On Sat, Oct 19, 2013 at 10:01:42PM +0530, Rashika Kheria wrote:
> This patch fixes the following Smatch warning in zram_drv.c-
> ~/git/kernels/linux/drivers/staging/zram/zram_drv.c:663
> reset_store() warn: variable dereferenced before check 'bdev' (see line 652)
> ~/git/kernels/linux/drivers/staging/zram/zram_drv.c:899
> destroy_device() warn: variable dereferenced before check 'zram->disk' (see
> line 896)
>
> Signed-off-by: Rashika Kheria <rashika.khe...@gmail.com>
zram is messy, tricky, and I hate it. Seriously, I which I had never
taken it into the staging tree...
Anyway, I want the existing zram developers/maintainers to review this
patch before I can accept it, as I don't trust anything that is ever
done in that code, especially as I don't test it :)
Minchan, Jiang, Nitin, what do you think of the patch below? Can I get
your ack on it so that I can apply it?
thanks,
greg k-h
> ---
>
> This revision fixes the following issues of the previous revision-
> Incorrect Correction of Sparse Warning
>
> drivers/staging/zram/zram_drv.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
> index 2c4ed52..a74108a 100644
> --- a/drivers/staging/zram/zram_drv.c
> +++ b/drivers/staging/zram/zram_drv.c
> @@ -660,8 +660,7 @@ static ssize_t reset_store(struct device *dev,
> return -EINVAL;
>
> /* Make sure all pending I/O is finished */
> - if (bdev)
> - fsync_bdev(bdev);
> + fsync_bdev(bdev);
>
> zram_reset_device(zram, true);
> return len;
> @@ -893,10 +892,9 @@ out:
>
> static void destroy_device(struct zram *zram)
> {
> - sysfs_remove_group(&disk_to_dev(zram->disk)->kobj,
> - &zram_disk_attr_group);
> -
> if (zram->disk) {
> + sysfs_remove_group(&disk_to_dev(zram->disk)->kobj,
> + &zram_disk_attr_group);
> del_gendisk(zram->disk);
> put_disk(zram->disk);
> }
> --
> 1.7.9.5
>
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