diff options
| author | Dave Olson <dave.olson@qlogic.com> | 2008-12-05 11:14:38 -0800 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2008-12-05 11:14:38 -0800 |
| commit | 3d0890985ac4dff781b7feba19fedda547314749 (patch) | |
| tree | 4e18e4e70c32abf9450c223db97affb1d05dbeeb /drivers/infiniband/hw/ipath/ipath_file_ops.c | |
| parent | 1bf7724e093cf3071d943d53bfa4de8b8e50426b (diff) | |
IB/ipath: Add locking for interrupt use of ipath_pd contexts vs free
Fixes timing race resulting in panic. Not a performance sensitive path.
Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_file_ops.c')
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_file_ops.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_file_ops.c b/drivers/infiniband/hw/ipath/ipath_file_ops.c index ceab52c09cdb..239d4e8068ac 100644 --- a/drivers/infiniband/hw/ipath/ipath_file_ops.c +++ b/drivers/infiniband/hw/ipath/ipath_file_ops.c @@ -2046,7 +2046,9 @@ static int ipath_close(struct inode *in, struct file *fp) struct ipath_filedata *fd; struct ipath_portdata *pd; struct ipath_devdata *dd; + unsigned long flags; unsigned port; + struct pid *pid; ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n", (long)in->i_rdev, fp->private_data); @@ -2079,14 +2081,13 @@ static int ipath_close(struct inode *in, struct file *fp) mutex_unlock(&ipath_mutex); goto bail; } + /* early; no interrupt users after this */ + spin_lock_irqsave(&dd->ipath_uctxt_lock, flags); port = pd->port_port; - - if (pd->port_hdrqfull) { - ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors " - "during run\n", pd->port_comm, pid_nr(pd->port_pid), - pd->port_hdrqfull); - pd->port_hdrqfull = 0; - } + dd->ipath_pd[port] = NULL; + pid = pd->port_pid; + pd->port_pid = NULL; + spin_unlock_irqrestore(&dd->ipath_uctxt_lock, flags); if (pd->port_rcvwait_to || pd->port_piowait_to || pd->port_rcvnowait || pd->port_pionowait) { @@ -2143,13 +2144,11 @@ static int ipath_close(struct inode *in, struct file *fp) unlock_expected_tids(pd); ipath_stats.sps_ports--; ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n", - pd->port_comm, pid_nr(pd->port_pid), + pd->port_comm, pid_nr(pid), dd->ipath_unit, port); } - put_pid(pd->port_pid); - pd->port_pid = NULL; - dd->ipath_pd[pd->port_port] = NULL; /* before releasing mutex */ + put_pid(pid); mutex_unlock(&ipath_mutex); ipath_free_pddata(dd, pd); /* after releasing the mutex */ |