diff mbox series

[next] dma: Add devm_dma_request_chan()

Message ID 20241220131350.544009-1-csokas.bence@prolan.hu (mailing list archive)
State New
Headers show
Series [next] dma: Add devm_dma_request_chan() | expand

Commit Message

Bence Csókás Dec. 20, 2024, 1:13 p.m. UTC 
Expand the arsenal of devm functions for DMA
devices, this time for requesting channels.

Signed-off-by: Bence Csókás <csokas.bence@prolan.hu>
---
 drivers/dma/dmaengine.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

Comments

kernel test robot Dec. 21, 2024, 9:19 a.m. UTC | #1 
Hi Bence,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20241220]

url:    https://github.com/intel-lab-lkp/linux/commits/Bence-Cs-k-s/dma-Add-devm_dma_request_chan/20241220-211523
base:   next-20241220
patch link:    https://lore.kernel.org/r/20241220131350.544009-1-csokas.bence%40prolan.hu
patch subject: [PATCH next] dma: Add devm_dma_request_chan()
config: x86_64-buildonly-randconfig-002-20241221 (https://download.01.org/0day-ci/archive/20241221/202412211953.UwS2Qw11-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241221/202412211953.UwS2Qw11-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412211953.UwS2Qw11-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/dma/dmaengine.c:944:18: warning: no previous prototype for 'devm_dma_request_chan' [-Wmissing-prototypes]
     944 | struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
         |                  ^~~~~~~~~~~~~~~~~~~~~
   drivers/dma/dmaengine.c: In function 'devm_dma_request_chan':
>> drivers/dma/dmaengine.c:953:32: warning: passing argument 1 of 'PTR_ERR' makes pointer from integer without a cast [-Wint-conversion]
     953 |                 return PTR_ERR(ret);
         |                                ^~~
         |                                |
         |                                int
   In file included from arch/x86/include/asm/processor.h:36,
                    from include/linux/sched.h:13,
                    from include/linux/ratelimit.h:6,
                    from include/linux/dev_printk.h:16,
                    from include/linux/device.h:15,
                    from include/linux/platform_device.h:13,
                    from drivers/dma/dmaengine.c:34:
   include/linux/err.h:52:61: note: expected 'const void *' but argument is of type 'int'
      52 | static inline long __must_check PTR_ERR(__force const void *ptr)
         |                                                 ~~~~~~~~~~~~^~~
>> drivers/dma/dmaengine.c:953:24: warning: returning 'long int' from a function with return type 'struct dma_chan *' makes pointer from integer without a cast [-Wint-conversion]
     953 |                 return PTR_ERR(ret);
         |                        ^~~~~~~~~~~~


vim +/devm_dma_request_chan +944 drivers/dma/dmaengine.c

   933	
   934	/**
   935	 * devm_dma_request_chan - try to allocate an exclusive slave channel
   936	 * @dev:	pointer to client device structure
   937	 * @name:	slave channel name
   938	 *
   939	 * Returns pointer to appropriate DMA channel on success or an error pointer.
   940	 *
   941	 * The operation is managed and will be undone on driver detach.
   942	 */
   943	
 > 944	struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
   945	{
   946		struct dma_chan *chan = dma_request_chan(dev, name);
   947		int ret = 0;
   948	
   949		if (!IS_ERR(chan))
   950			ret = devm_add_action_or_reset(dev, dmaenginem_release_channel, chan);
   951	
   952		if (ret)
 > 953			return PTR_ERR(ret);
   954	
   955		return chan;
   956	}
   957	EXPORT_SYMBOL_GPL(devm_dma_request_chan);
   958
kernel test robot Dec. 21, 2024, 10:01 a.m. UTC | #2 
Hi Bence,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20241220]

url:    https://github.com/intel-lab-lkp/linux/commits/Bence-Cs-k-s/dma-Add-devm_dma_request_chan/20241220-211523
base:   next-20241220
patch link:    https://lore.kernel.org/r/20241220131350.544009-1-csokas.bence%40prolan.hu
patch subject: [PATCH next] dma: Add devm_dma_request_chan()
config: arm-randconfig-002-20241221 (https://download.01.org/0day-ci/archive/20241221/202412211754.Jh1oIu6A-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241221/202412211754.Jh1oIu6A-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412211754.Jh1oIu6A-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/dma/dmaengine.c:944:18: warning: no previous prototype for 'devm_dma_request_chan' [-Wmissing-prototypes]
     944 | struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
         |                  ^~~~~~~~~~~~~~~~~~~~~
   drivers/dma/dmaengine.c: In function 'devm_dma_request_chan':
>> drivers/dma/dmaengine.c:953:32: error: passing argument 1 of 'PTR_ERR' makes pointer from integer without a cast [-Wint-conversion]
     953 |                 return PTR_ERR(ret);
         |                                ^~~
         |                                |
         |                                int
   In file included from include/linux/string.h:10,
                    from include/linux/bitmap.h:13,
                    from include/linux/cpumask.h:12,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:63,
                    from include/linux/sched.h:2182,
                    from include/linux/ratelimit.h:6,
                    from include/linux/dev_printk.h:16,
                    from include/linux/device.h:15,
                    from include/linux/platform_device.h:13,
                    from drivers/dma/dmaengine.c:34:
   include/linux/err.h:52:61: note: expected 'const void *' but argument is of type 'int'
      52 | static inline long __must_check PTR_ERR(__force const void *ptr)
         |                                                 ~~~~~~~~~~~~^~~
>> drivers/dma/dmaengine.c:953:24: error: returning 'long int' from a function with return type 'struct dma_chan *' makes pointer from integer without a cast [-Wint-conversion]
     953 |                 return PTR_ERR(ret);
         |                        ^~~~~~~~~~~~


