diff options
Diffstat (limited to 'net/9p')
| -rw-r--r-- | net/9p/client.c | 18 | ||||
| -rw-r--r-- | net/9p/trans_fd.c | 38 |
2 files changed, 36 insertions, 20 deletions
diff --git a/net/9p/client.c b/net/9p/client.c index 8260f132b32e..34d417670935 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -76,6 +76,20 @@ inline int p9_is_proto_dotu(struct p9_client *clnt) } EXPORT_SYMBOL(p9_is_proto_dotu); +/* + * Some error codes are taken directly from the server replies, + * make sure they are valid. + */ +static int safe_errno(int err) +{ + if ((err > 0) || (err < -MAX_ERRNO)) { + p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); + return -EPROTO; + } + return err; +} + + /* Interpret mount option for protocol version */ static int get_protocol_version(char *s) { @@ -782,7 +796,7 @@ again: return req; reterr: p9_free_req(c, req); - return ERR_PTR(err); + return ERR_PTR(safe_errno(err)); } /** @@ -865,7 +879,7 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, return req; reterr: p9_free_req(c, req); - return ERR_PTR(err); + return ERR_PTR(safe_errno(err)); } static struct p9_fid *p9_fid_create(struct p9_client *clnt) diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c index 15656b8573f3..02efb25c2957 100644 --- a/net/9p/trans_fd.c +++ b/net/9p/trans_fd.c @@ -316,8 +316,7 @@ static void p9_read_work(struct work_struct *work) m->rsize - m->rpos); p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); if (err == -EAGAIN) { - clear_bit(Rworksched, &m->wsched); - return; + goto end_clear; } if (err <= 0) @@ -379,19 +378,20 @@ static void p9_read_work(struct work_struct *work) m->req = NULL; } +end_clear: + clear_bit(Rworksched, &m->wsched); + if (!list_empty(&m->req_list)) { if (test_and_clear_bit(Rpending, &m->wsched)) n = POLLIN; else n = p9_fd_poll(m->client, NULL); - if (n & POLLIN) { + if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); schedule_work(&m->rq); - } else - clear_bit(Rworksched, &m->wsched); - } else - clear_bit(Rworksched, &m->wsched); + } + } return; error: @@ -453,12 +453,13 @@ static void p9_write_work(struct work_struct *work) } if (!m->wsize) { + spin_lock(&m->client->lock); if (list_empty(&m->unsent_req_list)) { clear_bit(Wworksched, &m->wsched); + spin_unlock(&m->client->lock); return; } - spin_lock(&m->client->lock); req = list_entry(m->unsent_req_list.next, struct p9_req_t, req_list); req->status = REQ_STATUS_SENT; @@ -476,10 +477,9 @@ static void p9_write_work(struct work_struct *work) clear_bit(Wpending, &m->wsched); err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); - if (err == -EAGAIN) { - clear_bit(Wworksched, &m->wsched); - return; - } + if (err == -EAGAIN) + goto end_clear; + if (err < 0) goto error; @@ -492,19 +492,21 @@ static void p9_write_work(struct work_struct *work) if (m->wpos == m->wsize) m->wpos = m->wsize = 0; - if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { +end_clear: + clear_bit(Wworksched, &m->wsched); + + if (m->wsize || !list_empty(&m->unsent_req_list)) { if (test_and_clear_bit(Wpending, &m->wsched)) n = POLLOUT; else n = p9_fd_poll(m->client, NULL); - if (n & POLLOUT) { + if ((n & POLLOUT) && + !test_and_set_bit(Wworksched, &m->wsched)) { p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); schedule_work(&m->wq); - } else - clear_bit(Wworksched, &m->wsched); - } else - clear_bit(Wworksched, &m->wsched); + } + } return; |