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authorDouglas Gilbert <dougg@torque.net>2005-09-01 21:50:02 +1000
committerJames Bottomley <jejb@mulgrave.(none)>2005-09-04 19:46:03 -0500
commitdeb92b7ee98e8e580cafaa63bd1edbe6646877bc (patch)
treed9f5210e78095048a2ba8a0cd90b19116d1a894f /drivers/scsi/sg.c
parent07542b832309b93a2741cd162a391ab909f66438 (diff)
[SCSI] sg direct io/mmap oops, st sync
This patch adopts the same solution as proposed by Kai M. in a post titled: "[PATCH] SCSI tape signed/unsigned fix". The fix is in a function that the sg driver borrowed from the st driver so its maintenance is a little easier if the functions remain the same after the fix. - change nr_pages type from unsigned to signed so errors from get_user_pages() call are properly handled Signed-off-by: Douglas Gilbert <dougg@torque.net> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/sg.c')
-rw-r--r--drivers/scsi/sg.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 14fb179b384..616c3f3e62f 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -61,7 +61,7 @@ static int sg_version_num = 30533; /* 2 digits for each component */
#ifdef CONFIG_SCSI_PROC_FS
#include <linux/proc_fs.h>
-static char *sg_version_date = "20050328";
+static char *sg_version_date = "20050901";
static int sg_proc_init(void);
static void sg_proc_cleanup(void);
@@ -1794,12 +1794,12 @@ st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
unsigned long uaddr, size_t count, int rw,
unsigned long max_pfn)
{
+ unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ unsigned long start = uaddr >> PAGE_SHIFT;
+ const int nr_pages = end - start;
int res, i, j;
- unsigned int nr_pages;
struct page **pages;
- nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT;
-
/* User attempted Overflow! */
if ((uaddr + count) < uaddr)
return -EINVAL;