Messages in this thread Patch in this message | | | From | Huaisheng Ye <> | Subject | [PATCH v2 3/4] s390/block/dcssblk: check the validity of the pointer pfn | Date | Thu, 5 Jul 2018 00:38:22 +0800 |
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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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