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Date: Thu, 26 Jan 2017 22:50:05 +0100
From: "Luis R. Rodriguez" <mcgrof@...nel.org>
To: "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc: Greg KH <gregkh@...uxfoundation.org>, ming.lei@...onical.com,
bp@...en8.de, wagi@...om.org, teg@...m.no, mchehab@....samsung.com,
zajec5@...il.com, linux-kernel@...r.kernel.org,
markivx@...eaurora.org, stephen.boyd@...aro.org,
broonie@...nel.org, zohar@...ux.vnet.ibm.com, tiwai@...e.de,
johannes@...solutions.net, chunkeey@...glemail.com,
hauke@...ke-m.de, jwboyer@...oraproject.org,
dmitry.torokhov@...il.com, dwmw2@...radead.org, jslaby@...e.com,
torvalds@...ux-foundation.org, luto@...capital.net,
fengguang.wu@...el.com, rpurdie@...ys.net,
j.anaszewski@...sung.com, Abhay_Salunke@...l.com,
Julia.Lawall@...6.fr, Gilles.Muller@...6.fr, nicolas.palix@...g.fr,
dhowells@...hat.com, bjorn.andersson@...aro.org,
arend.vanspriel@...adcom.com, kvalo@...eaurora.org
Subject: Re: [PATCH v4 3/3] p54: convert to sysdata API
On Thu, Jan 19, 2017 at 05:27:51PM +0100, Luis R. Rodriguez wrote:
> On Thu, Jan 19, 2017 at 12:38:57PM +0100, Greg KH wrote:
> > On Thu, Jan 12, 2017 at 07:02:44AM -0800, Luis R. Rodriguez wrote:
> > > ---
> > > drivers/net/wireless/intersil/p54/eeprom.c | 2 +-
> > > drivers/net/wireless/intersil/p54/fwio.c | 5 +-
> > > drivers/net/wireless/intersil/p54/led.c | 2 +-
> > > drivers/net/wireless/intersil/p54/main.c | 2 +-
> > > drivers/net/wireless/intersil/p54/p54.h | 3 +-
> > > drivers/net/wireless/intersil/p54/p54pci.c | 26 ++++++----
> > > drivers/net/wireless/intersil/p54/p54pci.h | 4 +-
> > > drivers/net/wireless/intersil/p54/p54spi.c | 80 +++++++++++++++++++-----------
> > > drivers/net/wireless/intersil/p54/p54spi.h | 2 +-
> > > drivers/net/wireless/intersil/p54/p54usb.c | 18 +++----
> > > drivers/net/wireless/intersil/p54/p54usb.h | 4 +-
> > > drivers/net/wireless/intersil/p54/txrx.c | 2 +-
> > > 12 files changed, 89 insertions(+), 61 deletions(-)
> >
> > why does the "new" api require more lines?
>
> This is a bare bones flexible API with only a few new tiny features to start
> with, one of them was to enable the API do the freeing of the driver data for
> you. In the kernel we have devres to help with this but devres only helps if
> you would use the API call on probe. We want to support the ability to let the
> API free the driver data for you even if your call is outside of probe, for this
> to work we need a callback. For async calls this is rather trivial given we
> already have a callback, for sync calls this means a new routine is needed.
> Freeing the data for you is an option, but I decided to keep the callback
> requirement even if you didn't want the free'ing to be done for you. The
> addition of a callback is what accounts for the slight increase on this driver.
>
> I could try avoiding the callback if no freeing is needed.
OK I've added a respective helper call which would map 1-1 with the
old sync mechanism to enable a 1-1 change, this will be called
driver_data_request_simple(), but let me know if there is a preference
for something else.
With this the only visible delta now is from taking advantage of new
features. In p54's case this would re-organize the mess in
drivers/net/wireless/intersil/p54/p54spi.c, the diff stat is a bit
larger for that file just because of this but I think in this case
its very much worth the small additions. In this case two routines are
added for handling the work through callbacks on a sync call.
