Some drivers can still provide their functionality to a certain extent even
some of their resource acquisitions eventually fail. In such cases, emitting
errors isn't the desired action, but warnings should be emitted instead.
To solve this, introduce dev_warn_probe() as a new device probe log helper,
which behaves identically as the already existing dev_err_probe(), while it
produces warnings instead of errors. The intended use is with the resources
that are actually optional for a particular driver.
While there, copyedit the kerneldoc for dev_err_probe() a bit, to simplify
its wording a bit, and reuse it as the kerneldoc for dev_warn_probe(), with
the necessary wording adjustments, of course.
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
---
drivers/base/core.c | 110 ++++++++++++++++++++++++++++---------
include/linux/dev_printk.h | 1 +
2 files changed, 84 insertions(+), 27 deletions(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8c0733d3aad8..a4592b7ffa5d 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -4982,71 +4982,127 @@ define_dev_printk_level(_dev_info, KERN_INFO);
#endif
+static int dev_probe_failed(const struct device *dev, int err, bool fatal,
+ const char *fmt, va_list args)
+{
+ struct va_format vaf;
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ switch (err) {
+ case -EPROBE_DEFER:
+ device_set_deferred_probe_reason(dev, &vaf);
+ dev_dbg(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
+ break;
+
+ case -ENOMEM:
+ /* Don't print anything on -ENOMEM, there's already enough output */
+ break;
+
+ default:
+ /* Log fatal final failures as errors, otherwise produce warnings */
+ if (fatal)
+ dev_err(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
+ else
+ dev_warn(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
+ break;
+ }
+
+ return err;
+}
+
/**
* dev_err_probe - probe error check and log helper
* @dev: the pointer to the struct device
* @err: error value to test
* @fmt: printf-style format string
* @...: arguments as specified in the format string
*
* This helper implements common pattern present in probe functions for error
* checking: print debug or error message depending if the error value is
* -EPROBE_DEFER and propagate error upwards.
* In case of -EPROBE_DEFER it sets also defer probe reason, which can be
* checked later by reading devices_deferred debugfs attribute.
- * It replaces code sequence::
+ * It replaces the following code sequence::
*
* if (err != -EPROBE_DEFER)
* dev_err(dev, ...);
* else
* dev_dbg(dev, ...);
* return err;
*
* with::
*
* return dev_err_probe(dev, err, ...);
*
- * Using this helper in your probe function is totally fine even if @err is
- * known to never be -EPROBE_DEFER.
+ * Using this helper in your probe function is totally fine even if @err
+ * is known to never be -EPROBE_DEFER.
* The benefit compared to a normal dev_err() is the standardized format
- * of the error code, it being emitted symbolically (i.e. you get "EAGAIN"
- * instead of "-35") and the fact that the error code is returned which allows
- * more compact error paths.
+ * of the error code, which is emitted symbolically (i.e. you get "EAGAIN"
+ * instead of "-35"), and having the error code returned allows more
+ * compact error paths.
*
* Returns @err.
*/
int dev_err_probe(const struct device *dev, int err, const char *fmt, ...)
{
- struct va_format vaf;
va_list args;
va_start(args, fmt);
- vaf.fmt = fmt;
- vaf.va = &args;
- switch (err) {
- case -EPROBE_DEFER:
- device_set_deferred_probe_reason(dev, &vaf);
- dev_dbg(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
- break;
+ /* Use dev_err() for logging when err doesn't equal -EPROBE_DEFER */
+ dev_probe_failed(dev, err, true, fmt, args);
- case -ENOMEM:
- /*
- * We don't print anything on -ENOMEM, there is already enough
- * output.
- */
- break;
+ va_end(args);
+}
+EXPORT_SYMBOL_GPL(dev_err_probe);
- default:
- dev_err(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
- break;
- }
+/**
+ * dev_warn_probe - probe error check and log helper
+ * @dev: the pointer to the struct device
+ * @err: error value to test
+ * @fmt: printf-style format string
+ * @...: arguments as specified in the format string
+ *
+ * This helper implements common pattern present in probe functions for error
+ * checking: print debug or warning message depending if the error value is
+ * -EPROBE_DEFER and propagate error upwards.
+ * In case of -EPROBE_DEFER it sets also defer probe reason, which can be
+ * checked later by reading devices_deferred debugfs attribute.
