From eecd11ed47c8c9bd8e7e3dff35baccae18dd0d84 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Mon, 19 Jun 2006 14:50:15 -0400 Subject: [PATCH] [PATCH] usb-storage: fix race between reset and disconnect My recent patch converting usb-storage to use usb_reset_composite_device() added a bug, a race between reset and disconnect. It was necessary to drop the private lock while executing a reset, and if a disconnect occurs at that time it will cause a crash. This patch (as722) fixes the problem by explicitly checking for an early termination after executing each command. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/storage/usb.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c index 1185acac4b21..04c3bec81201 100644 --- a/drivers/usb/storage/usb.c +++ b/drivers/usb/storage/usb.c @@ -373,8 +373,12 @@ static int usb_stor_control_thread(void * __us) /* lock access to the state */ scsi_lock(host); + /* did the command already complete because of a disconnect? */ + if (!us->srb) + ; /* nothing to do */ + /* indicate that the command is done */ - if (us->srb->result != DID_ABORT << 16) { + else if (us->srb->result != DID_ABORT << 16) { US_DEBUGP("scsi cmd done, result=0x%x\n", us->srb->result); us->srb->scsi_done(us->srb); @@ -836,32 +840,34 @@ static void dissociate_dev(struct us_data *us) * the host */ static void quiesce_and_remove_host(struct us_data *us) { + struct Scsi_Host *host = us_to_host(us); + /* Prevent new USB transfers, stop the current command, and * interrupt a SCSI-scan or device-reset delay */ + scsi_lock(host); set_bit(US_FLIDX_DISCONNECTING, &us->flags); + scsi_unlock(host); usb_stor_stop_transport(us); wake_up(&us->delay_wait); /* It doesn't matter if the SCSI-scanning thread is still running. * The thread will exit when it sees the DISCONNECTING flag. */ - /* Wait for the current command to finish, then remove the host */ - mutex_lock(&us->dev_mutex); - mutex_unlock(&us->dev_mutex); - /* queuecommand won't accept any new commands and the control * thread won't execute a previously-queued command. If there * is such a command pending, complete it with an error. */ + mutex_lock(&us->dev_mutex); if (us->srb) { us->srb->result = DID_NO_CONNECT << 16; - scsi_lock(us_to_host(us)); + scsi_lock(host); us->srb->scsi_done(us->srb); us->srb = NULL; - scsi_unlock(us_to_host(us)); + scsi_unlock(host); } + mutex_unlock(&us->dev_mutex); /* Now we own no commands so it's safe to remove the SCSI host */ - scsi_remove_host(us_to_host(us)); + scsi_remove_host(host); } /* Second stage of disconnect processing: deallocate all resources */