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    Subject[PATCH v2 3/4] s390/block/dcssblk: check the validity of the pointer pfn
    Date
    From: Huaisheng Ye <yehs1@lenovo.com>

    direct_access needs to check the validity of pointer pfn for NULL
    assignment. If pfn equals to NULL, it doesn't need to calculate the value.

    Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
    Reviewed-by: Jan Kara <jack@suse.cz>
    ---
    drivers/s390/block/dcssblk.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
    index 0a312e4..5cdfa02 100644
    --- a/drivers/s390/block/dcssblk.c
    +++ b/drivers/s390/block/dcssblk.c
    @@ -916,7 +916,8 @@ static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show,

    dev_sz = dev_info->end - dev_info->start + 1;
    *kaddr = (void *) dev_info->start + offset;
    - *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset),
    + if (pfn)
    + *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset),
    PFN_DEV|PFN_SPECIAL);

    return (dev_sz - offset) / PAGE_SIZE;
    --
    1.8.3.1

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