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Staging: hv: storvsc: Fix a bug in create_bounce_buffer() 

Set the length field of the scatter gather elements correctly when we create
the bounce buffer. When we use the bounce buffer for a "write" operation,
the act of copying to the bounce buffer, correctly deals with this issue.
However, on the "read" side, the current code was not correctly setting
the buffer length. Fix this bug. Note that when we copy from the bounce
buffer (for the read case), the amount we copy is controlled by the original
scatter gather list given to the driver.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reported-by: Dadok Milan <dadok@kvados.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-12-07 07:15:52 -08:00 committed by Greg Kroah-Hartman
parent 4219001fc9
commit 6e8087a4fa
1 changed files with 6 additions and 3 deletions
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9
drivers/staging/hv/storvsc_drv.c
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@ -893,12 +893,14 @@ static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
unsigned int sg_count,
unsigned int len)
unsigned int len,
int write)
{
int i;
int num_pages;
struct scatterlist *bounce_sgl;
struct page *page_buf;
unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
@ -910,7 +912,7 @@ static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
page_buf = alloc_page(GFP_ATOMIC);
if (!page_buf)
goto cleanup;
sg_set_page(&bounce_sgl[i], page_buf, 0, 0);
sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
}
return bounce_sgl;
@ -1348,7 +1350,8 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
cmd_request->bounce_sgl =
create_bounce_buffer(sgl, scsi_sg_count(scmnd),
scsi_bufflen(scmnd));
scsi_bufflen(scmnd),
vm_srb->data_in);
if (!cmd_request->bounce_sgl) {
scmnd->host_scribble = NULL;
mempool_free(cmd_request,