From 1117ef8aed95521f46dae3052c7120baae48c2bb Mon Sep 17 00:00:00 2001 From: Brian King Date: Thu, 17 Jun 2010 13:56:02 -0500 Subject: [SCSI] ibmvscsi: Fix error path deadlock Fixes a deadlock that can occur if we hit a command timeout during the virtual adapter initialization. The event done functions are written with the assumption that no locks are held, however, when purging requests this is not true. Fix up the purge function to drop the lock so that the done function is not called with the lock held, which can cause a deadlock. Signed-off-by: Brian King Signed-off-by: James Bottomley --- drivers/scsi/ibmvscsi/ibmvscsi.c | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) (limited to 'drivers/scsi/ibmvscsi') diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index e50fad9..83b5a17 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -474,23 +474,26 @@ static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, */ static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) { - struct srp_event_struct *tmp_evt, *pos; + struct srp_event_struct *evt; unsigned long flags; spin_lock_irqsave(hostdata->host->host_lock, flags); - list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { - list_del(&tmp_evt->list); - del_timer(&tmp_evt->timer); - if (tmp_evt->cmnd) { - tmp_evt->cmnd->result = (error_code << 16); - unmap_cmd_data(&tmp_evt->iu.srp.cmd, - tmp_evt, - tmp_evt->hostdata->dev); - if (tmp_evt->cmnd_done) - tmp_evt->cmnd_done(tmp_evt->cmnd); - } else if (tmp_evt->done) - tmp_evt->done(tmp_evt); - free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); + while (!list_empty(&hostdata->sent)) { + evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); + list_del(&evt->list); + del_timer(&evt->timer); + + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + if (evt->cmnd) { + evt->cmnd->result = (error_code << 16); + unmap_cmd_data(&evt->iu.srp.cmd, evt, + evt->hostdata->dev); + if (evt->cmnd_done) + evt->cmnd_done(evt->cmnd); + } else if (evt->done) + evt->done(evt); + free_event_struct(&evt->hostdata->pool, evt); + spin_lock_irqsave(hostdata->host->host_lock, flags); } spin_unlock_irqrestore(hostdata->host->host_lock, flags); } -- cgit v1.1