From: Dan Carpenter <dan.carpenter@xxxxxxxxxx> This patch separates success & failure block along with fixing following issues:- 1. The way oz_hcd_pd_arrived() looks now it's easy to think we free "ep" but actually we do this spaghetti thing of setting it to NULL on success. 2. It is hard to read it because there are unlocks scattered throughout. 3. Currently we set "ep" to NULL on the success path and then test it and or free it. In current code you have to scroll to the start of the function to read code. Original patch was submitted by Dan here :- http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2013-August/040113.html Signed-off-by: Rupesh Gujare <rupesh.gujare@xxxxxxxxx> --- drivers/staging/ozwpan/ozhcd.c | 54 ++++++++++++++++++++-------------------- 1 file changed, 27 insertions(+), 27 deletions(-) diff --git a/drivers/staging/ozwpan/ozhcd.c b/drivers/staging/ozwpan/ozhcd.c index 0b21c9f..4cd08da 100644 --- a/drivers/staging/ozwpan/ozhcd.c +++ b/drivers/staging/ozwpan/ozhcd.c @@ -668,50 +668,50 @@ struct oz_port *oz_hcd_pd_arrived(void *hpd) struct oz_endpoint *ep; ozhcd = oz_hcd_claim(); - if (ozhcd == NULL) + if (!ozhcd) return NULL; /* Allocate an endpoint object in advance (before holding hcd lock) to * use for out endpoint 0. */ ep = oz_ep_alloc(0, GFP_ATOMIC); + if (!ep) + goto err_put; + spin_lock_bh(&ozhcd->hcd_lock); - if (ozhcd->conn_port >= 0) { - spin_unlock_bh(&ozhcd->hcd_lock); - oz_dbg(ON, "conn_port >= 0\n"); - goto out; - } + if (ozhcd->conn_port >= 0) + goto err_unlock; + for (i = 0; i < OZ_NB_PORTS; i++) { struct oz_port *port = &ozhcd->ports[i]; + spin_lock(&port->port_lock); - if ((port->flags & OZ_PORT_F_PRESENT) == 0) { + if (!(port->flags & OZ_PORT_F_PRESENT)) { oz_acquire_port(port, hpd); spin_unlock(&port->port_lock); break; } spin_unlock(&port->port_lock); } - if (i < OZ_NB_PORTS) { - oz_dbg(ON, "Setting conn_port = %d\n", i); - ozhcd->conn_port = i; - /* Attach out endpoint 0. - */ - ozhcd->ports[i].out_ep[0] = ep; - ep = NULL; - hport = &ozhcd->ports[i]; - spin_unlock_bh(&ozhcd->hcd_lock); - if (ozhcd->flags & OZ_HDC_F_SUSPENDED) { - oz_dbg(ON, "Resuming root hub\n"); - usb_hcd_resume_root_hub(ozhcd->hcd); - } - usb_hcd_poll_rh_status(ozhcd->hcd); - } else { - spin_unlock_bh(&ozhcd->hcd_lock); - } -out: - if (ep) /* ep is non-null if not used. */ - oz_ep_free(NULL, ep); + if (i == OZ_NB_PORTS) + goto err_unlock; + + ozhcd->conn_port = i; + hport = &ozhcd->ports[i]; + hport->out_ep[0] = ep; + spin_unlock_bh(&ozhcd->hcd_lock); + if (ozhcd->flags & OZ_HDC_F_SUSPENDED) + usb_hcd_resume_root_hub(ozhcd->hcd); + usb_hcd_poll_rh_status(ozhcd->hcd); oz_hcd_put(ozhcd); + return hport; + +err_unlock: + spin_unlock_bh(&ozhcd->hcd_lock); + oz_ep_free(NULL, ep); +err_put: + oz_hcd_put(ozhcd); + return NULL; } /*------------------------------------------------------------------------------ -- 1.7.9.5 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
