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staging: greybus: add host device function pointer checks 

Add sanity checks for cport_quiesce and cport_clear before invoking the
callbacks as these function pointers are not required during the host
device registration. This follows the logic implemented elsewhere for
various other function pointers.

Signed-off-by: Jason Hrycay <jhrycay@gmail.com>
Reviewed-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason Hrycay 2016-12-20 14:49:27 -06:00 committed by Greg Kroah-Hartman
parent a072a72da9
commit f05a88a39c
1 changed files with 6 additions and 0 deletions
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6
drivers/staging/greybus/connection.c
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@ -357,6 +357,9 @@ static int gb_connection_hd_cport_quiesce(struct gb_connection *connection)
size_t peer_space;
int ret;
if (!hd->driver->cport_quiesce)
return 0;
peer_space = sizeof(struct gb_operation_msg_hdr) +
sizeof(struct gb_cport_shutdown_request);
@ -380,6 +383,9 @@ static int gb_connection_hd_cport_clear(struct gb_connection *connection)
struct gb_host_device *hd = connection->hd;
int ret;
if (!hd->driver->cport_clear)
return 0;
ret = hd->driver->cport_clear(hd, connection->hd_cport_id);
if (ret) {
dev_err(&hd->dev, "%s: failed to clear host cport: %d\n",