+ * It replaces the following code sequence::
+ *
+ * if (err != -EPROBE_DEFER)
+ * dev_warn(dev, ...);
+ * else
+ * dev_dbg(dev, ...);
+ * return err;
+ *
+ * with::
+ *
+ * return dev_warn_probe(dev, err, ...);
+ *
+ * Using this helper in your probe function is totally fine even if @err
+ * is known to never be -EPROBE_DEFER.
+ * The benefit compared to a normal dev_warn() is the standardized format
+ * of the error code, which is emitted symbolically (i.e. you get "EAGAIN"
+ * instead of "-35"), and having the error code returned allows more
+ * compact error paths.
+ *
+ * Returns @err.
+ */
+int dev_warn_probe(const struct device *dev, int err, const char *fmt, ...)
+{
+ va_list args;
- va_end(args);
+ va_start(args, fmt);
- return err;
+ /* Use dev_warn() for logging when err doesn't equal -EPROBE_DEFER */
+ dev_probe_failed(dev, err, false, fmt, args);
+
+ va_end(args);
}
-EXPORT_SYMBOL_GPL(dev_err_probe);
+EXPORT_SYMBOL_GPL(dev_warn_probe);
static inline bool fwnode_is_primary(struct fwnode_handle *fwnode)
{
diff --git a/include/linux/dev_printk.h b/include/linux/dev_printk.h
index ca32b5bb28eb..eb2094e43050 100644
--- a/include/linux/dev_printk.h
+++ b/include/linux/dev_printk.h
@@ -276,6 +276,7 @@ do { \
dev_driver_string(dev), dev_name(dev), ## arg)
__printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
+__printf(3, 4) int dev_warn_probe(const struct device *dev, int err, const char *fmt, ...);
/* Simple helper for dev_err_probe() when ERR_PTR() is to be returned. */
#define dev_err_ptr_probe(dev, ___err, fmt, ...) \Hi Dragan,
kernel test robot noticed the following build errors:
[auto build test ERROR on rockchip/for-next]
[also build test ERROR on broonie-spi/for-next driver-core/driver-core-testing driver-core/driver-core-next driver-core/driver-core-linus linus/master v6.11 next-20240927]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Dragan-Simic/spi-rockchip-Perform-trivial-code-cleanups/20240928-121548
base: https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git for-next
patch link: https://lore.kernel.org/r/2fd9a60e0efe906dc7a203cd652c8d0b7f932470.1727496560.git.dsimic%40manjaro.org
patch subject: [PATCH v2 4/5] driver core: Add device probe log helper dev_warn_probe()
config: powerpc-allnoconfig (https://download.01.org/0day-ci/archive/20240929/202409290910.55WdSCMH-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240929/202409290910.55WdSCMH-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/202409290910.55WdSCMH-lkp@intel.com/
All errors (new ones prefixed by >>):
drivers/base/core.c: In function 'dev_probe_failed':
>> drivers/base/core.c:4988:16: error: assignment to '__va_list_tag (*)[1]' from incompatible pointer type '__va_list_tag **' [-Wincompatible-pointer-types]
4988 | vaf.va = &args;
| ^
drivers/base/core.c: In function 'dev_err_probe':
drivers/base/core.c:5055:1: warning: control reaches end of non-void function [-Wreturn-type]
5055 | }
| ^
drivers/base/core.c: In function 'dev_warn_probe':
drivers/base/core.c:5101:1: warning: control reaches end of non-void function [-Wreturn-type]
5101 | }
| ^
vim +4988 drivers/base/core.c
4981
4982 static int dev_probe_failed(const struct device *dev, int err, bool fatal,
4983 const char *fmt, va_list args)
4984 {
4985 struct va_format vaf;
4986
4987 vaf.fmt = fmt;
> 4988 vaf.va = &args;
4989
4990 switch (err) {
4991 case -EPROBE_DEFER:
4992 device_set_deferred_probe_reason(dev, &vaf);
4993 dev_dbg(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
4994 break;
4995
4996 case -ENOMEM:
4997 /* Don't print anything on -ENOMEM, there's already enough output */
4998 break;
4999
5000 default:
5001 /* Log fatal final failures as errors, otherwise produce warnings */
5002 if (fatal)
5003 dev_err(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
5004 else
5005 dev_warn(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
5006 break;
5007 }
5008
5009 return err;
5010 }
5011
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Dragan,
kernel test robot noticed the following build errors:
[auto build test ERROR on rockchip/for-next]
[also build test ERROR on broonie-spi/for-next driver-core/driver-core-testing driver-core/driver-core-next driver-core/driver-core-linus linus/master v6.11 next-20240927]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Dragan-Simic/spi-rockchip-Perform-trivial-code-cleanups/20240928-121548
base: https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git for-next
patch link: https://lore.kernel.org/r/2fd9a60e0efe906dc7a203cd652c8d0b7f932470.1727496560.git.dsimic%40manjaro.org
patch subject: [PATCH v2 4/5] driver core: Add device probe log helper dev_warn_probe()
