diff options
| author | Tomer Tayar <Tomer.Tayar@qlogic.com> | 2015-12-07 14:25:56 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-12-07 22:14:03 +0300 |
| commit | 4639d60d2bfb7f5007b5d93788fd93c19b63f000 (patch) | |
| tree | 700ce3b8225ff3fb235750875b8739956814a1c7 /include | |
| parent | 4675390a9e7183bf45590e84a183e22e32c485a7 (diff) | |
| download | linux-4639d60d2bfb7f5007b5d93788fd93c19b63f000.tar.xz | |
qed: Fix corner case for chain in-between pages
The amount of chain next pointer elements between the producer
and the consumer indices depends on which pages they currently
point to. The current calculation is based only on their difference,
and it can lead to a number of free elements which is higher by 1
than the actual value.
Signed-off-by: Tomer Tayar <Tomer.Tayar@qlogic.com>
Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/qed/qed_chain.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/qed/qed_chain.h b/include/linux/qed/qed_chain.h index b920c3605c46..41b9049b57e2 100644 --- a/include/linux/qed/qed_chain.h +++ b/include/linux/qed/qed_chain.h @@ -111,7 +111,8 @@ static inline u16 qed_chain_get_elem_left(struct qed_chain *p_chain) used = ((u32)0x10000u + (u32)(p_chain->prod_idx)) - (u32)p_chain->cons_idx; if (p_chain->mode == QED_CHAIN_MODE_NEXT_PTR) - used -= (used / p_chain->elem_per_page); + used -= p_chain->prod_idx / p_chain->elem_per_page - + p_chain->cons_idx / p_chain->elem_per_page; return p_chain->capacity - used; } |