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Message-ID: <20251023145432.164696-1-rakuram.e96@gmail.com>
Date: Thu, 23 Oct 2025 20:24:32 +0530
From: Rakuram Eswaran <rakuram.e96@...il.com>
To: ulf.hansson@...aro.org,
u.kleine-koenig@...libre.com
Cc: chenhuacai@...nel.org,
dan.carpenter@...aro.org,
david.hunter.linux@...il.com,
khalid@...nel.org,
zhoubinbin@...ngson.cn,
linux-kernel-mentees@...ts.linux.dev,
linux-kernel@...r.kernel.org,
linux-mmc@...r.kernel.org,
lkp@...el.com,
rakuram.e96@...il.com,
skhan@...uxfoundation.org
Subject: [PATCH v3] mmc: pxamci: Simplify pxamci_probe() error handling using devm APIs
This patch refactors pxamci_probe() to use devm-managed resource
allocation (e.g. devm_dma_request_chan) and dev_err_probe() for
improved readability and automatic cleanup on probe failure.
It also removes redundant NULL assignments and manual resource release
logic from pxamci_probe(), and eliminates the corresponding release
calls from pxamci_remove().
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/r/202510041841.pRlunIfl-lkp@intel.com/
Fixes: 58c40f3faf742c ("mmc: pxamci: Use devm_mmc_alloc_host() helper")
Suggested-by: Uwe Kleine-König <u.kleine-koenig@...libre.com>
Signed-off-by: Rakuram Eswaran <rakuram.e96@...il.com>
---
Changes since v2:
- Dropped redundant dma_release_channel() calls from pxamci_remove() as
devm_dma_request_chan() automatically handles resource cleanup.
- Added link to v2 for reference:
https://lore.kernel.org/linux-mmc/20251014184657.111144-1-rakuram.e96@gmail.com/
Changes since v1:
Following Uwe Kleine-König’s suggestion:
- Replaced dma_request_chan() with devm_dma_request_chan() to make DMA
channel allocation devm-managed and avoid manual release paths.
- Adopted dev_err_probe() for improved error reporting and consistent
probe failure handling.
- Removed redundant NULL assignments and obsolete goto-based cleanup logic.
- Updated commit message to better describe the intent of the change.
- Added link to v1 for reference:
https://lore.kernel.org/linux-mmc/20251007161948.12442-1-rakuram.e96@gmail.com/
Testing note:
I do not have access to appropriate hardware for runtime testing.
Any help verifying on actual hardware would be appreciated.
Build and Analysis:
This patch was compiled against the configuration file reported by
0day CI in the above link (config: s390-randconfig-r071-20251004) using
`s390x-linux-gnu-gcc (Ubuntu 14.2.0-19ubuntu2) 14.2.0`.
Static analysis was performed with Smatch to ensure the reported warning
no longer reproduces after applying this fix.
Command used for verification:
ARCH=s390 CROSS_COMPILE=s390x-linux-gnu- \
~/project/smatch/smatch_scripts/kchecker ./drivers/mmc/host/pxamci.c
drivers/mmc/host/pxamci.c | 56 +++++++++++++--------------------------
1 file changed, 18 insertions(+), 38 deletions(-)
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 26d03352af63..b5ea058ed467 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -652,10 +652,9 @@ static int pxamci_probe(struct platform_device *pdev)
host->clkrt = CLKRT_OFF;
host->clk = devm_clk_get(dev, NULL);
- if (IS_ERR(host->clk)) {
- host->clk = NULL;
- return PTR_ERR(host->clk);
- }
+ if (IS_ERR(host->clk))
+ return dev_err_probe(dev, PTR_ERR(host->clk),
+ "Failed to acquire clock\n");
host->clkrate = clk_get_rate(host->clk);
@@ -703,46 +702,37 @@ static int pxamci_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, mmc);
- host->dma_chan_rx = dma_request_chan(dev, "rx");
- if (IS_ERR(host->dma_chan_rx)) {
- host->dma_chan_rx = NULL;
+ host->dma_chan_rx = devm_dma_request_chan(dev, "rx");
+ if (IS_ERR(host->dma_chan_rx))
return dev_err_probe(dev, PTR_ERR(host->dma_chan_rx),
"unable to request rx dma channel\n");
- }
- host->dma_chan_tx = dma_request_chan(dev, "tx");
- if (IS_ERR(host->dma_chan_tx)) {
- dev_err(dev, "unable to request tx dma channel\n");
- ret = PTR_ERR(host->dma_chan_tx);
- host->dma_chan_tx = NULL;
- goto out;
- }
+
+ host->dma_chan_tx = devm_dma_request_chan(dev, "tx");
+ if (IS_ERR(host->dma_chan_tx))
+ return dev_err_probe(dev, PTR_ERR(host->dma_chan_tx),
+ "unable to request tx dma channel\n");
if (host->pdata) {
host->detect_delay_ms = host->pdata->detect_delay_ms;
host->power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
- if (IS_ERR(host->power)) {
- ret = PTR_ERR(host->power);
- dev_err(dev, "Failed requesting gpio_power\n");
- goto out;
- }
+ if (IS_ERR(host->power))
+ return dev_err_probe(dev, PTR_ERR(host->power),
+ "Failed requesting gpio_power\n");
/* FIXME: should we pass detection delay to debounce? */
ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
- if (ret && ret != -ENOENT) {
- dev_err(dev, "Failed requesting gpio_cd\n");
- goto out;
- }
+ if (ret && ret != -ENOENT)
+ return dev_err_probe(dev, ret, "Failed requesting gpio_cd\n");
if (!host->pdata->gpio_card_ro_invert)
mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0);
- if (ret && ret != -ENOENT) {
- dev_err(dev, "Failed requesting gpio_ro\n");
- goto out;
- }
+ if (ret && ret != -ENOENT)
+ return dev_err_probe(dev, ret, "Failed requesting gpio_ro\n");
+
if (!ret)
host->use_ro_gpio = true;
@@ -759,16 +749,8 @@ static int pxamci_probe(struct platform_device *pdev)
if (ret) {
if (host->pdata && host->pdata->exit)
host->pdata->exit(dev, mmc);
- goto out;
}
- return 0;
-
-out:
- if (host->dma_chan_rx)
- dma_release_channel(host->dma_chan_rx);
- if (host->dma_chan_tx)
- dma_release_channel(host->dma_chan_tx);
return ret;
}
@@ -791,8 +773,6 @@ static void pxamci_remove(struct platform_device *pdev)
dmaengine_terminate_all(host->dma_chan_rx);
dmaengine_terminate_all(host->dma_chan_tx);
- dma_release_channel(host->dma_chan_rx);
- dma_release_channel(host->dma_chan_tx);
}
}
--
2.48.1
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