Re: [PATCH] usb: using mutex lock and supporting O_NONBLOCK flag in iowarrior_read()

[Greg KH <gregkh@linuxfoundation.org>]

On Wed, Sep 18, 2024 at 01:48:20AM +0900, Jeongjun Park wrote:
> iowarrior_read() uses the iowarrior dev structure, but does not use any 
> lock on the structure. This can cause various bugs including data-races,
> so it is more appropriate to use a mutex lock to safely protect the 
> iowarrior dev structure. When using a mutex lock, you should split the
> branch to prevent blocking when the O_NONBLOCK flag is set.
> 
> In addition, it is unnecessary to check for NULL on the iowarrior dev 
> structure obtained by reading file->private_data. Therefore, it is 
> better to remove the check.
> 
> Fixes: 946b960d13c1 ("USB: add driver for iowarrior devices.")
> Signed-off-by: Jeongjun Park <aha310510@gmail.com>
> ---
>  drivers/usb/misc/iowarrior.c | 46 ++++++++++++++++++++++++++++--------
>  1 file changed, 36 insertions(+), 10 deletions(-)

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
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