Phonet: cleanup pipe enable socket option

The current code works like this:

  int garbage, status;
  socklen_t len = sizeof(status);

  /* enable pipe */
  setsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &garbage, sizeof(garbage));
  /* disable pipe */
  setsockopt(fd, SOL_PNPIPE, PNPIPE_DISABLE, &garbage, sizeof(garbage));
  /* get status */
  getsockopt(fd, SOL_PNPIPE, PNPIPE_INQ, &status, &len);

...which does not follow the usual socket option pattern. This patch
merges all three "options" into a single gettable&settable option,
before Linux 2.6.37 gets out:

  int status;
  socklen_t len = sizeof(status);

  /* enable pipe */
  status = 1;
  setsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &status, sizeof(status));
  /* disable pipe */
  status = 0;
  setsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &status, sizeof(status));
  /* get status */
  getsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &status, &len);

This also fixes the error code from EFAULT to ENOTCONN.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Cc: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 12 deletions

diff --git a/Documentation/networking/phonet.txt b/Documentation/networking/phonet.txt
index cccf5ff07ec2..2d9bc2b711fc 100644
--- a/Documentation/networking/phonet.txt
+++ b/Documentation/networking/phonet.txt
@@ -213,12 +213,9 @@ The implementation adds socket options at SOL_PNPIPE level:
         It then updates the pipe state associated with the sequenced socket to
         be PIPE_DISABLED.
 
-  PNPIPE_ENABLE
-        It follows the same sequence as above for enabling a pipe by sending
-        PNS_PEP_ENABLE_REQ initially and then sending PNS_PEP_ENABLED_IND after
-        getting responses from sequenced socket and remote-pep.
-        It will also update the pipe state associated with the sequenced socket
-        to PIPE_ENABLED.
+  PNPIPE_ENABLE accepts one integer value (int). If set to zero, the pipe
+    is disabled. If the value is non-zero, the pipe is enabled. If the pipe
+    is not (yet) connected, ENOTCONN is error is returned.
 
    PNPIPE_DESTROY
         This will send out PNS_PEP_DISCONNECT_REQ on the sequenced socket and
@@ -226,12 +223,6 @@ The implementation adds socket options at SOL_PNPIPE level:
         It will also update the pipe state associated with the sequenced socket
         to PIPE_IDLE
 
-   PNPIPE_INQ
-        This getsocktopt allows the user-space running on the sequenced socket
-        to examine the pipe state associated with that socket ie. whether the
-        pipe is created (PIPE_DISABLED) or enabled (PIPE_ENABLED) or disabled
-        (PIPE_DISABLED) or no pipe exists (PIPE_IDLE).
-
 After a pipe has been created and enabled successfully, the Pipe data can be
 exchanged between the host-pep and remote-pep (modem).