From: Konrad Rzeszutek Wilk Date: Tue, 31 Dec 2013 20:55:39 +0000 (-0500) Subject: xen/grants: Remove gnttab_max_grant_frames dependency on gnttab_init. X-Git-Tag: next-20140106~22^2^2~2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=20037b60e9f1a40b24c608fcedcb7b29e575bd92;p=karo-tx-linux.git 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 Reviewed-by: David Vrabel --- diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 3005c17bd170..2d271605bf63 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -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; @@ -1225,13 +1229,12 @@ 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 *),