From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:42242 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754122AbbJRCUt (ORCPT ); Sat, 17 Oct 2015 22:20:49 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Oliver Neukum , Mathias Nyman Subject: [PATCH 4.2 161/258] xhci: init command timeout timer earlier to avoid deleting it uninitialized Date: Sat, 17 Oct 2015 18:57:54 -0700 Message-Id: <20151018014737.747148699@linuxfoundation.org> In-Reply-To: <20151018014729.976101177@linuxfoundation.org> References: <20151018014729.976101177@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: stable-owner@vger.kernel.org List-ID: 4.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Nyman commit cc8e4fc0c3b5e8340bc8358990515d116a3c274c upstream. 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. Reported-by: Oliver Neukum Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-mem.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) --- 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 *x 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, 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, "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).