diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2020-01-16 15:29:01 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-11 07:53:09 +0100 |
| commit | f0db53e7241446b58f6fd868287e9b128eeced21 (patch) | |
| tree | 6a420603e74ccb7c74cc27268f0448c6baf528f2 /drivers/usb | |
| parent | 6596754b90c5bc4ec33c2d68bf95ecabf5167b16 (diff) | |
usb: gadget: ffs: ffs_aio_cancel(): Save/restore IRQ flags
[ 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@mina86.com>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/function/f_fs.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index d1278d2d544b..b5747f1270a6 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -1077,18 +1077,19 @@ 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; } |