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[SCSI] sg: fix incorrect page problem

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There's a problem where sg is executing a ->nopage operation on a
compound page, it actually calls get_page() on the first page in the
compound rather than the page which is being mapped.  The fix is to
select the correct page by indexing into the compound.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Douglas Gilbert 2006-08-19 00:11:34 -04:00 committed by James Bottomley
parent 48e2691f9c
commit b2155d0417
1 changed files with 4 additions and 4 deletions
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8
drivers/scsi/sg.c
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@ -18,8 +18,8 @@
*
*/
static int sg_version_num = 30533; /* 2 digits for each component */
#define SG_VERSION_STR "3.5.33"
static int sg_version_num = 30534; /* 2 digits for each component */
#define SG_VERSION_STR "3.5.34"
/*
* D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
@ -60,7 +60,7 @@ 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 = "20050908";
static char *sg_version_date = "20060818";
static int sg_proc_init(void);
static void sg_proc_cleanup(void);
@ -1164,7 +1164,7 @@ sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
len = vma->vm_end - sa;
len = (len < sg->length) ? len : sg->length;
if (offset < len) {
page = sg->page;
page = virt_to_page(page_address(sg->page) + offset);
get_page(page); /* increment page count */
break;
}