RDMA/siw: Pass a pointer to virt_to_page()

[ Upstream commit 0d1b756acf60da5004c1e20ca4462f0c257bf6e1 ]

Functions that work on a pointer to virtual memory such as
virt_to_pfn() and users of that function such as
virt_to_page() are supposed to pass a pointer to virtual
memory, ideally a (void *) or other pointer. However since
many architectures implement virt_to_pfn() as a macro,
this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

If we instead implement a proper virt_to_pfn(void *addr)
function the following happens (occurred on arch/arm):

drivers/infiniband/sw/siw/siw_qp_tx.c:32:23: warning: incompatible
  integer to pointer conversion passing 'dma_addr_t' (aka 'unsigned int')
  to parameter of type 'const void *' [-Wint-conversion]
drivers/infiniband/sw/siw/siw_qp_tx.c:32:37: warning: passing argument
  1 of 'virt_to_pfn' makes pointer from integer without a cast
  [-Wint-conversion]
drivers/infiniband/sw/siw/siw_qp_tx.c:538:36: warning: incompatible
  integer to pointer conversion passing 'unsigned long long'
  to parameter of type 'const void *' [-Wint-conversion]

Fix this with an explicit cast. In one case where the SIW
SGE uses an unaligned u64 we need a double cast modifying the
virtual address (va) to a platform-specific uintptr_t before
casting to a (void *).

Fixes: b9be6f18cf9e ("rdma/siw: transmit path")
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220902215918.603761-1-linus.walleij@linaro.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/sw/siw/siw_qp_tx.c b/drivers/infiniband/sw/siw/siw_qp_tx.c
index 1f4e60257700ef4dffff91a81f3305569c45ebb1..7d47b521070b1b73d69a8822d45a6e879489e669 100644 (file)
--- a/drivers/infiniband/sw/siw/siw_qp_tx.c
+++ b/drivers/infiniband/sw/siw/siw_qp_tx.c
@@ -29,7 +29,7 @@ static struct page *siw_get_pblpage(struct siw_mem *mem, u64 addr, int *idx)
        dma_addr_t paddr = siw_pbl_get_buffer(pbl, offset, NULL, idx);
 
        if (paddr)
-               return virt_to_page(paddr);
+               return virt_to_page((void *)paddr);
 
        return NULL;
 }
@@ -533,13 +533,23 @@ static int siw_tx_hdt(struct siw_iwarp_tx *c_tx, struct socket *s)
                                        kunmap_local(kaddr);
                                }
                        } else {
-                               u64 va = sge->laddr + sge_off;
+                               /*
+                                * Cast to an uintptr_t to preserve all 64 bits
+                                * in sge->laddr.
+                                */
+                               uintptr_t va = (uintptr_t)(sge->laddr + sge_off);
 
-                               page_array[seg] = virt_to_page(va & PAGE_MASK);
+                               /*
+                                * virt_to_page() takes a (void *) pointer
+                                * so cast to a (void *) meaning it will be 64
+                                * bits on a 64 bit platform and 32 bits on a
+                                * 32 bit platform.
+                                */
+                               page_array[seg] = virt_to_page((void *)(va & PAGE_MASK));
                                if (do_crc)
                                        crypto_shash_update(
                                                c_tx->mpa_crc_hd,
-                                               (void *)(uintptr_t)va,
+                                               (void *)va,
                                                plen);
                        }