Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=930e99bd1320d78c7d8866595e81b8fc7dc8739b
Commit: 930e99bd1320d78c7d8866595e81b8fc7dc8739b
Parent: 8f3334edae93f8b664417f4140d4d9dc9a003fe4
Author: FUJITA Tomonori <[EMAIL PROTECTED]>
AuthorDate: Tue Feb 13 23:21:52 2007 +0900
Committer: James Bottomley <[EMAIL PROTECTED]>
CommitDate: Fri Feb 16 09:40:56 2007 -0600
[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 <[EMAIL PROTECTED]>
Signed-off-by: James Bottomley <[EMAIL PROTECTED]>
---
drivers/scsi/scsi_tgt_if.c | 8 ++++++++
include/scsi/scsi_tgt_if.h | 3 ---
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/scsi_tgt_if.c b/drivers/scsi/scsi_tgt_if.c
index f2344ab..0e08817 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];
diff --git a/include/scsi/scsi_tgt_if.h b/include/scsi/scsi_tgt_if.h
index 46d5e70..07d6e77 100644
--- a/include/scsi/scsi_tgt_if.h
+++ b/include/scsi/scsi_tgt_if.h
@@ -83,8 +83,5 @@ struct tgt_event {
} __attribute__ ((aligned (sizeof(uint64_t))));
#define TGT_RING_SIZE (1UL << 16)
-#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)
#endif
-
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