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xhci: Use delayed_work instead of timer for command timeout 

This is preparation to fix abort operation race (See "xhci: Fix race
related to abort operation"). To make timeout sleepable, use
delayed_work instead of timer.

[change a newly added pending timer fix to pending work -Mathias]
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
OGAWA Hirofumi 2017-01-03 18:28:50 +02:00 committed by Greg Kroah-Hartman
parent 4dea70778c
commit cb4d5ce588
3 changed files with 21 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/usb/host/xhci-mem.c
View File

@ -1829,7 +1829,7 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
int size;
int i, j, num_ports;
del_timer_sync(&xhci->cmd_timer);
cancel_delayed_work_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);
@ -2376,9 +2376,8 @@ 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);
/* init command timeout work */
INIT_DELAYED_WORK(&xhci->cmd_timer, xhci_handle_command_timeout);
page_size = readl(&xhci->op_regs->page_size);
xhci_dbg_trace(xhci, trace_xhci_dbg_init,

26
drivers/usb/host/xhci-ring.c
View File

@ -279,6 +279,11 @@ void xhci_ring_cmd_db(struct xhci_hcd *xhci)
readl(&xhci->dba->doorbell[0]);
}
static bool xhci_mod_cmd_timer(struct xhci_hcd *xhci, unsigned long delay)
{
return mod_delayed_work(system_wq, &xhci->cmd_timer, delay);
}
static int xhci_abort_cmd_ring(struct xhci_hcd *xhci)
{
u64 temp_64;
@ -295,7 +300,7 @@ static int xhci_abort_cmd_ring(struct xhci_hcd *xhci)
* but the completion event in never sent. Use the cmd timeout timer to
* handle those cases. Use twice the time to cover the bit polling retry
*/
mod_timer(&xhci->cmd_timer, jiffies + (2 * XHCI_CMD_DEFAULT_TIMEOUT));
xhci_mod_cmd_timer(xhci, 2 * XHCI_CMD_DEFAULT_TIMEOUT);
xhci_write_64(xhci, temp_64 | CMD_RING_ABORT,
&xhci->op_regs->cmd_ring);
@ -320,7 +325,7 @@ static int xhci_abort_cmd_ring(struct xhci_hcd *xhci)
xhci_err(xhci, "Stopped the command ring failed, "
"maybe the host is dead\n");
del_timer(&xhci->cmd_timer);
cancel_delayed_work(&xhci->cmd_timer);
xhci->xhc_state |= XHCI_STATE_DYING;
xhci_halt(xhci);
return -ESHUTDOWN;
@ -1251,21 +1256,22 @@ static void xhci_handle_stopped_cmd_ring(struct xhci_hcd *xhci,
if ((xhci->cmd_ring->dequeue != xhci->cmd_ring->enqueue) &&
!(xhci->xhc_state & XHCI_STATE_DYING)) {
xhci->current_cmd = cur_cmd;
mod_timer(&xhci->cmd_timer, jiffies + XHCI_CMD_DEFAULT_TIMEOUT);
xhci_mod_cmd_timer(xhci, XHCI_CMD_DEFAULT_TIMEOUT);
xhci_ring_cmd_db(xhci);
}
return;
}
void xhci_handle_command_timeout(unsigned long data)
void xhci_handle_command_timeout(struct work_struct *work)
{
struct xhci_hcd *xhci;
int ret;
unsigned long flags;
u64 hw_ring_state;
bool second_timeout = false;
xhci = (struct xhci_hcd *) data;
xhci = container_of(to_delayed_work(work), struct xhci_hcd, cmd_timer);
spin_lock_irqsave(&xhci->lock, flags);
@ -1273,7 +1279,7 @@ void xhci_handle_command_timeout(unsigned long data)
* If timeout work is pending, or current_cmd is NULL, it means we
* raced with command completion. Command is handled so just return.
*/
if (!xhci->current_cmd || timer_pending(&xhci->cmd_timer)) {
if (!xhci->current_cmd || delayed_work_pending(&xhci->cmd_timer)) {
spin_unlock_irqrestore(&xhci->lock, flags);
return;
}
@ -1346,7 +1352,7 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
cmd = list_entry(xhci->cmd_list.next, struct xhci_command, cmd_list);
del_timer(&xhci->cmd_timer);
cancel_delayed_work(&xhci->cmd_timer);
trace_xhci_cmd_completion(cmd_trb, (struct xhci_generic_trb *) event);
@ -1437,7 +1443,7 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
if (cmd->cmd_list.next != &xhci->cmd_list) {
xhci->current_cmd = list_entry(cmd->cmd_list.next,
struct xhci_command, cmd_list);
mod_timer(&xhci->cmd_timer, jiffies + XHCI_CMD_DEFAULT_TIMEOUT);
xhci_mod_cmd_timer(xhci, XHCI_CMD_DEFAULT_TIMEOUT);
} else if (xhci->current_cmd == cmd) {
xhci->current_cmd = NULL;
}
@ -3808,9 +3814,9 @@ static int queue_command(struct xhci_hcd *xhci, struct xhci_command *cmd,
/* if there are no other commands queued we start the timeout timer */
if (xhci->cmd_list.next == &cmd->cmd_list &&
!timer_pending(&xhci->cmd_timer)) {
!delayed_work_pending(&xhci->cmd_timer)) {
xhci->current_cmd = cmd;
mod_timer(&xhci->cmd_timer, jiffies + XHCI_CMD_DEFAULT_TIMEOUT);
xhci_mod_cmd_timer(xhci, XHCI_CMD_DEFAULT_TIMEOUT);
}
queue_trb(xhci, xhci->cmd_ring, false, field1, field2, field3,

4
drivers/usb/host/xhci.h
View File

@ -1568,7 +1568,7 @@ struct xhci_hcd {
#define CMD_RING_STATE_STOPPED (1 << 2)
struct list_head cmd_list;
unsigned int cmd_ring_reserved_trbs;
struct timer_list cmd_timer;
struct delayed_work cmd_timer;
struct xhci_command *current_cmd;
struct xhci_ring *event_ring;
struct xhci_erst erst;
@ -1934,7 +1934,7 @@ void xhci_queue_config_ep_quirk(struct xhci_hcd *xhci,
unsigned int slot_id, unsigned int ep_index,
struct xhci_dequeue_state *deq_state);
void xhci_stop_endpoint_command_watchdog(unsigned long arg);
void xhci_handle_command_timeout(unsigned long data);
void xhci_handle_command_timeout(struct work_struct *work);
void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id,
unsigned int ep_index, unsigned int stream_id);