brcmfmac: modify __brcmf_err() to take bus as a parameter

So far __brcmf_err() was using pr_err() which didn't allow identifying
device that was affected by an error. It's crucial for systems with more
than 1 device supported by brcmfmac (a common case for home routers).

This change allows passing struct brcmf_bus to the __brcmf_err(). That
struct has been agreed to be the most common one. It allows accessing
struct device easily & using dev_err() printing helper.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c

@@ -350,7 +350,7 @@ int brcmf_c_preinit_dcmds(struct brcmf_if *ifp)
 }
 
 #ifndef CONFIG_BRCM_TRACING
-void __brcmf_err(const char *func, const char *fmt, ...)
+void __brcmf_err(struct brcmf_bus *bus, const char *func, const char *fmt, ...)
 {
 	struct va_format vaf;
 	va_list args;
@@ -359,6 +359,9 @@ void __brcmf_err(const char *func, const char *fmt, ...)
 
 	vaf.fmt = fmt;
 	vaf.va = &args;
+	if (bus)
+		dev_err(bus->dev, "%s: %pV", func, &vaf);
+	else
 		pr_err("%s: %pV", func, &vaf);
 
 	va_end(args);

drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h

@@ -45,8 +45,10 @@
 #undef pr_fmt
 #define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt
 
-__printf(2, 3)
-void __brcmf_err(const char *func, const char *fmt, ...);
+struct brcmf_bus;
+
+__printf(3, 4)
+void __brcmf_err(struct brcmf_bus *bus, const char *func, const char *fmt, ...);
 /* Macro for error messages. When debugging / tracing the driver all error
  * messages are important to us.
  */
@@ -55,7 +57,7 @@ void __brcmf_err(const char *func, const char *fmt, ...);
 		if (IS_ENABLED(CONFIG_BRCMDBG) ||			\
 		    IS_ENABLED(CONFIG_BRCM_TRACING) ||			\
 		    net_ratelimit())					\
-			__brcmf_err(__func__, fmt, ##__VA_ARGS__);	\
+			__brcmf_err(NULL, __func__, fmt, ##__VA_ARGS__);\
 	} while (0)
 
 #if defined(DEBUG) || defined(CONFIG_BRCM_TRACING)

drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.c

@@ -14,14 +14,16 @@
  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <linux/device.h>
 #include <linux/module.h> /* bug in tracepoint.h, it should include this */
 
 #ifndef __CHECKER__
 #define CREATE_TRACE_POINTS
+#include "bus.h"
 #include "tracepoint.h"
 #include "debug.h"
 
-void __brcmf_err(const char *func, const char *fmt, ...)
+void __brcmf_err(struct brcmf_bus *bus, const char *func, const char *fmt, ...)
 {
 	struct va_format vaf = {
 		.fmt = fmt,
@@ -30,6 +32,9 @@ void __brcmf_err(const char *func, const char *fmt, ...)
 
 	va_start(args, fmt);
 	vaf.va = &args;
+	if (bus)
+		dev_err(bus->dev, "%s: %pV", func, &vaf);
+	else
 		pr_err("%s: %pV", func, &vaf);
 	trace_brcmf_err(func, &vaf);
 	va_end(args);