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staging: kpc2000: kpc_dma: Unpin partial pinned pages 

There is a bug, when get_user_pages() failed but partially pinned
pages are not unpinned and positive numbers are returned instead of
-ERRNO. Fixed it.

Also, int is more appropriate type for rv. Changed it.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Bharath Vedartham <linux.bhar@gmail.com>
Link: https://lore.kernel.org/r/1593584264-16982-2-git-send-email-jrdr.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Souptick Joarder 2020-07-01 11:47:41 +05:30 committed by Greg Kroah-Hartman
parent f9b468a3bd
commit 63ed1e0287
1 changed files with 9 additions and 4 deletions
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13
drivers/staging/kpc2000/kpc_dma/fileops.c
View File

@ -35,7 +35,7 @@ static int kpc_dma_transfer(struct dev_private_data *priv,
unsigned long iov_base, size_t iov_len)
{
unsigned int i = 0;
long rv = 0;
int rv = 0;
struct kpc_dma_device *ldev;
struct aio_cb_data *acd;
DECLARE_COMPLETION_ONSTACK(done);
@ -79,14 +79,14 @@ static int kpc_dma_transfer(struct dev_private_data *priv,
rv = get_user_pages(iov_base, acd->page_count, FOLL_TOUCH | FOLL_WRITE | FOLL_GET, acd->user_pages, NULL);
mmap_read_unlock(current->mm); /* release the semaphore */
if (rv != acd->page_count) {
dev_err(&priv->ldev->pldev->dev, "Couldn't get_user_pages (%ld)\n", rv);
dev_err(&priv->ldev->pldev->dev, "Couldn't get_user_pages (%d)\n", rv);
goto err_get_user_pages;
}
// Allocate and setup the sg_table (scatterlist entries)
rv = sg_alloc_table_from_pages(&acd->sgt, acd->user_pages, acd->page_count, iov_base & (PAGE_SIZE - 1), iov_len, GFP_KERNEL);
if (rv) {
dev_err(&priv->ldev->pldev->dev, "Couldn't alloc sg_table (%ld)\n", rv);
dev_err(&priv->ldev->pldev->dev, "Couldn't alloc sg_table (%d)\n", rv);
goto err_alloc_sg_table;
}
@ -193,10 +193,15 @@ static int kpc_dma_transfer(struct dev_private_data *priv,
put_page(acd->user_pages[i]);
err_get_user_pages:
if (rv > 0) {
for (i = 0; i < rv; i++)
put_pages(acd->user_pages[i]);
rv = -EFAULT;
}
kfree(acd->user_pages);
err_alloc_userpages:
kfree(acd);
dev_dbg(&priv->ldev->pldev->dev, "%s returning with error %ld\n", __func__, rv);
dev_dbg(&priv->ldev->pldev->dev, "%s returning with error %d\n", __func__, rv);
return rv;
}