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RDMA/rxe: Convert read side locking to rcu

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Use rcu_read_lock() for protecting read side operations in rxe_pool.c.

Link: https://lore.kernel.org/r/20220612223434.31462-3-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Bob Pearson 2022-06-12 17:34:35 -05:00 • committed by Jason Gunthorpe
parent 215d0a755e
commit b54c2a25ac
1 changed files with 7 additions and 15 deletions
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22
drivers/infiniband/sw/rxe/rxe_pool.c
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@ -197,16 +197,15 @@ void *rxe_pool_get_index(struct rxe_pool *pool, u32 index)
{
struct rxe_pool_elem *elem;
struct xarray *xa = &pool->xa;
unsigned long flags;
void *obj;
xa_lock_irqsave(xa, flags);
rcu_read_lock();
elem = xa_load(xa, index);
if (elem && kref_get_unless_zero(&elem->ref_cnt))
obj = elem->obj;
else
obj = NULL;
xa_unlock_irqrestore(xa, flags);
rcu_read_unlock();
return obj;
}
@ -223,7 +222,6 @@ int __rxe_cleanup(struct rxe_pool_elem *elem, bool sleepable)
struct rxe_pool *pool = elem->pool;
struct xarray *xa = &pool->xa;
static int timeout = RXE_POOL_TIMEOUT;
unsigned long flags;
int ret, err = 0;
void *xa_ret;
@ -233,9 +231,7 @@ int __rxe_cleanup(struct rxe_pool_elem *elem, bool sleepable)
/* erase xarray entry to prevent looking up
* the pool elem from its index
*/
xa_lock_irqsave(xa, flags);
xa_ret = __xa_erase(xa, elem->index);
xa_unlock_irqrestore(xa, flags);
xa_ret = xa_erase(xa, elem->index);
WARN_ON(xa_err(xa_ret));
/* if this is the last call to rxe_put complete the
@ -280,7 +276,7 @@ int __rxe_cleanup(struct rxe_pool_elem *elem, bool sleepable)
pool->cleanup(elem);
if (pool->type == RXE_TYPE_MR)
kfree(elem->obj);
kfree_rcu(elem->obj);
atomic_dec(&pool->num_elem);
@ -299,12 +295,8 @@ int __rxe_put(struct rxe_pool_elem *elem)
void __rxe_finalize(struct rxe_pool_elem *elem)
{
struct xarray *xa = &elem->pool->xa;
unsigned long flags;
void *ret;
void *xa_ret;
xa_lock_irqsave(xa, flags);
ret = __xa_store(&elem->pool->xa, elem->index, elem, GFP_KERNEL);
xa_unlock_irqrestore(xa, flags);
WARN_ON(xa_err(ret));
xa_ret = xa_store(&elem->pool->xa, elem->index, elem, GFP_KERNEL);
WARN_ON(xa_err(xa_ret));
}