Dear Maintainers of Linux-s390, Greetings. May I have your ack's for this patch? The whole series would be applied to libnvdimm if it could get your approval. And any suggestion is welcome. Cheers, Huaisheng Ye > From: Huaisheng Ye <yehs2007@xxxxxxxx> > Sent: Thursday, July 26, 2018 12:29 AM > > From: Huaisheng Ye <yehs1@xxxxxxxxxx> > > dcssblk_direct_access() needs to check the validity of pointers kaddr > and pfn for NULL assignment. If anyone equals to NULL, it doesn't need > to calculate the value. > > If either of them is equal to NULL, that is to say callers may > have no need for kaddr or pfn, so this patch is prepared for allowing > them to pass in NULL instead of having to pass in a pointer or local > variable that they then just throw away. > > Signed-off-by: Huaisheng Ye <yehs1@xxxxxxxxxx> > --- > drivers/s390/block/dcssblk.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c > index ed60728..23e526c 100644 > --- a/drivers/s390/block/dcssblk.c > +++ b/drivers/s390/block/dcssblk.c > @@ -922,9 +922,11 @@ static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, > unsigned long dev_sz; > > 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), > - PFN_DEV|PFN_SPECIAL); > + if (kaddr) > + *kaddr = (void *) 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 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
