From: Roger Quadros <roger.quadros@xxxxxxxxx>
Defer the SET_CONFIG and SET_INTERFACE control transfer's data/status
stages till we are ready to process new CBW from the host. This way we
ensure that we don't loose any CBW during MSC compliance tests and cause
lock up.
Signed-off-by: Roger Quadros <roger.quadros@xxxxxxxxx>
Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/gadget/f_mass_storage.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 01ae27b..ad96be8 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -347,6 +347,7 @@ struct fsg_operations {
/* Data shared by all the FSG instances. */
struct fsg_common {
struct usb_gadget *gadget;
+ struct usb_composite_dev *cdev;
struct fsg_dev *fsg, *new_fsg;
wait_queue_head_t fsg_wait;
@@ -2441,7 +2442,7 @@ static int fsg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
struct fsg_dev *fsg = fsg_from_func(f);
fsg->common->new_fsg = fsg;
raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE);
- return 0;
+ return USB_GADGET_DELAYED_STATUS;
}
static void fsg_disable(struct usb_function *f)
@@ -2577,6 +2578,8 @@ static void handle_exception(struct fsg_common *common)
case FSG_STATE_CONFIG_CHANGE:
do_set_interface(common, common->new_fsg);
+ if (common->new_fsg)
+ usb_composite_setup_continue(common->cdev);
break;
case FSG_STATE_EXIT:
@@ -2747,6 +2750,7 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
common->gadget = gadget;
common->ep0 = gadget->ep0;
common->ep0req = cdev->req;
+ common->cdev = cdev;
/* Maybe allocate device-global string IDs, and patch descriptors */
if (fsg_strings[FSG_STRING_INTERFACE].id == 0) {
--
1.7.4.2
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