Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265196AbUIMDLu (ORCPT ); Sun, 12 Sep 2004 23:11:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265487AbUIMDJ6 (ORCPT ); Sun, 12 Sep 2004 23:09:58 -0400 Received: from umhlanga.stratnet.net ([12.162.17.40]:53105 "EHLO umhlanga.STRATNET.NET") by vger.kernel.org with ESMTP id S265887AbUIMDJ1 (ORCPT ); Sun, 12 Sep 2004 23:09:27 -0400 Subject: [PATCH][2/2] USB: use HOTPLUG_ENV_VAR in core/usb.c In-Reply-To: <10950449652309@topspin.com> X-Mailer: roland_patchbomb Date: Sun, 12 Sep 2004 20:09:25 -0700 Message-Id: <1095044965670@topspin.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII To: greg@kroah.com, linux-kernel@vger.kernel.org Content-Transfer-Encoding: 7BIT From: Roland Dreier X-OriginalArrivalTime: 13 Sep 2004 03:09:25.0997 (UTC) FILETIME=[135B81D0:01C4993F] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3866 Lines: 121 Use the new HOTPLUG_ENV_VAR macro is drivers/usb/core/usb.c. In addition to cleaning up the code, this fixes a (probably harmless) bug here: for each value added to the environment, the code did length += sprintf(...); and then scratch += length; which means that we skip the sum of the lengths of all the values we've put so far, rather than just the length of the value we just put. This is probably harmless since we're unlikely to run out of space but if nothing else it's setting a bad example.... I've tested this on a system with USB floppy and CD-ROM; hotplug gets the same environment with the patch as without. Signed-off-by: Roland Dreier Index: linux-bk/drivers/usb/core/usb.c =================================================================== --- linux-bk.orig/drivers/usb/core/usb.c 2004-09-12 15:21:27.000000000 -0700 +++ linux-bk/drivers/usb/core/usb.c 2004-09-12 19:28:23.000000000 -0700 @@ -564,9 +564,7 @@ { struct usb_interface *intf; struct usb_device *usb_dev; - char *scratch; int i = 0; - int length = 0; if (!dev) return -ENODEV; @@ -591,8 +589,6 @@ return -ENODEV; } - scratch = buffer; - #ifdef CONFIG_USB_DEVICEFS /* If this is available, userspace programs can directly read * all the device descriptors we don't tell them about. Or @@ -600,37 +596,27 @@ * * FIXME reduce hardwired intelligence here */ - envp [i++] = scratch; - length += snprintf (scratch, buffer_size - length, + if (HOTPLUG_ENV_VAR(buffer, buffer_size, envp, num_envp, i, "DEVICE=/proc/bus/usb/%03d/%03d", - usb_dev->bus->busnum, usb_dev->devnum); - if ((buffer_size - length <= 0) || (i >= num_envp)) + usb_dev->bus->busnum, usb_dev->devnum)) return -ENOMEM; - ++length; - scratch += length; #endif /* per-device configurations are common */ - envp [i++] = scratch; - length += snprintf (scratch, buffer_size - length, "PRODUCT=%x/%x/%x", + if (HOTPLUG_ENV_VAR(buffer, buffer_size, envp, num_envp, i, + "PRODUCT=%x/%x/%x", usb_dev->descriptor.idVendor, usb_dev->descriptor.idProduct, - usb_dev->descriptor.bcdDevice); - if ((buffer_size - length <= 0) || (i >= num_envp)) + usb_dev->descriptor.bcdDevice)) return -ENOMEM; - ++length; - scratch += length; /* class-based driver binding models */ - envp [i++] = scratch; - length += snprintf (scratch, buffer_size - length, "TYPE=%d/%d/%d", + if (HOTPLUG_ENV_VAR(buffer, buffer_size, envp, num_envp, i, + "TYPE=%d/%d/%d", usb_dev->descriptor.bDeviceClass, usb_dev->descriptor.bDeviceSubClass, - usb_dev->descriptor.bDeviceProtocol); - if ((buffer_size - length <= 0) || (i >= num_envp)) + usb_dev->descriptor.bDeviceProtocol)) return -ENOMEM; - ++length; - scratch += length; if (usb_dev->descriptor.bDeviceClass == 0) { struct usb_host_interface *alt = intf->cur_altsetting; @@ -639,18 +625,14 @@ * agents are called for all interfaces, and can use * $DEVPATH/bInterfaceNumber if necessary. */ - envp [i++] = scratch; - length += snprintf (scratch, buffer_size - length, - "INTERFACE=%d/%d/%d", - alt->desc.bInterfaceClass, - alt->desc.bInterfaceSubClass, - alt->desc.bInterfaceProtocol); - if ((buffer_size - length <= 0) || (i >= num_envp)) + if (HOTPLUG_ENV_VAR(buffer, buffer_size, envp, num_envp, i, + "INTERFACE=%d/%d/%d", + alt->desc.bInterfaceClass, + alt->desc.bInterfaceSubClass, + alt->desc.bInterfaceProtocol)) return -ENOMEM; - ++length; - scratch += length; - } + envp[i++] = NULL; return 0; - 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/