1 file changed, 38 insertions(+), 30 deletions(-)
diff --git a/drivers/net/wireless/intersil/p54/p54spi.c b/drivers/net/wireless/intersil/p54/p54spi.c
index 7ab2f43ab425..6183a8bfa149 100644
--- a/drivers/net/wireless/intersil/p54/p54spi.c
+++ b/drivers/net/wireless/intersil/p54/p54spi.c
@@ -23,7 +23,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
-#include <linux/firmware.h>
+#include <linux/driver_data.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/spi/spi.h>
@@ -168,47 +168,55 @@ static int p54spi_request_firmware(struct ieee80211_hw *dev)
int ret;
/* FIXME: should driver use it's own struct device? */
- ret = request_firmware(&priv->firmware, "3826.arm", &priv->spi->dev);
-
- if (ret < 0) {
- dev_err(&priv->spi->dev, "request_firmware() failed: %d", ret);
+ ret = driver_data_request_simple("3826.arm", &priv->spi->dev,
+ &priv->firmware);
+ if (ret < 0)
return ret;
- }
ret = p54_parse_firmware(dev, priv->firmware);
if (ret) {
- release_firmware(priv->firmware);
+ release_driver_data(priv->firmware);
return ret;
}
-
return 0;
}
-static int p54spi_request_eeprom(struct ieee80211_hw *dev)
+#ifdef CONFIG_P54_SPI_DEFAULT_EEPROM
+static int p54spi_load_eeprom_default(void *context)
{
- struct p54s_priv *priv = dev->priv;
- const struct firmware *eeprom;
- int ret;
+ struct p54s_priv *priv = context;
+ struct ieee80211_hw *dev = priv->hw;
- /* allow users to customize their eeprom.
- */
+ dev_info(&priv->spi->dev, "loading default eeprom...\n");
+ return p54_parse_eeprom(dev, (void *) p54spi_eeprom,
+ sizeof(p54spi_eeprom));
+}
+#endif
- ret = request_firmware_direct(&eeprom, "3826.eeprom", &priv->spi->dev);
- if (ret < 0) {
+static int p54spi_load_eeprom_cb(void *context,
+ const struct driver_data *driver_data)
+{
+ struct p54s_priv *priv = context;
+ struct ieee80211_hw *dev = priv->hw;
+
+ dev_info(&priv->spi->dev, "loading user eeprom...\n");
+ return p54_parse_eeprom(dev, (void *) driver_data->data,
+ (int)driver_data->size);
+}
+static int p54spi_request_eeprom(struct ieee80211_hw *dev)
+{
+ struct p54s_priv *priv = dev->priv;
+ const struct driver_data_req_params req_params = {
+ DRIVER_DATA_DEFAULT_SYNC(p54spi_load_eeprom_cb, priv),
#ifdef CONFIG_P54_SPI_DEFAULT_EEPROM
- dev_info(&priv->spi->dev, "loading default eeprom...\n");
- ret = p54_parse_eeprom(dev, (void *) p54spi_eeprom,
- sizeof(p54spi_eeprom));
-#else
- dev_err(&priv->spi->dev, "Failed to request user eeprom\n");
-#endif /* CONFIG_P54_SPI_DEFAULT_EEPROM */
- } else {
- dev_info(&priv->spi->dev, "loading user eeprom...\n");
- ret = p54_parse_eeprom(dev, (void *) eeprom->data,
- (int)eeprom->size);
- release_firmware(eeprom);
- }
- return ret;
+ DRIVER_DATA_SYNC_OPT_CB(p54spi_load_eeprom_default, priv),
+#endif
+ };
+ /*
+ * allow users to customize their eeprom.
+ */
+ return driver_data_request("3826.eeprom", &req_params,
+ &priv->spi->dev);
}
static int p54spi_upload_firmware(struct ieee80211_hw *dev)
@@ -692,7 +700,7 @@ static int p54spi_remove(struct spi_device *spi)
gpio_free(p54spi_gpio_power);
gpio_free(p54spi_gpio_irq);
- release_firmware(priv->firmware);
+ release_driver_data(priv->firmware);
mutex_destroy(&priv->mutex);
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