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xen/grants: Remove gnttab_max_grant_frames dependency on gnttab_init. 

The function gnttab_max_grant_frames() returns the maximum amount
of frames (pages) of grants we can have. Unfortunatly it was
dependent on gnttab_init() having been run before to initialize
the boot max value (boot_max_nr_grant_frames).

This meant that users of gnttab_max_grant_frames would always
get a zero value if they called before gnttab_init() - such as
'platform_pci_init' (drivers/xen/platform-pci.c).

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-12-31 15:55:39 -05:00
parent 2771374d47
commit 7f256020cc
1 changed files with 6 additions and 3 deletions
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9
drivers/xen/grant-table.c
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@ -62,7 +62,6 @@
static grant_ref_t **gnttab_list;
static unsigned int nr_grant_frames;
static unsigned int boot_max_nr_grant_frames;
static int gnttab_free_count;
static grant_ref_t gnttab_free_head;
static DEFINE_SPINLOCK(gnttab_list_lock);
@ -827,6 +826,11 @@ static unsigned int __max_nr_grant_frames(void)
unsigned int gnttab_max_grant_frames(void)
{
unsigned int xen_max = __max_nr_grant_frames();
static unsigned int boot_max_nr_grant_frames;
/* First time, initialize it properly. */
if (!boot_max_nr_grant_frames)
boot_max_nr_grant_frames = __max_nr_grant_frames();
if (xen_max > boot_max_nr_grant_frames)
return boot_max_nr_grant_frames;
@ -1227,13 +1231,12 @@ int gnttab_init(void)
gnttab_request_version();
nr_grant_frames = 1;
boot_max_nr_grant_frames = __max_nr_grant_frames();
/* Determine the maximum number of frames required for the
* grant reference free list on the current hypervisor.
*/
BUG_ON(grefs_per_grant_frame == 0);
max_nr_glist_frames = (boot_max_nr_grant_frames *
max_nr_glist_frames = (gnttab_max_grant_frames() *
grefs_per_grant_frame / RPP);
gnttab_list = kmalloc(max_nr_glist_frames * sizeof(grant_ref_t *),