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authorMaciej Sosnowski <maciej.sosnowski@intel.com>2008-11-07 01:46:33 +0000
committerDavid S. Miller <davem@davemloft.net>2008-11-10 15:00:56 -0800
commitc2c0b4c5434c0a25f7f7796b29155d53805909f5 (patch)
treeea3fb7e114e06c346d95c94ed288fe8b1a8ac95e
parentc3d4f44f50b65b0b0290e357f8739cfb3f4bcaca (diff)
[2/4] I/OAT: fix dma_pin_iovec_pages() error handling
Error handling needs to be modified in dma_pin_iovec_pages(). It should return NULL instead of ERR_PTR (pinned_list is checked for NULL in tcp_recvmsg() to determine if iovec pages have been successfully pinned down). In case of error for the first iovec, local_list->nr_iovecs needs to be initialized. Cc: <stable@kernel.org> Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/dma/iovlock.c17
1 files changed, 6 insertions, 11 deletions
diff --git a/drivers/dma/iovlock.c b/drivers/dma/iovlock.c
index e763d723e4c..9f6fe46a9b8 100644
--- a/drivers/dma/iovlock.c
+++ b/drivers/dma/iovlock.c
@@ -55,7 +55,6 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
int nr_iovecs = 0;
int iovec_len_used = 0;
int iovec_pages_used = 0;
- long err;
/* don't pin down non-user-based iovecs */
if (segment_eq(get_fs(), KERNEL_DS))
@@ -72,23 +71,21 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
local_list = kmalloc(sizeof(*local_list)
+ (nr_iovecs * sizeof (struct dma_page_list))
+ (iovec_pages_used * sizeof (struct page*)), GFP_KERNEL);
- if (!local_list) {
- err = -ENOMEM;
+ if (!local_list)
goto out;
- }
/* list of pages starts right after the page list array */
pages = (struct page **) &local_list->page_list[nr_iovecs];
+ local_list->nr_iovecs = 0;
+
for (i = 0; i < nr_iovecs; i++) {
struct dma_page_list *page_list = &local_list->page_list[i];
len -= iov[i].iov_len;
- if (!access_ok(VERIFY_WRITE, iov[i].iov_base, iov[i].iov_len)) {
- err = -EFAULT;
+ if (!access_ok(VERIFY_WRITE, iov[i].iov_base, iov[i].iov_len))
goto unpin;
- }
page_list->nr_pages = num_pages_spanned(&iov[i]);
page_list->base_address = iov[i].iov_base;
@@ -109,10 +106,8 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
NULL);
up_read(&current->mm->mmap_sem);
- if (ret != page_list->nr_pages) {
- err = -ENOMEM;
+ if (ret != page_list->nr_pages)
goto unpin;
- }
local_list->nr_iovecs = i + 1;
}
@@ -122,7 +117,7 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
unpin:
dma_unpin_iovec_pages(local_list);
out:
- return ERR_PTR(err);
+ return NULL;
}
void dma_unpin_iovec_pages(struct dma_pinned_list *pinned_list)