On 11/10/2014 06:15 AM, Alexey Charkov wrote:
2014-11-10 1:18 GMT+03:00 lautriv <lautriv@xxxxxxxxxxxx>:
On 11/09/2014 10:55 PM, Fabio Estevam wrote:
On Sun, Nov 9, 2014 at 7:12 PM, Alexey Charkov <alchark@xxxxxxxxx> wrote:
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ ret = -ENODEV;
+ goto fail1;
You could save this NULL check...
+ }
mmc = mmc_alloc_host(sizeof(struct wmt_mci_priv), &pdev->dev);
if (!mmc) {
dev_err(&pdev->dev, "Failed to allocate mmc_host\n");
@@ -813,7 +819,7 @@ static int wmt_mci_probe(struct platform_device
*pdev)
if (of_get_property(np, "cd-inverted", NULL))
priv->cd_inverted = 1;
- priv->sdmmc_base = of_iomap(np, 0);
If you move ' res = platform_get_resource' right here as
devm_ioremap_resource() already does the NULL check.
+ priv->sdmmc_base = devm_ioremap_resource(&pdev->dev, res);
if (!priv->sdmmc_base) {
dev_err(&pdev->dev, "Failed to map IO space\n");
ret = -ENOMEM;
This was the original intention but it would fall between the failX jumps, i
discussed that with Alexey and we decided to change it with the cleanup to
hold this patch small.
I think Fabio means something slightly different than what we
discussed. We haven't realized that the first thing
devm_ioremap_resource does is exactly that (!res) check, so we can
skip ours altogether.
Looking at the function code a bit closer, we should also make the
check look like "if (IS_ERR(priv->sdmmc_base)", kill the dev_err call
(as it's also done internally), and then just do "ret =
PTR_ERR(priv->sdmmc_base)" and jump to the label.
Thanks a lot,
Alexey
Sorry for the delay, 8880's are used to crash a lot since
we have not enought information ;)
Attached a changed patch which will hopefully meet all needs.
>From 7c8ebb55fde8786cd16d95659ff73675bedc287c Mon Sep 17 00:00:00 2001
From: Helmut Stengele <lautriv@xxxxxxxxxxxx>
Date: Mon, 10 Nov 2014 11:26:51 +0100
Subject: [PATCH] mmc: vt8500: change resource-mapping to devm_*
Current code calls release_mem_region upon module unload
without requesting the region first. This patch fixes it
by moving to a devres-based ioremap implementation, which
handles requesting and releasing memory region internally.
This also makes the error/unload paths a bit simpler.
Signed-off-by: Helmut Stengele <lautriv@xxxxxxxxxxxx>
---
drivers/mmc/host/wmt-sdmmc.c | 16 +++++-----------
1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/drivers/mmc/host/wmt-sdmmc.c b/drivers/mmc/host/wmt-sdmmc.c
index 54181b4..f874d36 100644
--- a/drivers/mmc/host/wmt-sdmmc.c
+++ b/drivers/mmc/host/wmt-sdmmc.c
@@ -759,6 +759,7 @@ static int wmt_mci_probe(struct platform_device *pdev)
const struct wmt_mci_caps *wmt_caps;
int ret;
int regular_irq, dma_irq;
+ struct resource *res;
if (!of_id || !of_id->data) {
dev_err(&pdev->dev, "Controller capabilities data missing\n");
@@ -813,10 +814,11 @@ static int wmt_mci_probe(struct platform_device *pdev)
if (of_get_property(np, "cd-inverted", NULL))
priv->cd_inverted = 1;
- priv->sdmmc_base = of_iomap(np, 0);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->sdmmc_base = devm_ioremap_resource(&pdev->dev, res);
if (!priv->sdmmc_base) {
dev_err(&pdev->dev, "Failed to map IO space\n");
- ret = -ENOMEM;
+ ret = PTR_ERR(priv->sdmmc_base);
goto fail2;
}
@@ -826,7 +828,7 @@ static int wmt_mci_probe(struct platform_device *pdev)
ret = request_irq(regular_irq, wmt_mci_regular_isr, 0, "sdmmc", priv);
if (ret) {
dev_err(&pdev->dev, "Register regular IRQ fail\n");
- goto fail3;
+ goto fail2;
}
ret = request_irq(dma_irq, wmt_mci_dma_isr, 0, "sdmmc", priv);
@@ -869,8 +871,6 @@ fail5:
free_irq(dma_irq, priv);
fail4:
free_irq(regular_irq, priv);
-fail3:
- iounmap(priv->sdmmc_base);
fail2:
mmc_free_host(mmc);
fail1:
@@ -881,7 +881,6 @@ static int wmt_mci_remove(struct platform_device *pdev)
{
struct mmc_host *mmc;
struct wmt_mci_priv *priv;
- struct resource *res;
u32 reg_tmp;
mmc = platform_get_drvdata(pdev);
@@ -904,14 +903,9 @@ static int wmt_mci_remove(struct platform_device *pdev)
free_irq(priv->irq_regular, priv);
free_irq(priv->irq_dma, priv);
- iounmap(priv->sdmmc_base);
-
clk_disable_unprepare(priv->clk_sdmmc);
clk_put(priv->clk_sdmmc);
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- release_mem_region(res->start, resource_size(res));
-
mmc_free_host(mmc);
dev_info(&pdev->dev, "WMT MCI device removed\n");
--
1.7.10.4
