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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.

Change-Id: Ie1374cb7c895bd9d5c0129dd18886980dba71712
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/1635365407-31337-3-git-send-email-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 9fff139aeb11186fd8e75860c959c86cb43ab2f6
Git-Repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Rohith Kollalsi <quic_rkollals@quicinc.com>
This commit is contained in:
Wesley Cheng 2021-10-27 13:10:07 -07:00 • committed by Gerrit - the friendly Code Review server
commit e326bb5942
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/gadget/function/f_mass_storage.c
View file

@ -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);
}