Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932102Ab3IBL0p (ORCPT ); Mon, 2 Sep 2013 07:26:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44325 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758046Ab3IBL0N (ORCPT ); Mon, 2 Sep 2013 07:26:13 -0400 From: Gerd Hoffmann To: linux-usb@vger.kernel.org Cc: Gerd Hoffmann , Matthew Wilcox , Sarah Sharp , Matthew Dharm , Greg Kroah-Hartman , linux-scsi@vger.kernel.org (open list:USB ATTACHED SCSI), usb-storage@lists.one-eyed-alien.net (open list:USB MASS STORAGE...), linux-kernel@vger.kernel.org (open list) Subject: [PATCH 4/5] uas: add dead request list Date: Mon, 2 Sep 2013 13:25:28 +0200 Message-Id: <1378121129-32594-5-git-send-email-kraxel@redhat.com> In-Reply-To: <1378121129-32594-1-git-send-email-kraxel@redhat.com> References: <1378121129-32594-1-git-send-email-kraxel@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5958 Lines: 169 This patch adds a new list where all requests which are canceled are added to, so we don't loose them. Then, after killing all inflight urbs on bus reset (and disconnect) we'll walk over the list and clean them up. Without this we can end up with aborted requests lingering around in case of status pipe transfer errors. Signed-off-by: Gerd Hoffmann --- drivers/usb/storage/uas.c | 69 +++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 61 insertions(+), 8 deletions(-) diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c index a63972a..9dfb8f9 100644 --- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -78,6 +78,7 @@ struct uas_cmd_info { struct urb *data_in_urb; struct urb *data_out_urb; struct list_head work; + struct list_head dead; }; /* I hate forward declarations, but I actually have a loop */ @@ -87,10 +88,12 @@ static void uas_do_work(struct work_struct *work); static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller); static void uas_configure_endpoints(struct uas_dev_info *devinfo); static void uas_free_streams(struct uas_dev_info *devinfo); +static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller); static DECLARE_WORK(uas_work, uas_do_work); static DEFINE_SPINLOCK(uas_lists_lock); static LIST_HEAD(uas_work_list); +static LIST_HEAD(uas_dead_list); static void uas_unlink_data_urbs(struct uas_dev_info *devinfo, struct uas_cmd_info *cmdinfo) @@ -167,15 +170,13 @@ static void uas_abort_work(struct uas_dev_info *devinfo) struct uas_dev_info *di = (void *)cmnd->device->hostdata; if (di == devinfo) { + uas_log_cmd_state(cmnd, __func__); + BUG_ON(cmdinfo->state & COMMAND_ABORTED); cmdinfo->state |= COMMAND_ABORTED; + spin_lock_irq(&uas_lists_lock); + list_add_tail(&cmdinfo->dead, &uas_dead_list); + spin_unlock_irq(&uas_lists_lock); cmdinfo->state &= ~IS_IN_WORK_LIST; - if (devinfo->resetting) { - /* uas_stat_cmplt() will not do that - * when a device reset is in - * progress */ - cmdinfo->state &= ~COMMAND_INFLIGHT; - } - uas_try_complete(cmnd, __func__); } else { /* not our uas device, relink into list */ list_del(&cmdinfo->work); @@ -187,6 +188,43 @@ static void uas_abort_work(struct uas_dev_info *devinfo) spin_unlock_irqrestore(&devinfo->lock, flags); } +static void uas_zap_dead(struct uas_dev_info *devinfo) +{ + struct uas_cmd_info *cmdinfo; + struct uas_cmd_info *temp; + struct list_head list; + unsigned long flags; + + spin_lock_irq(&uas_lists_lock); + list_replace_init(&uas_dead_list, &list); + spin_unlock_irq(&uas_lists_lock); + + spin_lock_irqsave(&devinfo->lock, flags); + list_for_each_entry_safe(cmdinfo, temp, &list, dead) { + struct scsi_pointer *scp = (void *)cmdinfo; + struct scsi_cmnd *cmnd = container_of(scp, + struct scsi_cmnd, SCp); + struct uas_dev_info *di = (void *)cmnd->device->hostdata; + + if (di == devinfo) { + uas_log_cmd_state(cmnd, __func__); + BUG_ON(!(cmdinfo->state & COMMAND_ABORTED)); + /* all urbs are killed, clear inflight bits */ + cmdinfo->state &= ~(COMMAND_INFLIGHT | + DATA_IN_URB_INFLIGHT | + DATA_OUT_URB_INFLIGHT); + uas_try_complete(cmnd, __func__); + } else { + /* not our uas device, relink into list */ + list_del(&cmdinfo->dead); + spin_lock_irq(&uas_lists_lock); + list_add_tail(&cmdinfo->dead, &uas_dead_list); + spin_unlock_irq(&uas_lists_lock); + } + } + spin_unlock_irqrestore(&devinfo->lock, flags); +} + static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd) { struct sense_iu *sense_iu = urb->transfer_buffer; @@ -274,6 +312,9 @@ static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller) if (cmdinfo->state & COMMAND_ABORTED) { scmd_printk(KERN_INFO, cmnd, "abort completed\n"); cmnd->result = DID_ABORT << 16; + spin_lock_irq(&uas_lists_lock); + list_del(&cmdinfo->dead); + spin_unlock_irq(&uas_lists_lock); } cmnd->scsi_done(cmnd); return 0; @@ -307,7 +348,12 @@ static void uas_stat_cmplt(struct urb *urb) u16 tag; if (urb->status) { - dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status); + if (urb->status == -ENOENT) { + dev_err(&urb->dev->dev, "stat urb: killed (stream %d\n", + urb->stream_id); + } else { + dev_err(&urb->dev->dev, "stat urb: status %d\n", urb->status); + } usb_free_urb(urb); return; } @@ -762,7 +808,11 @@ static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) uas_log_cmd_state(cmnd, __func__); spin_lock_irqsave(&devinfo->lock, flags); + BUG_ON(cmdinfo->state & COMMAND_ABORTED); cmdinfo->state |= COMMAND_ABORTED; + spin_lock_irq(&uas_lists_lock); + list_add_tail(&cmdinfo->dead, &uas_dead_list); + spin_unlock_irq(&uas_lists_lock); if (cmdinfo->state & IS_IN_WORK_LIST) { spin_lock(&uas_lists_lock); list_del(&cmdinfo->work); @@ -797,11 +847,13 @@ static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd) struct usb_device *udev = devinfo->udev; int err; + shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__); devinfo->resetting = 1; uas_abort_work(devinfo); usb_kill_anchored_urbs(&devinfo->cmd_urbs); usb_kill_anchored_urbs(&devinfo->sense_urbs); usb_kill_anchored_urbs(&devinfo->data_urbs); + uas_zap_dead(devinfo); uas_free_streams(devinfo); err = usb_reset_device(udev); if (!err) { @@ -1055,6 +1107,7 @@ static void uas_disconnect(struct usb_interface *intf) usb_kill_anchored_urbs(&devinfo->cmd_urbs); usb_kill_anchored_urbs(&devinfo->sense_urbs); usb_kill_anchored_urbs(&devinfo->data_urbs); + uas_zap_dead(devinfo); scsi_remove_host(shost); uas_free_streams(devinfo); kfree(devinfo); -- 1.8.3.1 -- 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/