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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>
This commit is contained in:
Asias He 2013-01-22 11:20:26 +08:00 committed by Nicholas Bellinger
parent 765b34fdc1
commit f3158f362c
1 changed files with 3 additions and 5 deletions
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8
drivers/vhost/tcm_vhost.c
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@ -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);