On Tue, Mar 03, 2020 at 02:07:32PM +0300, Cengiz Can wrote:
> Added a reassignment into the NULL check block to fix the issue.
>
> Fixes: c780e86dd48 ("blktrace: Protect q->blk_trace with RCU")
>
> Signed-off-by: Cengiz Can <cengiz@xxxxxxxxxx>
> ---
> kernel/trace/blktrace.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index 4560878f0bac..29ea88f10b87 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -1896,8 +1896,10 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
> }
>
> ret = 0;
> - if (bt == NULL)
> + if (bt == NULL) {
> ret = blk_trace_setup_queue(q, bdev);
> + bt = q->blk_trace;
> + }
>
> if (ret == 0) {
> if (attr == &dev_attr_act_mask)
> --
> 2.25.1
>
<formletter>
This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.
</formletter>
