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USB: u_ether: Prevent unclocked access when running rndis interface down

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When in rndis composition, if device is disabled in device manager,
usb enters low power mode. Then if rndis interface is put down,
ep_disable is called leading to crash due to unclocked access as
clocks are turned off when usb enters lpm. Fix this by waking up
the controller, then performing ep_disable operation and then
putting controller back to lpm.

Change-Id: I45d29ef2e2678a3d6383d3fdd5550c8b8e156875
Signed-off-by: Rohith Kollalsi <rkollals@codeaurora.org>
This commit is contained in:
Rohith Kollalsi 2021-09-06 20:27:24 +05:30 • committed by Gerrit - the friendly Code Review server
commit da0ce57aed
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/gadget/function/u_ether.c
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@ -650,6 +650,8 @@ static int eth_stop(struct net_device *net)
dev->net->stats.rx_errors, dev->net->stats.tx_errors
);
usb_gadget_autopm_get(dev->gadget);
/* ensure there are no more active requests */
spin_lock_irqsave(&dev->lock, flags);
if (dev->port_usb) {
@ -682,6 +684,7 @@ static int eth_stop(struct net_device *net)
}
}
spin_unlock_irqrestore(&dev->lock, flags);
usb_gadget_autopm_put_async(dev->gadget);
return 0;
}