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Message-ID: <20080827220508.GQ11734@cs181140183.pp.htv.fi>
Date: Thu, 28 Aug 2008 01:05:08 +0300
From: Adrian Bunk <bunk@...nel.org>
To: dcbw@...hat.com, linville@...driver.com
Cc: linux-wireless@...r.kernel.org, libertas-dev@...ts.infradead.org,
netdev@...r.kernel.org
Subject: [RFC: 2.6 patch] wireless/libertas/if_cs.c: fix memory leaks
The leak in if_cs_prog_helper() is obvious.
It looks a bit as if not freeing "fw" in if_cs_prog_real() was done
intentionally, but I'm not seeing why it shouldn't be freed.
Reported-by: Adrian Bunk <bunk@...nel.org>
Signed-off-by: Adrian Bunk <bunk@...nel.org>
---
drivers/net/wireless/libertas/if_cs.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)
0a425d93156677eb4825fc185bfe1affe5a7db2b
diff --git a/drivers/net/wireless/libertas/if_cs.c b/drivers/net/wireless/libertas/if_cs.c
index 04d7a25..8941919 100644
--- a/drivers/net/wireless/libertas/if_cs.c
+++ b/drivers/net/wireless/libertas/if_cs.c
@@ -529,227 +529,220 @@ static irqreturn_t if_cs_interrupt(int irq, void *data)
static int if_cs_prog_helper(struct if_cs_card *card)
{
int ret = 0;
int sent = 0;
u8 scratch;
const struct firmware *fw;
lbs_deb_enter(LBS_DEB_CS);
scratch = if_cs_read8(card, IF_CS_SCRATCH);
/* "If the value is 0x5a, the firmware is already
* downloaded successfully"
*/
if (scratch == IF_CS_SCRATCH_HELPER_OK)
goto done;
/* "If the value is != 00, it is invalid value of register */
if (scratch != IF_CS_SCRATCH_BOOT_OK) {
ret = -ENODEV;
goto done;
}
/* TODO: make firmware file configurable */
ret = request_firmware(&fw, "libertas_cs_helper.fw",
&handle_to_dev(card->p_dev));
if (ret) {
lbs_pr_err("can't load helper firmware\n");
ret = -ENODEV;
goto done;
}
lbs_deb_cs("helper size %td\n", fw->size);
/* "Set the 5 bytes of the helper image to 0" */
/* Not needed, this contains an ARM branch instruction */
for (;;) {
/* "the number of bytes to send is 256" */
int count = 256;
int remain = fw->size - sent;
if (remain < count)
count = remain;
/* "write the number of bytes to be sent to the I/O Command
* write length register" */
if_cs_write16(card, IF_CS_CMD_LEN, count);
/* "write this to I/O Command port register as 16 bit writes */
if (count)
if_cs_write16_rep(card, IF_CS_CMD,
&fw->data[sent],
count >> 1);
/* "Assert the download over interrupt command in the Host
* status register" */
if_cs_write8(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);
/* "Assert the download over interrupt command in the Card
* interrupt case register" */
if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);
/* "The host polls the Card Status register ... for 50 ms before
declaring a failure */
ret = if_cs_poll_while_fw_download(card, IF_CS_CARD_STATUS,
IF_CS_BIT_COMMAND);
if (ret < 0) {
lbs_pr_err("can't download helper at 0x%x, ret %d\n",
sent, ret);
- goto done;
+ goto err_release;
}
if (count == 0)
break;
sent += count;
}
+err_release:
release_firmware(fw);
- ret = 0;
-
done:
lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
return ret;
}
static int if_cs_prog_real(struct if_cs_card *card)
{
const struct firmware *fw;
int ret = 0;
int retry = 0;
int len = 0;
int sent;
lbs_deb_enter(LBS_DEB_CS);
/* TODO: make firmware file configurable */
ret = request_firmware(&fw, "libertas_cs.fw",
&handle_to_dev(card->p_dev));
if (ret) {
lbs_pr_err("can't load firmware\n");
ret = -ENODEV;
goto done;
}
lbs_deb_cs("fw size %td\n", fw->size);
ret = if_cs_poll_while_fw_download(card, IF_CS_SQ_READ_LOW,
IF_CS_SQ_HELPER_OK);
if (ret < 0) {
lbs_pr_err("helper firmware doesn't answer\n");
goto err_release;
}
for (sent = 0; sent < fw->size; sent += len) {
len = if_cs_read16(card, IF_CS_SQ_READ_LOW);
if (len & 1) {
retry++;
lbs_pr_info("odd, need to retry this firmware block\n");
} else {
retry = 0;
}
if (retry > 20) {
lbs_pr_err("could not download firmware\n");
ret = -ENODEV;
goto err_release;
}
if (retry) {
sent -= len;
}
if_cs_write16(card, IF_CS_CMD_LEN, len);
if_cs_write16_rep(card, IF_CS_CMD,
&fw->data[sent],
(len+1) >> 1);
if_cs_write8(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);
if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);
ret = if_cs_poll_while_fw_download(card, IF_CS_CARD_STATUS,
IF_CS_BIT_COMMAND);
if (ret < 0) {
lbs_pr_err("can't download firmware at 0x%x\n", sent);
goto err_release;
}
}
ret = if_cs_poll_while_fw_download(card, IF_CS_SCRATCH, 0x5a);
- if (ret < 0) {
+ if (ret < 0)
lbs_pr_err("firmware download failed\n");
- goto err_release;
- }
-
- ret = 0;
- goto done;
-
err_release:
release_firmware(fw);
done:
lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
return ret;
}
/********************************************************************/
/* Callback functions for libertas.ko */
/********************************************************************/
/* Send commands or data packets to the card */
static int if_cs_host_to_card(struct lbs_private *priv,
u8 type,
u8 *buf,
u16 nb)
{
int ret = -1;
lbs_deb_enter_args(LBS_DEB_CS, "type %d, bytes %d", type, nb);
switch (type) {
case MVMS_DAT:
priv->dnld_sent = DNLD_DATA_SENT;
if_cs_send_data(priv, buf, nb);
ret = 0;
break;
case MVMS_CMD:
priv->dnld_sent = DNLD_CMD_SENT;
ret = if_cs_send_cmd(priv, buf, nb);
break;
default:
lbs_pr_err("%s: unsupported type %d\n", __FUNCTION__, type);
}
lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
return ret;
}
/********************************************************************/
/* Card Services */
/********************************************************************/
/*
* After a card is removed, if_cs_release() will unregister the
* device, and release the PCMCIA configuration. If the device is
* still open, this will be postponed until it is closed.
*/
static void if_cs_release(struct pcmcia_device *p_dev)
{
struct if_cs_card *card = p_dev->priv;
lbs_deb_enter(LBS_DEB_CS);
free_irq(p_dev->irq.AssignedIRQ, card);
pcmcia_disable_device(p_dev);
if (card->iobase)
ioport_unmap(card->iobase);
lbs_deb_leave(LBS_DEB_CS);
}
/*
--
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