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20240929/202409290914.ODQyF8lR-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 7773243d9916f98ba0ffce0c3a960e4aa9f03e81)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240929/202409290914.ODQyF8lR-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/202409290914.ODQyF8lR-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
In file included from drivers/base/core.c:11:
In file included from include/linux/acpi.h:14:
In file included from include/linux/device.h:32:
In file included from include/linux/device/driver.h:21:
In file included from include/linux/module.h:19:
In file included from include/linux/elf.h:6:
In file included from arch/s390/include/asm/elf.h:181:
In file included from arch/s390/include/asm/mmu_context.h:11:
In file included from arch/s390/include/asm/pgalloc.h:18:
In file included from include/linux/mm.h:2228:
include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
514 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
In file included from drivers/base/core.c:27:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:28:
In file included from include/linux/dma-mapping.h:11:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:93:
include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
548 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
561 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
| ^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
| ^
In file included from drivers/base/core.c:27:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:28:
In file included from include/linux/dma-mapping.h:11:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:93:
include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
574 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
| ^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
| ^
In file included from drivers/base/core.c:27:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:28:
In file included from include/linux/dma-mapping.h:11:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:93:
include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:693:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
693 | readsb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:701:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
701 | readsw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:709:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
709 | readsl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:718:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
718 | writesb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:727:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
727 | writesw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:736:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
736 | writesl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
>> drivers/base/core.c:4988:9: error: incompatible pointer types assigning to 'va_list *' (aka '__builtin_va_list *') from 'struct __va_list_tag **' [-Werror,-Wincompatible-pointer-types]
4988 | vaf.va = &args;
| ^ ~~~~~
>> drivers/base/core.c:5055:1: warning: non-void function does not return a value [-Wreturn-type]
5055 | }
| ^
drivers/base/core.c:5101:1: warning: non-void function does not return a value [-Wreturn-type]
5101 | }
| ^
15 warnings and 1 error generated.
vim +4988 drivers/base/core.c
4981
4982 static int dev_probe_failed(const struct device *dev, int err, bool fatal,
4983 const char *fmt, va_list args)
4984 {
4985 struct va_format vaf;
4986
4987 vaf.fmt = fmt;
> 4988 vaf.va = &args;
4989
4990 switch (err) {
4991 case -EPROBE_DEFER:
4992 device_set_deferred_probe_reason(dev, &vaf);
4993 dev_dbg(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
4994 break;
4995
4996 case -ENOMEM:
4997 /* Don't print anything on -ENOMEM, there's already enough output */
4998 break;
4999
5000 default:
5001 /* Log fatal final failures as errors, otherwise produce warnings */
5002 if (fatal)
5003 dev_err(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
5004 else
5005 dev_warn(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
5006 break;
5007 }
5008
5009 return err;
5010 }
5011
5012 /**
5013 * dev_err_probe - probe error check and log helper
5014 * @dev: the pointer to the struct device
5015 * @err: error value to test
5016 * @fmt: printf-style format string
5017 * @...: arguments as specified in the format string
5018 *
5019 * This helper implements common pattern present in probe functions for error
5020 * checking: print debug or error message depending if the error value is
5021 * -EPROBE_DEFER and propagate error upwards.
5022 * In case of -EPROBE_DEFER it sets also defer probe reason, which can be
5023 * checked later by reading devices_deferred debugfs attribute.
