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usb: xhci: move slot_id from xhci_hcd to xhci_command structure 

xhci->slot_id is used for providing a way to pass slot id from the
command completion handler to the function waiting for completion.
It's shared by enumerations of all USB devices connected to an
xhci host. Hence, it's a source for possible races. Since we've
introduced command structure and the command queue to xhci driver.
It's better to move slot_id from xhci_hcd structure to xhci_command
structure. Hence the race source is removed.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lu Baolu 2016-11-11 15:13:31 +02:00 committed by Greg Kroah-Hartman
parent 87e44f2aac
commit c2d3d49bba
3 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/usb/host/xhci-ring.c
View File

@ -1092,12 +1092,12 @@ static void xhci_handle_cmd_reset_ep(struct xhci_hcd *xhci, int slot_id,
}
static void xhci_handle_cmd_enable_slot(struct xhci_hcd *xhci, int slot_id,
u32 cmd_comp_code)
struct xhci_command *command, u32 cmd_comp_code)
{
if (cmd_comp_code == COMP_SUCCESS)
xhci->slot_id = slot_id;
command->slot_id = slot_id;
else
xhci->slot_id = 0;
command->slot_id = 0;
}
static void xhci_handle_cmd_disable_slot(struct xhci_hcd *xhci, int slot_id)
@ -1366,7 +1366,7 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
cmd_type = TRB_FIELD_TO_TYPE(le32_to_cpu(cmd_trb->generic.field[3]));
switch (cmd_type) {
case TRB_ENABLE_SLOT:
xhci_handle_cmd_enable_slot(xhci, slot_id, cmd_comp_code);
xhci_handle_cmd_enable_slot(xhci, slot_id, cmd, cmd_comp_code);
break;
case TRB_DISABLE_SLOT:
xhci_handle_cmd_disable_slot(xhci, slot_id);

2
drivers/usb/host/xhci.c
View File

@ -3706,7 +3706,7 @@ int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
spin_unlock_irqrestore(&xhci->lock, flags);
wait_for_completion(command->completion);
slot_id = xhci->slot_id;
slot_id = command->slot_id;
mutex_unlock(&xhci->mutex);
if (!slot_id || command->status != COMP_SUCCESS) {

2
drivers/usb/host/xhci.h
View File

@ -791,6 +791,7 @@ struct xhci_command {
/* Input context for changing device state */
struct xhci_container_ctx *in_ctx;
u32 status;
int slot_id;
/* If completion is null, no one is waiting on this command
* and the structure can be freed after the command completes.
*/
@ -1584,7 +1585,6 @@ struct xhci_hcd {
/* slot enabling and address device helpers */
/* these are not thread safe so use mutex */
struct mutex mutex;
int slot_id;
/* For USB 3.0 LPM enable/disable. */
struct xhci_command *lpm_command;
/* Internal mirror of the HW's dcbaa */