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authorAsias He <asias@redhat.com>2013-01-22 11:20:26 +0800
committerNicholas Bellinger <nab@linux-iscsi.org>2013-02-13 11:27:41 -0800
commitf3158f362ca8b77b24c5de86cbec347ab2bb6430 (patch)
tree7475677803571df7f23d3c1efdc309a82311178f /drivers/vhost
parent765b34fdc1507add8fd6f1007410e7a375d0f89c (diff)
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tcm_vhost: Use iov_num_pages to calculate sgl_count
Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/tcm_vhost.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index defc285..62058d7 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -479,11 +479,9 @@ static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
* Find out how long sglist needs to be
*/
sgl_count = 0;
- for (i = 0; i < niov; i++) {
- sgl_count += (((uintptr_t)iov[i].iov_base + iov[i].iov_len +
- PAGE_SIZE - 1) >> PAGE_SHIFT) -
- ((uintptr_t)iov[i].iov_base >> PAGE_SHIFT);
- }
+ for (i = 0; i < niov; i++)
+ sgl_count += iov_num_pages(&iov[i]);
+
/* TODO overflow checking */
sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);