5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Gunthorpe <jgg@nvidia.com>

[ Upstream commit 723a2cc8d69d4342b47dfddbfe6c19f1b135f09b ]

The signature for __iowrite64_copy() requires the number of 64 bit
quantities, not bytes. Multiple by 8 to get to a byte length before
invoking zpci_memcpy_toio()

Fixes: 87bc359b9822 ("s390/pci: speed up __iowrite64_copy by using pci store block insn")
Acked-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/0-v1-9223d11a7662+1d7785-s390_iowrite64_jgg@nvidia.com (local)
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/s390/pci/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 74799439b2598..beecc36c30276 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c

@@ -225,7 +225,7 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 /* combine single writes by using store-block insn */
 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
 {
-       zpci_memcpy_toio(to, from, count);
+	zpci_memcpy_toio(to, from, count * 8);
 }
 
 static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)

-- 
2.43.0