5024 * It replaces the following code sequence::
5025 *
5026 * if (err != -EPROBE_DEFER)
5027 * dev_err(dev, ...);
5028 * else
5029 * dev_dbg(dev, ...);
5030 * return err;
5031 *
5032 * with::
5033 *
5034 * return dev_err_probe(dev, err, ...);
5035 *
5036 * Using this helper in your probe function is totally fine even if @err
5037 * is known to never be -EPROBE_DEFER.
5038 * The benefit compared to a normal dev_err() is the standardized format
5039 * of the error code, which is emitted symbolically (i.e. you get "EAGAIN"
5040 * instead of "-35"), and having the error code returned allows more
5041 * compact error paths.
5042 *
5043 * Returns @err.
5044 */
5045 int dev_err_probe(const struct device *dev, int err, const char *fmt, ...)
5046 {
5047 va_list args;
5048
5049 va_start(args, fmt);
5050
5051 /* Use dev_err() for logging when err doesn't equal -EPROBE_DEFER */
5052 dev_probe_failed(dev, err, true, fmt, args);
5053
5054 va_end(args);
> 5055 }
5056 EXPORT_SYMBOL_GPL(dev_err_probe);
5057
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Dragan,
kernel test robot noticed the following build warnings:
[auto build test WARNING on rockchip/for-next]
[also build test WARNING on broonie-spi/for-next driver-core/driver-core-testing driver-core/driver-core-next driver-core/driver-core-linus linus/master v6.11 next-20240927]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Dragan-Simic/spi-rockchip-Perform-trivial-code-cleanups/20240928-121548
base: https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git for-next
patch link: https://lore.kernel.org/r/2fd9a60e0efe906dc7a203cd652c8d0b7f932470.1727496560.git.dsimic%40manjaro.org
patch subject: [PATCH v2 4/5] driver core: Add device probe log helper dev_warn_probe()
config: openrisc-allnoconfig (https://download.01.org/0day-ci/archive/20240929/202409290956.jwLrcN1S-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240929/202409290956.jwLrcN1S-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/202409290956.jwLrcN1S-lkp@intel.com/
All warnings (new ones prefixed by >>):
drivers/base/core.c: In function 'dev_err_probe':
>> drivers/base/core.c:5055:1: warning: control reaches end of non-void function [-Wreturn-type]
5055 | }
| ^
drivers/base/core.c: In function 'dev_warn_probe':
drivers/base/core.c:5101:1: warning: control reaches end of non-void function [-Wreturn-type]
5101 | }
| ^
vim +5055 drivers/base/core.c
5011
5012 /**
5013 * dev_err_probe - probe error check and log helper
5014 * @dev: the pointer to the struct device
5015 * @err: error value to test
5016 * @fmt: printf-style format string
5017 * @...: arguments as specified in the format string
5018 *
5019 * This helper implements common pattern present in probe functions for error
5020 * checking: print debug or error message depending if the error value is
5021 * -EPROBE_DEFER and propagate error upwards.
5022 * In case of -EPROBE_DEFER it sets also defer probe reason, which can be
5023 * checked later by reading devices_deferred debugfs attribute.
5024 * It replaces the following code sequence::
5025 *
5026 * if (err != -EPROBE_DEFER)
5027 * dev_err(dev, ...);
5028 * else
5029 * dev_dbg(dev, ...);
5030 * return err;
5031 *
5032 * with::
5033 *
5034 * return dev_err_probe(dev, err, ...);
5035 *
5036 * Using this helper in your probe function is totally fine even if @err
5037 * is known to never be -EPROBE_DEFER.
5038 * The benefit compared to a normal dev_err() is the standardized format
5039 * of the error code, which is emitted symbolically (i.e. you get "EAGAIN"
5040 * instead of "-35"), and having the error code returned allows more
5041 * compact error paths.
5042 *
5043 * Returns @err.
5044 */
5045 int dev_err_probe(const struct device *dev, int err, const char *fmt, ...)
5046 {
5047 va_list args;
5048
5049 va_start(args, fmt);
5050
5051 /* Use dev_err() for logging when err doesn't equal -EPROBE_DEFER */
5052 dev_probe_failed(dev, err, true, fmt, args);
5053
5054 va_end(args);
> 5055 }
5056 EXPORT_SYMBOL_GPL(dev_err_probe);
5057
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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