Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753725AbbGWPsI (ORCPT ); Thu, 23 Jul 2015 11:48:08 -0400 Received: from smtp97.iad3a.emailsrvr.com ([173.203.187.97]:37073 "EHLO smtp97.iad3a.emailsrvr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753401AbbGWPr0 (ORCPT ); Thu, 23 Jul 2015 11:47:26 -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 4/6] staging: comedi: usbduxsigma: round down AI scan_begin_arg at step 4. Date: Thu, 23 Jul 2015 16:47:00 +0100 Message-Id: <1437666422-25222-5-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: 2236 Lines: 62 The return value of the `cmdtest` handler for a subdevice checks the prospective new command in various steps and returns the step number at which any problem was detected, or 0 if no problem was detected. It is allowed to modify the command in various ways at each step. Corrections for out-of-range values are generally made at step 3, and minor adjustments such as rounding are generally made at step 4. The `cmdtest` handler for the AI subdevice (`usbduxsigma_ai_cmdtest()`) currently modifies `cmd->scan_begin_arg` to bring it into range and round it down at step 3. Move the rounding down part to step 4 to follow the usual Comedi convention. Signed-off-by: Ian Abbott --- drivers/staging/comedi/drivers/usbduxsigma.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c index 65a0df4..4655048 100644 --- a/drivers/staging/comedi/drivers/usbduxsigma.c +++ b/drivers/staging/comedi/drivers/usbduxsigma.c @@ -518,17 +518,12 @@ static int usbduxsigma_ai_cmdtest(struct comedi_device *dev, */ err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, (125000 * interval)); - - tmp = (cmd->scan_begin_arg / 125000) * 125000; } else { /* full speed */ /* 1kHz scans every USB frame */ err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, 1000000); - - tmp = (cmd->scan_begin_arg / 1000000) * 1000000; } - err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, tmp); err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len); @@ -541,6 +536,14 @@ static int usbduxsigma_ai_cmdtest(struct comedi_device *dev, if (err) return 3; + /* Step 4: fix up any arguments */ + + tmp = rounddown(cmd->scan_begin_arg, high_speed ? 125000 : 1000000); + err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, tmp); + + if (err) + return 4; + return 0; } -- 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/