 * interval); + } else { + /* interval always 1ms */ + devpriv->ai_interval = 1; + devpriv->ai_timer = cmd->scan_begin_arg / 1000000; + } + for (i = 0; i < len; i++) { unsigned int chan = CR_CHAN(cmd->chanlist[i]); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/