hvcs: Ensure page aligned partner info buffer

The Power platform requires the partner info buffer to be page aligned
otherwise it will fail the partner info hcall with H_PARAMETER. Switch
from using kmalloc to allocate this buffer to __get_free_page to ensure
page alignment.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index 4c8b665..3929166 100644 (file)
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -1532,7 +1532,7 @@ static int __devinit hvcs_initialize(void)
                goto register_fail;
        }
 
-       hvcs_pi_buff = kmalloc(PAGE_SIZE, GFP_KERNEL);
+       hvcs_pi_buff = (unsigned long *) __get_free_page(GFP_KERNEL);
        if (!hvcs_pi_buff) {
                rc = -ENOMEM;
                goto buff_alloc_fail;
@@ -1548,7 +1548,7 @@ static int __devinit hvcs_initialize(void)
        return 0;
 
 kthread_fail:
-       kfree(hvcs_pi_buff);
+       free_page((unsigned long)hvcs_pi_buff);
 buff_alloc_fail:
        tty_unregister_driver(hvcs_tty_driver);
 register_fail:
@@ -1597,7 +1597,7 @@ static void __exit hvcs_module_exit(void)
        kthread_stop(hvcs_task);
 
        spin_lock(&hvcs_pi_lock);
-       kfree(hvcs_pi_buff);
+       free_page((unsigned long)hvcs_pi_buff);
        hvcs_pi_buff = NULL;
        spin_unlock(&hvcs_pi_lock);