vim +/PTR_ERR +953 drivers/dma/dmaengine.c

   933	
   934	/**
   935	 * devm_dma_request_chan - try to allocate an exclusive slave channel
   936	 * @dev:	pointer to client device structure
   937	 * @name:	slave channel name
   938	 *
   939	 * Returns pointer to appropriate DMA channel on success or an error pointer.
   940	 *
   941	 * The operation is managed and will be undone on driver detach.
   942	 */
   943	
   944	struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
   945	{
   946		struct dma_chan *chan = dma_request_chan(dev, name);
   947		int ret = 0;
   948	
   949		if (!IS_ERR(chan))
   950			ret = devm_add_action_or_reset(dev, dmaenginem_release_channel, chan);
   951	
   952		if (ret)
 > 953			return PTR_ERR(ret);
   954	
   955		return chan;
   956	}
   957	EXPORT_SYMBOL_GPL(devm_dma_request_chan);
   958
kernel test robot Dec. 21, 2024, 10:01 a.m. UTC | #3 
Hi Bence,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20241220]

url:    https://github.com/intel-lab-lkp/linux/commits/Bence-Cs-k-s/dma-Add-devm_dma_request_chan/20241220-211523
base:   next-20241220
patch link:    https://lore.kernel.org/r/20241220131350.544009-1-csokas.bence%40prolan.hu
patch subject: [PATCH next] dma: Add devm_dma_request_chan()
config: i386-buildonly-randconfig-004-20241221 (https://download.01.org/0day-ci/archive/20241221/202412211736.wXS6zm9z-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241221/202412211736.wXS6zm9z-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412211736.wXS6zm9z-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

>> drivers/dma/dmaengine.c:953:18: error: incompatible integer to pointer conversion passing 'int' to parameter of type 'const void *' [-Wint-conversion]
     953 |                 return PTR_ERR(ret);
         |                                ^~~
   include/linux/err.h:52:61: note: passing argument to parameter 'ptr' here
      52 | static inline long __must_check PTR_ERR(__force const void *ptr)
         |                                                             ^
>> drivers/dma/dmaengine.c:953:10: error: incompatible integer to pointer conversion returning 'long' from a function with result type 'struct dma_chan *' [-Wint-conversion]
     953 |                 return PTR_ERR(ret);
         |                        ^~~~~~~~~~~~
>> drivers/dma/dmaengine.c:944:18: warning: no previous prototype for function 'devm_dma_request_chan' [-Wmissing-prototypes]
     944 | struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
         |                  ^
   drivers/dma/dmaengine.c:944:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     944 | struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
         | ^
         | static 
   1 warning and 2 errors generated.


vim +953 drivers/dma/dmaengine.c

   933	
   934	/**
   935	 * devm_dma_request_chan - try to allocate an exclusive slave channel
   936	 * @dev:	pointer to client device structure
   937	 * @name:	slave channel name
   938	 *
   939	 * Returns pointer to appropriate DMA channel on success or an error pointer.
   940	 *
   941	 * The operation is managed and will be undone on driver detach.
   942	 */
   943	
 > 944	struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
   945	{
   946		struct dma_chan *chan = dma_request_chan(dev, name);
   947		int ret = 0;
   948	
   949		if (!IS_ERR(chan))
   950			ret = devm_add_action_or_reset(dev, dmaenginem_release_channel, chan);
   951	
   952		if (ret)
 > 953			return PTR_ERR(ret);
   954	
   955		return chan;
   956	}
   957	EXPORT_SYMBOL_GPL(devm_dma_request_chan);
   958
diff mbox series

Patch

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index c1357d7f3dc6..51c41664838d 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -926,6 +926,36 @@  void dma_release_channel(struct dma_chan *chan)
 }
 EXPORT_SYMBOL_GPL(dma_release_channel);
 
+static void dmaenginem_release_channel(void *chan)
+{
+	dma_release_channel(chan);
+}
+
+/**
+ * devm_dma_request_chan - try to allocate an exclusive slave channel
+ * @dev:	pointer to client device structure
+ * @name:	slave channel name
+ *
+ * Returns pointer to appropriate DMA channel on success or an error pointer.
+ *
+ * The operation is managed and will be undone on driver detach.
+ */
+
+struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
+{
+	struct dma_chan *chan = dma_request_chan(dev, name);
+	int ret = 0;
+
+	if (!IS_ERR(chan))
+		ret = devm_add_action_or_reset(dev, dmaenginem_release_channel, chan);
+
+	if (ret)
+		return PTR_ERR(ret);
+
+	return chan;
+}
+EXPORT_SYMBOL_GPL(devm_dma_request_chan);
+
 /**
  * dmaengine_get - register interest in dma_channels
  */