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usb: gadget: f_midi: use flexible array member for gmidi_in_port elements

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Reduce number of allocations, simplify memory management and reduce
memory usage by stacking the gmidi_in_port elements at the end of the
f_midi structure using a flexible array.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Michal Nazarewicz 2016-01-05 14:43:42 +01:00 committed by Felipe Balbi
parent 06cd928b0c
commit bf0028f8cb
1 changed files with 18 additions and 37 deletions
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55
drivers/usb/gadget/function/f_midi.c
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@ -79,7 +79,6 @@ struct f_midi {
struct snd_rawmidi_substream *in_substream[MAX_PORTS];
struct snd_rawmidi_substream *out_substream[MAX_PORTS];
struct gmidi_in_port *in_port[MAX_PORTS];
unsigned long out_triggered;
struct tasklet_struct tasklet;
@ -91,6 +90,8 @@ struct f_midi {
/* This fifo is used as a buffer ring for pre-allocated IN usb_requests */
DECLARE_KFIFO_PTR(in_req_fifo, struct usb_request *);
unsigned int in_last_port;
struct gmidi_in_port in_ports_array[/* in_ports */];
};
static inline struct f_midi *func_to_midi(struct usb_function *f)
@ -517,24 +518,17 @@ static void f_midi_drop_out_substreams(struct f_midi *midi)
{
unsigned int i;
for (i = 0; i < MAX_PORTS; i++) {
struct gmidi_in_port *port = midi->in_port[i];
for (i = 0; i < midi->in_ports; i++) {
struct gmidi_in_port *port = midi->in_ports_array + i;
struct snd_rawmidi_substream *substream = midi->in_substream[i];
if (!port)
break;
if (!port->active || !substream)
continue;
snd_rawmidi_drop_output(substream);
if (port->active && substream)
snd_rawmidi_drop_output(substream);
}
}
static int f_midi_do_transmit(struct f_midi *midi, struct usb_ep *ep)
{
struct usb_request *req = NULL;
struct gmidi_in_port *port;
unsigned int len, i;
bool active = false;
int err;
@ -558,9 +552,10 @@ static int f_midi_do_transmit(struct f_midi *midi, struct usb_ep *ep)
if (req->length > 0)
return 0;
i = midi->in_last_port;
for (; i < MAX_PORTS && (port = midi->in_port[i]); ++i) {
for (i = midi->in_last_port; i < midi->in_ports; ++i) {
struct gmidi_in_port *port = midi->in_ports_array + i;
struct snd_rawmidi_substream *substream = midi->in_substream[i];
if (!port->active || !substream)
continue;
@ -629,12 +624,12 @@ static int f_midi_in_open(struct snd_rawmidi_substream *substream)
{
struct f_midi *midi = substream->rmidi->private_data;
if (!midi->in_port[substream->number])
if (substream->number >= midi->in_ports)
return -EINVAL;
VDBG(midi, "%s()\n", __func__);
midi->in_substream[substream->number] = substream;
midi->in_port[substream->number]->state = STATE_UNKNOWN;
midi->in_ports_array[substream->number].state = STATE_UNKNOWN;
return 0;
}
@ -650,11 +645,11 @@ static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up)
{
struct f_midi *midi = substream->rmidi->private_data;
if (!midi->in_port[substream->number])
if (substream->number >= midi->in_ports)
return;
VDBG(midi, "%s() %d\n", __func__, up);
midi->in_port[substream->number]->active = up;
midi->in_ports_array[substream->number].active = up;
if (up)
tasklet_hi_schedule(&midi->tasklet);
}
@ -1130,14 +1125,11 @@ static void f_midi_free(struct usb_function *f)
{
struct f_midi *midi;
struct f_midi_opts *opts;
int i;
midi = func_to_midi(f);
opts = container_of(f->fi, struct f_midi_opts, func_inst);
kfree(midi->id);
mutex_lock(&opts->lock);
for (i = opts->in_ports - 1; i >= 0; --i)
kfree(midi->in_port[i]);
kfifo_free(&midi->in_req_fifo);
kfree(midi);
--opts->refcnt;
@ -1179,25 +1171,16 @@ static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
}
/* allocate and initialize one new instance */
midi = kzalloc(sizeof(*midi), GFP_KERNEL);
midi = kzalloc(
sizeof(*midi) + opts->in_ports * sizeof(*midi->in_ports_array),
GFP_KERNEL);
if (!midi) {
mutex_unlock(&opts->lock);
return ERR_PTR(-ENOMEM);
}
for (i = 0; i < opts->in_ports; i++) {
struct gmidi_in_port *port = kzalloc(sizeof(*port), GFP_KERNEL);
if (!port) {
status = -ENOMEM;
mutex_unlock(&opts->lock);
goto setup_fail;
}
port->active = 0;
port->cable = i;
midi->in_port[i] = port;
}
for (i = 0; i < opts->in_ports; i++)
midi->in_ports_array[i].cable = i;
/* set up ALSA midi devices */
midi->id = kstrdup(opts->id, GFP_KERNEL);
@ -1230,8 +1213,6 @@ static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
return &midi->func;
setup_fail:
for (--i; i >= 0; i--)
kfree(midi->in_port[i]);
kfree(midi);
return ERR_PTR(status);
}