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List: linux-usb
Subject: Re: [PATCH] gadget: Fix a sleep-in-atomic bug
From: Michal Nazarewicz <mina86 () mina86 ! com>
Date: 2017-05-31 10:57:33
Message-ID: xa1tefv5qoo2.fsf () mina86 ! com
[Download RAW message or body]
On Wed, May 31 2017, Jia-Ju Bai wrote:
> The driver may sleep under a spin lock, and the function call path is:
> ffs_epfile_io (acquire the lock by spin_lock_irq)
> usb_ep_alloc_request(GFP_KERNEL) --> may sleep
>
> To fix it, the "GFP_KERNEL" is replaced with "GFP_ATOMIC".
>
> Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
> ---
> drivers/usb/gadget/function/f_fs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
> index 47dda34..be90e25 100644
> --- a/drivers/usb/gadget/function/f_fs.c
> +++ b/drivers/usb/gadget/function/f_fs.c
> @@ -1015,7 +1015,7 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
> else
> ret = ep->status;
> goto error_mutex;
> - } else if (!(req = usb_ep_alloc_request(ep->ep, GFP_KERNEL))) {
> + } else if (!(req = usb_ep_alloc_request(ep->ep, GFP_ATOMIC))) {
> ret = -ENOMEM;
> } else {
> req->buf = data;
--
Best regards
γγγ¦ "πΆπ²π·πͺ86" γγΆγ¬γ΄γ€γ
«If at first you don't succeed, give up skydiving »
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