[PATCH 06/26] vmw_vmci: Convert driver to use get_user_pages_fast()

[Jan Kara]

Convert vmci_host_setup_notify() and qp_host_get_user_memory() to use
get_user_pages_fast() instead of get_user_pages(). Note that
qp_host_get_user_memory() was using mmap_sem for writing without an
apparent reason.

CC: Arnd Bergmann <a...@arndb.de>
CC: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Jan Kara <j...@suse.cz>
---
 drivers/misc/vmw_vmci/vmci_host.c       |  6 +-----
 drivers/misc/vmw_vmci/vmci_queue_pair.c | 21 ++++++---------------
 2 files changed, 7 insertions(+), 20 deletions(-)

diff --git a/drivers/misc/vmw_vmci/vmci_host.c 
b/drivers/misc/vmw_vmci/vmci_host.c
index d4722b3dc8ec..1723a6e4f2e8 100644
--- a/drivers/misc/vmw_vmci/vmci_host.c
+++ b/drivers/misc/vmw_vmci/vmci_host.c
@@ -243,11 +243,7 @@ static int vmci_host_setup_notify(struct vmci_ctx *context,
        /*
         * Lock physical page backing a given user VA.
         */
-       down_read(&current->mm->mmap_sem);
-       retval = get_user_pages(current, current->mm,
-                               PAGE_ALIGN(uva),
-                               1, 1, 0, &page, NULL);
-       up_read(&current->mm->mmap_sem);
+       retval = get_user_pages_fast(PAGE_ALIGN(uva), 1, 1, &page);
        if (retval != 1)
                return VMCI_ERROR_GENERIC;
 
diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c 
b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index a0515a6d6ebd..1b7b303085d2 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -732,13 +732,9 @@ static int qp_host_get_user_memory(u64 produce_uva,
        int retval;
        int err = VMCI_SUCCESS;
 
-       down_write(&current->mm->mmap_sem);
-       retval = get_user_pages(current,
-                               current->mm,
-                               (uintptr_t) produce_uva,
-                               produce_q->kernel_if->num_pages,
-                               1, 0,
-                               produce_q->kernel_if->u.h.header_page, NULL);
+       retval = get_user_pages_fast((uintptr_t) produce_uva,
+                                    produce_q->kernel_if->num_pages, 1,
+                                    produce_q->kernel_if->u.h.header_page);
        if (retval < produce_q->kernel_if->num_pages) {
                pr_warn("get_user_pages(produce) failed (retval=%d)", retval);
                qp_release_pages(produce_q->kernel_if->u.h.header_page,
@@ -747,12 +743,9 @@ static int qp_host_get_user_memory(u64 produce_uva,
                goto out;
        }
 
-       retval = get_user_pages(current,
-                               current->mm,
-                               (uintptr_t) consume_uva,
-                               consume_q->kernel_if->num_pages,
-                               1, 0,
-                               consume_q->kernel_if->u.h.header_page, NULL);
+       retval = get_user_pages_fast((uintptr_t) consume_uva,
+                                    consume_q->kernel_if->num_pages, 1,
+                                    consume_q->kernel_if->u.h.header_page);
        if (retval < consume_q->kernel_if->num_pages) {
                pr_warn("get_user_pages(consume) failed (retval=%d)", retval);
                qp_release_pages(consume_q->kernel_if->u.h.header_page,
@@ -763,8 +756,6 @@ static int qp_host_get_user_memory(u64 produce_uva,
        }
 
  out:
-       up_write(&current->mm->mmap_sem);
-
        return err;
 }
 
-- 
1.8.1.4

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