From 930e99bd1320d78c7d8866595e81b8fc7dc8739b Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Tue, 13 Feb 2007 23:21:52 +0900 Subject: [SCSI] tgt: fix the user/kernel ring buffer interface This patches fixes two bugs in the scsi target infrastructure's user/kernel interface. - It wrongly assumes that the ring buffer size of the interface (64KB) is larger than or equal to the system page size. This patch sets the ring buffer size to PAGE_SIZE if the system page size is larger. - It uses PAGE_SIZE in the header file exported to userspace. This patch removes it. Signed-off-by: FUJITA Tomonori Signed-off-by: James Bottomley --- drivers/scsi/scsi_tgt_if.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/scsi') diff --git a/drivers/scsi/scsi_tgt_if.c b/drivers/scsi/scsi_tgt_if.c index f2344ab8deff..0e08817fdecf 100644 --- a/drivers/scsi/scsi_tgt_if.c +++ b/drivers/scsi/scsi_tgt_if.c @@ -33,6 +33,14 @@ #include "scsi_tgt_priv.h" +#if TGT_RING_SIZE < PAGE_SIZE +# define TGT_RING_SIZE PAGE_SIZE +#endif + +#define TGT_RING_PAGES (TGT_RING_SIZE >> PAGE_SHIFT) +#define TGT_EVENT_PER_PAGE (PAGE_SIZE / sizeof(struct tgt_event)) +#define TGT_MAX_EVENTS (TGT_EVENT_PER_PAGE * TGT_RING_PAGES) + struct tgt_ring { u32 tr_idx; unsigned long tr_pages[TGT_RING_PAGES]; -- cgit v1.2.3-59-g8ed1b