From 50d44f82c7f1b0d2676a7c5c11feb321e4ea6c44 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Mon, 2 Jul 2018 09:31:32 +0200 Subject: [PATCH] mfd: dln2: Use irqsave() in USB's complete callback The USB completion callback does not disable interrupts while acquiring the lock. We want to remove the local_irq_disable() invocation from __usb_hcd_giveback_urb() and therefore it is required for the callback handler to disable the interrupts while acquiring the lock. The callback may be invoked either in IRQ or BH context depending on the USB host controller. Use the _irqsave() variant of the locking primitives. Reviewed-by: Johan Hovold Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Lee Jones --- drivers/mfd/dln2.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c index 704e189ca162..90e789943466 100644 --- a/drivers/mfd/dln2.c +++ b/drivers/mfd/dln2.c @@ -194,6 +194,7 @@ static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb, struct device *dev = &dln2->interface->dev; struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; struct dln2_rx_context *rxc; + unsigned long flags; bool valid_slot = false; if (rx_slot >= DLN2_MAX_RX_SLOTS) @@ -201,18 +202,13 @@ static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb, rxc = &rxs->slots[rx_slot]; - /* - * No need to disable interrupts as this lock is not taken in interrupt - * context elsewhere in this driver. This function (or its callers) are - * also not exported to other modules. - */ - spin_lock(&rxs->lock); + spin_lock_irqsave(&rxs->lock, flags); if (rxc->in_use && !rxc->urb) { rxc->urb = urb; complete(&rxc->done); valid_slot = true; } - spin_unlock(&rxs->lock); + spin_unlock_irqrestore(&rxs->lock, flags); out: if (!valid_slot)