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Date: Tue, 10 Mar 2020 13:37:43 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Michal Nazarewicz <mina86@...a86.com>, Lars-Peter Clausen <lars@...afoo.de>, Alexandru Ardelean <alexandru.ardelean@...log.com>, Felipe Balbi <balbi@...nel.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.4 017/168] usb: gadget: ffs: ffs_aio_cancel(): Save/restore IRQ flags From: Lars-Peter Clausen <lars@...afoo.de> [ Upstream commit 43d565727a3a6fd24e37c7c2116475106af71806 ] ffs_aio_cancel() can be called from both interrupt and thread context. Make sure that the current IRQ state is saved and restored by using spin_{un,}lock_irq{save,restore}(). Otherwise undefined behavior might occur. Acked-by: Michal Nazarewicz <mina86@...a86.com> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com> Signed-off-by: Felipe Balbi <balbi@...nel.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/usb/gadget/function/f_fs.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index ced2581cf99fe..a9a711e046148 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -1162,18 +1162,19 @@ static int ffs_aio_cancel(struct kiocb *kiocb) { struct ffs_io_data *io_data = kiocb->private; struct ffs_epfile *epfile = kiocb->ki_filp->private_data; + unsigned long flags; int value; ENTER(); - spin_lock_irq(&epfile->ffs->eps_lock); + spin_lock_irqsave(&epfile->ffs->eps_lock, flags); if (likely(io_data && io_data->ep && io_data->req)) value = usb_ep_dequeue(io_data->ep, io_data->req); else value = -EINVAL; - spin_unlock_irq(&epfile->ffs->eps_lock); + spin_unlock_irqrestore(&epfile->ffs->eps_lock, flags); return value; } -- 2.20.1
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