linux/net/rxrpc
David Howells e122d845a0 Revert "rxrpc: Allow failed client calls to be retried"
The changes introduced to allow rxrpc calls to be retried creates an issue
when it comes to refcounting afs_call structs.  The problem is that when
rxrpc_send_data() queues the last packet for an asynchronous call, the
following sequence can occur:

 (1) The notify_end_tx callback is invoked which causes the state in the
     afs_call to be changed from AFS_CALL_CL_REQUESTING or
     AFS_CALL_SV_REPLYING.

 (2) afs_deliver_to_call() can then process event notifications from rxrpc
     on the async_work queue.

 (3) Delivery of events, such as an abort from the server, can cause the
     afs_call state to be changed to AFS_CALL_COMPLETE on async_work.

 (4) For an asynchronous call, afs_process_async_call() notes that the call
     is complete and tried to clean up all the refs on async_work.

 (5) rxrpc_send_data() might return the amount of data transferred
     (success) or an error - which could in turn reflect a local error or a
     received error.

Synchronising the clean up after rxrpc_kernel_send_data() returns an error
with the asynchronous cleanup is then tricky to get right.

Mostly revert commit c038a58ccf.  The two API
functions the original commit added aren't currently used.  This makes
rxrpc_kernel_send_data() always return successfully if it queued the data
it was given.

Note that this doesn't affect synchronous calls since their Rx notification
function merely pokes a wait queue and does not refcounting.  The
asynchronous call notification function *has* to do refcounting and pass a
ref over the work item to avoid the need to sync the workqueue in call
cleanup.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-01-15 21:33:36 -08:00
..
af_rxrpc.c Revert "rxrpc: Allow failed client calls to be retried" 2019-01-15 21:33:36 -08:00
ar-internal.h Revert "rxrpc: Allow failed client calls to be retried" 2019-01-15 21:33:36 -08:00
call_accept.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-10-19 11:03:06 -07:00
call_event.c rxrpc: Fix lockup due to no error backoff after ack transmit error 2018-11-02 23:59:26 -07:00
call_object.c Revert "rxrpc: Allow failed client calls to be retried" 2019-01-15 21:33:36 -08:00
conn_client.c Revert "rxrpc: Allow failed client calls to be retried" 2019-01-15 21:33:36 -08:00
conn_event.c rxrpc: Fix connection-level abort handling 2018-10-08 22:42:04 +01:00
conn_object.c rxrpc: Drop the local endpoint arg from rxrpc_extract_addr_from_skb() 2018-10-04 09:32:28 +01:00
conn_service.c rxrpc: Fix apparent leak of rxrpc_local objects 2018-03-30 21:05:33 +01:00
input.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-10-12 21:38:46 -07:00
insecure.c rxrpc: Trace protocol errors in received packets 2017-04-06 11:09:39 +01:00
Kconfig rxrpc: Add config to inject packet loss 2016-09-17 11:24:04 +01:00
key.c rxrpc: Use correct timestamp from Kerberos 5 ticket 2017-08-29 10:55:06 +01:00
local_event.c rxrpc: Drop the local endpoint arg from rxrpc_extract_addr_from_skb() 2018-10-04 09:32:28 +01:00
local_object.c rxrpc: Fix incorrect conditional on IPV6 2018-10-15 22:19:46 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
misc.c rxrpc: Fix call timeouts 2017-11-24 10:18:41 +00:00
net_ns.c rxrpc: Add /proc/net/rxrpc/peers to display peer list 2018-10-15 22:52:58 -07:00
output.c rxrpc: Fix lockup due to no error backoff after ack transmit error 2018-11-02 23:59:26 -07:00
peer_event.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-10-19 11:03:06 -07:00
peer_object.c rxrpc: Fix the packet reception routine 2018-10-08 22:42:04 +01:00
proc.c rxrpc: Add /proc/net/rxrpc/peers to display peer list 2018-10-15 22:52:58 -07:00
protocol.h rxrpc: Improve up-front incoming packet checking 2018-09-28 10:32:31 +01:00
recvmsg.c rxrpc: Allow the reply time to be obtained on a client call 2018-10-04 09:42:29 +01:00
rxkad.c rxrpc: Remove VLA usage of skcipher 2018-09-28 12:46:07 +08:00
security.c rxrpc: remove unused static variables 2018-03-30 21:04:44 +01:00
sendmsg.c Revert "rxrpc: Allow failed client calls to be retried" 2019-01-15 21:33:36 -08:00
skbuff.c rxrpc: Use rxrpc_free_skb() rather than rxrpc_lose_skb() 2018-10-04 09:32:27 +01:00
sysctl.c rxrpc: remove redundant static int 'zero' 2018-08-11 11:25:18 -07:00
utils.c rxrpc: Drop the local endpoint arg from rxrpc_extract_addr_from_skb() 2018-10-04 09:32:28 +01:00