From: Andrzej Hajda <a.hajda@samsung.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Andrzej Hajda <a.hajda@samsung.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, andy.shevchenko@gmail.com,
Mark Brown <broonie@kernel.org>,
Russell King - ARM Linux <linux@armlinux.org.uk>,
Neil Armstrong <narmstrong@baylibre.com>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@siol.net>,
Daniel Vetter <daniel@ffwll.ch>,
dri-devel@lists.freedesktop.org (open list:DRM DRIVERS)
Subject: [RESEND PATCH v5 1/5] driver core: add probe_err log helper
Date: Wed, 24 Jun 2020 13:41:23 +0200 [thread overview]
Message-ID: <20200624114127.3016-2-a.hajda@samsung.com> (raw)
In-Reply-To: <20200624114127.3016-1-a.hajda@samsung.com>
During probe every time driver gets resource it should usually check for error
printk some message if it is not -EPROBE_DEFER and return the error. This
pattern is simple but requires adding few lines after any resource acquisition
code, as a result it is often omited or implemented only partially.
probe_err helps to replace such code sequences with simple call, so code:
if (err != -EPROBE_DEFER)
dev_err(dev, ...);
return err;
becomes:
return probe_err(dev, err, ...);
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
drivers/base/core.c | 39 +++++++++++++++++++++++++++++++++++++++
include/linux/device.h | 3 +++
2 files changed, 42 insertions(+)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 67d39a90b45c..ee9da66bff1b 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3953,6 +3953,45 @@ define_dev_printk_level(_dev_info, KERN_INFO);
#endif
+/**
+ * probe_err - 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 message if the error is not -EPROBE_DEFER and propagate it.
+ * It replaces code sequence:
+ * if (err != -EPROBE_DEFER)
+ * dev_err(dev, ...);
+ * return err;
+ * with
+ * return probe_err(dev, err, ...);
+ *
+ * Returns @err.
+ *
+ */
+int probe_err(const struct device *dev, int err, const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ if (err == -EPROBE_DEFER)
+ return err;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ dev_err(dev, "error %d: %pV", err, &vaf);
+
+ va_end(args);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(probe_err);
+
static inline bool fwnode_is_primary(struct fwnode_handle *fwnode)
{
return fwnode && !IS_ERR(fwnode->secondary);
diff --git a/include/linux/device.h b/include/linux/device.h
index 15460a5ac024..40a90d9bf799 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -964,6 +964,9 @@ void device_link_remove(void *consumer, struct device *supplier);
void device_links_supplier_sync_state_pause(void);
void device_links_supplier_sync_state_resume(void);
+extern __printf(3, 4)
+int probe_err(const struct device *dev, int err, const char *fmt, ...);
+
/* Create alias, so I can be autoloaded. */
#define MODULE_ALIAS_CHARDEV(major,minor) \
MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
--
2.17.1
next prev parent reply other threads:[~2020-06-24 11:42 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200624114134eucas1p2799e0ae76fcb026a0e4bcccc2026b732@eucas1p2.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 0/5] driver core: add probe error check helper Andrzej Hajda
[not found] ` <CGME20200624114135eucas1p26e2e4683d60cebdce7acd55177013992@eucas1p2.samsung.com>
2020-06-24 11:41 ` Andrzej Hajda [this message]
2020-06-24 11:52 ` [RESEND PATCH v5 1/5] driver core: add probe_err log helper Rafael J. Wysocki
2020-06-24 12:31 ` Greg Kroah-Hartman
2020-06-24 13:23 ` Laurent Pinchart
2020-06-24 14:04 ` Andrzej Hajda
2020-06-24 13:27 ` Mark Brown
2020-06-24 13:45 ` Andy Shevchenko
2020-06-24 14:02 ` Mark Brown
2020-06-24 15:00 ` Robin Murphy
2020-06-24 15:28 ` Mark Brown
[not found] ` <CGME20200624114136eucas1p1a3a31d95d86754201c7965f26ccd5de0@eucas1p1.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 2/5] driver core: add deferring probe reason to devices_deferred property Andrzej Hajda
2020-06-24 12:11 ` Rafael J. Wysocki
2020-06-24 13:28 ` Andrzej Hajda
2020-06-24 12:34 ` Greg Kroah-Hartman
2020-06-24 13:26 ` Andrzej Hajda
[not found] ` <CGME20200624114136eucas1p1c84f81b1d78e2dbad7ac1b762f0a4b4f@eucas1p1.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 3/5] drivers core: allow probe_err accept integer and pointer types Andrzej Hajda
2020-06-24 12:14 ` Rafael J. Wysocki
2020-06-24 14:44 ` Andrzej Hajda
2020-06-24 14:55 ` Rafael J. Wysocki
2020-06-24 12:30 ` Greg Kroah-Hartman
2020-06-24 14:48 ` Andrzej Hajda
2020-06-24 12:37 ` Robin Murphy
2020-06-24 12:55 ` Andy Shevchenko
2020-06-24 14:25 ` Robin Murphy
2020-06-24 15:04 ` Mark Brown
2020-06-24 15:16 ` Robin Murphy
2020-06-24 19:39 ` Andrzej Hajda
2020-06-25 8:41 ` Andy Shevchenko
2020-06-25 10:19 ` Andrzej Hajda
2020-06-24 13:29 ` Laurent Pinchart
2020-06-24 12:53 ` Andy Shevchenko
2020-06-24 13:12 ` Andrzej Hajda
[not found] ` <CGME20200624114137eucas1p13599d33a0c4a9abf7708bf8c8e77264b@eucas1p1.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 4/5] drm/bridge/sii8620: fix resource acquisition error handling Andrzej Hajda
2020-06-24 13:25 ` Mark Brown
[not found] ` <cf95aac3-fef5-29d0-d94e-ce6cce4ccdb4@samsung.com>
2020-06-24 14:11 ` Mark Brown
[not found] ` <CGME20200624114138eucas1p262505da3ad1067720080d20209ff32de@eucas1p2.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 5/5] drm/bridge: lvds-codec: simplify error handling code Andrzej Hajda
2020-06-24 13:33 ` Laurent Pinchart
2020-06-24 14:03 ` Andrzej Hajda
2020-06-24 21:18 ` Laurent Pinchart
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