[PATCH 62/76] uas: Fix command / task mgmt submission racing with disconnect

[Sarah Sharp]

From: Hans de Goede <hdego...@redhat.com>

Signed-off-by: Hans de Goede <hdego...@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sh...@linux.intel.com>
---
 drivers/usb/storage/uas.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index cfe0102fcbae..8c685801e267 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -670,13 +670,15 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 
        BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 
+       spin_lock_irqsave(&devinfo->lock, flags);
+
        if (devinfo->resetting) {
                cmnd->result = DID_ERROR << 16;
                cmnd->scsi_done(cmnd);
+               spin_unlock_irqrestore(&devinfo->lock, flags);
                return 0;
        }
 
-       spin_lock_irqsave(&devinfo->lock, flags);
        if (devinfo->cmnd) {
                spin_unlock_irqrestore(&devinfo->lock, flags);
                return SCSI_MLQUEUE_DEVICE_BUSY;
@@ -740,6 +742,11 @@ static int uas_eh_task_mgmt(struct scsi_cmnd *cmnd,
 
        spin_lock_irqsave(&devinfo->lock, flags);
 
+       if (devinfo->resetting) {
+               spin_unlock_irqrestore(&devinfo->lock, flags);
+               return FAILED;
+       }
+
        if (devinfo->running_task) {
                shost_printk(KERN_INFO, shost,
                             "%s: %s: error already running a task\n",
@@ -809,6 +816,12 @@ static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
        int ret;
 
        spin_lock_irqsave(&devinfo->lock, flags);
+
+       if (devinfo->resetting) {
+               spin_unlock_irqrestore(&devinfo->lock, flags);
+               return FAILED;
+       }
+
        uas_mark_cmd_dead(devinfo, cmdinfo, __func__);
        if (cmdinfo->state & COMMAND_INFLIGHT) {
                spin_unlock_irqrestore(&devinfo->lock, flags);
-- 
1.8.5.5

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