diff options
| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2015-09-21 17:46:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-09-21 22:50:45 -0700 |
| commit | cc8e4fc0c3b5e8340bc8358990515d116a3c274c (patch) | |
| tree | bd4bb2013050a6fb63a3fd19cb67e7c68e7f8f32 | |
| parent | dca7794539eff04b786fb6907186989e5eaaa9c2 (diff) | |
| download | linux-cc8e4fc0c3b5e8340bc8358990515d116a3c274c.tar.gz linux-cc8e4fc0c3b5e8340bc8358990515d116a3c274c.tar.bz2 linux-cc8e4fc0c3b5e8340bc8358990515d116a3c274c.zip | |
xhci: init command timeout timer earlier to avoid deleting it uninitialized
Don't check if timer is running with a timer_pending() before
deleting it with del_timer_sync(), this defies the whole point of
the sync part and can cause a possible race.
Instead we just want to make sure the timer is initialized early enough
before we have a chance to delete it.
Cc: <stable@vger.kernel.org>
Reported-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/host/xhci-mem.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 8497fb8f6193..41f841fa6c4d 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1792,8 +1792,7 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci) int size; int i, j, num_ports; - if (timer_pending(&xhci->cmd_timer)) - del_timer_sync(&xhci->cmd_timer); + del_timer_sync(&xhci->cmd_timer); /* Free the Event Ring Segment Table and the actual Event Ring */ size = sizeof(struct xhci_erst_entry)*(xhci->erst.num_entries); @@ -2321,6 +2320,10 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) INIT_LIST_HEAD(&xhci->cmd_list); + /* init command timeout timer */ + setup_timer(&xhci->cmd_timer, xhci_handle_command_timeout, + (unsigned long)xhci); + page_size = readl(&xhci->op_regs->page_size); xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Supported page size register = 0x%x", page_size); @@ -2505,10 +2508,6 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) "Wrote ERST address to ir_set 0."); xhci_print_ir_set(xhci, 0); - /* init command timeout timer */ - setup_timer(&xhci->cmd_timer, xhci_handle_command_timeout, - (unsigned long)xhci); - /* * XXX: Might need to set the Interrupter Moderation Register to * something other than the default (~1ms minimum between interrupts). |