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USB: f_fs: Disable USB LPM on bus_suspend with ADB

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ADB function is mainly used for debugging, hence it is
not expected to allow USB LPM followed by system suspend
in device bus suspend. Driver also doesn't handle
usb_ep_dequeue failure in LPM when adbd is interrupted
by signal as buffer is left queued to the hardware after
usb_ep_dequeue failure and can cause memory corruption.

Change-Id: Ib89c80318dcdd0dbb35d122a2ab77fb61f83518e
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
This commit is contained in:
Manu Gautam 2015-12-29 22:25:36 +05:30 • committed by David Keitel
parent 0ede2f03b1
commit 3d2c84e2f1
1 changed files with 10 additions and 1 deletions
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11
drivers/usb/gadget/function/f_fs.c
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@ -3073,14 +3073,23 @@ static int ffs_func_set_alt(struct usb_function *f,
ffs->func = func;
ret = ffs_func_eps_enable(func);
if (likely(ret >= 0))
if (likely(ret >= 0)) {
ffs_event_add(ffs, FUNCTIONFS_ENABLE);
/* Disable USB LPM later on bus_suspend */
usb_gadget_autopm_get_async(ffs->gadget);
}
return ret;
}
static void ffs_func_disable(struct usb_function *f)
{
struct ffs_function *func = ffs_func_from_usb(f);
struct ffs_data *ffs = func->ffs;
ffs_func_set_alt(f, 0, (unsigned)-1);
/* matching put to allow LPM on disconnect */
usb_gadget_autopm_put_async(ffs->gadget);
}
static int ffs_func_setup(struct usb_function *f,