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IB/uverbs: Fix method merging in uverbs_ioctl_merge

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[ Upstream commit 3d89459e2ef92cc0e5a50dde868780ccda9786c1 ]

Fix a bug in uverbs_ioctl_merge that looked at the object's iterator
number instead of the method's iterator number when merging methods.

While we're at it, make the uverbs_ioctl_merge code a bit more clear
and faster.

Fixes: 118620d3686b ('IB/core: Add uverbs merge trees functionality')
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matan Barak 2018-02-13 12:18:32 +02:00 committed by Greg Kroah-Hartman
parent 44ef222ad0
commit cdd37f48d6
1 changed files with 9 additions and 9 deletions
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18
drivers/infiniband/core/uverbs_ioctl_merge.c
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@ -114,6 +114,7 @@ static size_t get_elements_above_id(const void **iters,
short min = SHRT_MAX;
const void *elem;
int i, j, last_stored = -1;
unsigned int equal_min = 0;
for_each_element(elem, i, j, elements, num_elements, num_offset,
data_offset) {
@ -136,6 +137,10 @@ static size_t get_elements_above_id(const void **iters,
*/
iters[last_stored == i ? num_iters - 1 : num_iters++] = elem;
last_stored = i;
if (min == GET_ID(id))
equal_min++;
else
equal_min = 1;
min = GET_ID(id);
}
@ -146,15 +151,10 @@ static size_t get_elements_above_id(const void **iters,
* Therefore, we need to clean the beginning of the array to make sure
* all ids of final elements are equal to min.
*/
for (i = num_iters - 1; i >= 0 &&
GET_ID(*(u16 *)(iters[i] + id_offset)) == min; i--)
;
num_iters -= i + 1;
memmove(iters, iters + i + 1, sizeof(*iters) * num_iters);
memmove(iters, iters + num_iters - equal_min, sizeof(*iters) * equal_min);
*min_id = min;
return num_iters;
return equal_min;
}
#define find_max_element_entry_id(num_elements, elements, num_objects_fld, \
@ -322,7 +322,7 @@ static struct uverbs_method_spec *build_method_with_attrs(const struct uverbs_me
hash = kzalloc(sizeof(*hash) +
ALIGN(sizeof(*hash->attrs) * (attr_max_bucket + 1),
sizeof(long)) +
BITS_TO_LONGS(attr_max_bucket) * sizeof(long),
BITS_TO_LONGS(attr_max_bucket + 1) * sizeof(long),
GFP_KERNEL);
if (!hash) {
res = -ENOMEM;
@ -509,7 +509,7 @@ static struct uverbs_object_spec *build_object_with_methods(const struct uverbs_
* first handler which != NULL. This also defines the
* set of flags used for this handler.
*/
for (i = num_object_defs - 1;
for (i = num_method_defs - 1;
i >= 0 && !method_defs[i]->handler; i--)
;
hash->methods[min_id++] = method;