net/smc: use mutex instead of rwlock_t to protect buffers
The locks for sndbufs and rmbs are never used from atomic context. Using a mutex for these locks will allow to nest locks with other mutexes. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -385,8 +385,8 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
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lgr->freefast = 0;
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lgr->freeing = 0;
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lgr->vlan_id = ini->vlan_id;
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rwlock_init(&lgr->sndbufs_lock);
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rwlock_init(&lgr->rmbs_lock);
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mutex_init(&lgr->sndbufs_lock);
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mutex_init(&lgr->rmbs_lock);
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rwlock_init(&lgr->conns_lock);
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for (i = 0; i < SMC_RMBE_SIZES; i++) {
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INIT_LIST_HEAD(&lgr->sndbufs[i]);
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@ -456,9 +456,9 @@ static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
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}
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if (rmb_desc->is_reg_err) {
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/* buf registration failed, reuse not possible */
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write_lock_bh(&lgr->rmbs_lock);
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mutex_lock(&lgr->rmbs_lock);
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list_del(&rmb_desc->list);
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write_unlock_bh(&lgr->rmbs_lock);
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mutex_unlock(&lgr->rmbs_lock);
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smc_buf_free(lgr, true, rmb_desc);
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} else {
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@ -1059,19 +1059,19 @@ int smc_uncompress_bufsize(u8 compressed)
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* buffer size; if not available, return NULL
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*/
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static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
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rwlock_t *lock,
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struct mutex *lock,
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struct list_head *buf_list)
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{
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struct smc_buf_desc *buf_slot;
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read_lock_bh(lock);
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mutex_lock(lock);
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list_for_each_entry(buf_slot, buf_list, list) {
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if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
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read_unlock_bh(lock);
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mutex_unlock(lock);
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return buf_slot;
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}
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}
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read_unlock_bh(lock);
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mutex_unlock(lock);
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return NULL;
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}
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@ -1220,8 +1220,8 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
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struct smc_link_group *lgr = conn->lgr;
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struct list_head *buf_list;
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int bufsize, bufsize_short;
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struct mutex *lock; /* lock buffer list */
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int sk_buf_size;
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rwlock_t *lock;
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if (is_rmb)
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/* use socket recv buffer size (w/o overhead) as start value */
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@ -1262,9 +1262,9 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
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continue;
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buf_desc->used = 1;
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write_lock_bh(lock);
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mutex_lock(lock);
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list_add(&buf_desc->list, buf_list);
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write_unlock_bh(lock);
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mutex_unlock(lock);
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break; /* found */
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}
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@ -205,9 +205,9 @@ struct smc_link_group {
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unsigned short vlan_id; /* vlan id of link group */
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struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */
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rwlock_t sndbufs_lock; /* protects tx buffers */
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struct mutex sndbufs_lock; /* protects tx buffers */
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struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */
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rwlock_t rmbs_lock; /* protects rx buffers */
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struct mutex rmbs_lock; /* protects rx buffers */
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u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */
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struct delayed_work free_work; /* delayed freeing of an lgr */
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