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FROMGIT: usb: gadget: f_mass_storage: Disable eps during disconnect

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When receiving a disconnect event from the UDC, the mass storage
function driver currently runs the handle_exception() routine
asynchronously.  For UDCs that support runtime PM, there is a
possibility the UDC is already suspended by the time the
do_set_interface() is executed.  This can lead to HW register access
while the UDC is already suspended.

Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>

Bug: 204343836
(cherry picked from commit 9fff139aeb
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing)
Change-Id: I6c8011baddf02d6b0eadb5934416bc24b8a93f4a
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
This commit is contained in:
Wesley Cheng
2021-10-27 13:00:37 -07:00
committed by Todd Kjos
parent cde1d53cc9
commit 8c9d9d8e44
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/gadget/function/f_mass_storage.c
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@@ -2301,6 +2301,16 @@ static void fsg_disable(struct usb_function *f)
{
struct fsg_dev *fsg = fsg_from_func(f);
/* Disable the endpoints */
if (fsg->bulk_in_enabled) {
usb_ep_disable(fsg->bulk_in);
fsg->bulk_in_enabled = 0;
}
if (fsg->bulk_out_enabled) {
usb_ep_disable(fsg->bulk_out);
fsg->bulk_out_enabled = 0;
}
__raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE, NULL);
}