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hvcs: Ensure page aligned partner info buffer

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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>
This commit is contained in:
Brian King 2011-09-13 11:22:51 +00:00 • committed by Benjamin Herrenschmidt
parent 8bdafa39a4
commit ac07a4a57f
1 changed files with 3 additions and 3 deletions
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6
drivers/tty/hvc/hvcs.c
View file

@ -1532,7 +1532,7 @@ static int __devinit hvcs_initialize(void)
goto register_fail; 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) { if (!hvcs_pi_buff) {
rc = -ENOMEM; rc = -ENOMEM;
goto buff_alloc_fail; goto buff_alloc_fail;
@ -1548,7 +1548,7 @@ static int __devinit hvcs_initialize(void)
return 0; return 0;
kthread_fail: kthread_fail:
kfree(hvcs_pi_buff); free_page((unsigned long)hvcs_pi_buff);
buff_alloc_fail: buff_alloc_fail:
tty_unregister_driver(hvcs_tty_driver); tty_unregister_driver(hvcs_tty_driver);
register_fail: register_fail:
@ -1597,7 +1597,7 @@ static void __exit hvcs_module_exit(void)
kthread_stop(hvcs_task); kthread_stop(hvcs_task);
spin_lock(&hvcs_pi_lock); spin_lock(&hvcs_pi_lock);
kfree(hvcs_pi_buff); free_page((unsigned long)hvcs_pi_buff);
hvcs_pi_buff = NULL; hvcs_pi_buff = NULL;
spin_unlock(&hvcs_pi_lock); spin_unlock(&hvcs_pi_lock);