mac80211: brcmfmac: backport PSM watchdog improvements

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

package/kernel/mac80211/patches/365-0001-brcmfmac-check-brcmf_bus_get_memdump-result-for-erro.patch

+From f4737a62033d7f3e0db740c449fc62119da7ab8a Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Mon, 30 Jan 2017 16:09:51 +0100
+Subject: [PATCH] brcmfmac: check brcmf_bus_get_memdump result for error
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This method may be unsupported (see: USB bus) or may just fail (see:
+SDIO bus).
+While at it rework logic in brcmf_sdio_bus_get_memdump function to avoid
+too many conditional code nesting levels.
+
+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>
+---
+ .../wireless/broadcom/brcm80211/brcmfmac/debug.c   | 23 +++++++++++++++-------
+ 1 file changed, 16 insertions(+), 7 deletions(-)
+
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
+@@ -32,16 +32,25 @@ static int brcmf_debug_create_memdump(st
+ {
+ 	void *dump;
+ 	size_t ramsize;
++	int err;
+ 
+ 	ramsize = brcmf_bus_get_ramsize(bus);
+-	if (ramsize) {
+-		dump = vzalloc(len + ramsize);
+-		if (!dump)
+-			return -ENOMEM;
+-		memcpy(dump, data, len);
+-		brcmf_bus_get_memdump(bus, dump + len, ramsize);
+-		dev_coredumpv(bus->dev, dump, len + ramsize, GFP_KERNEL);
++	if (!ramsize)
++		return -ENOTSUPP;
++
++	dump = vzalloc(len + ramsize);
++	if (!dump)
++		return -ENOMEM;
++
++	memcpy(dump, data, len);
++	err = brcmf_bus_get_memdump(bus, dump + len, ramsize);
++	if (err) {
++		vfree(dump);
++		return err;
+ 	}
++
++	dev_coredumpv(bus->dev, dump, len + ramsize, GFP_KERNEL);
++
+ 	return 0;
+ }
+ 

package/kernel/mac80211/patches/365-0002-brcmfmac-be-more-verbose-when-PSM-s-watchdog-fires.patch

+From 36401cb7ffae731295a6dd1ce2b40d7ad74245f4 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Mon, 30 Jan 2017 16:09:52 +0100
+Subject: [PATCH] brcmfmac: be more verbose when PSM's watchdog fires
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+It's important to inform user so he knows things went wrong. He may also
+want to get memory dump for further debugging purposes.
+
+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/debug.c | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
+@@ -58,10 +58,18 @@ static int brcmf_debug_psm_watchdog_noti
+ 					   const struct brcmf_event_msg *evtmsg,
+ 					   void *data)
+ {
++	int err;
++
+ 	brcmf_dbg(TRACE, "enter: bsscfgidx=%d\n", ifp->bsscfgidx);
+ 
+-	return brcmf_debug_create_memdump(ifp->drvr->bus_if, data,
+-					  evtmsg->datalen);
++	brcmf_err("PSM's watchdog has fired!\n");
++
++	err = brcmf_debug_create_memdump(ifp->drvr->bus_if, data,
++					 evtmsg->datalen);
++	if (err)
++		brcmf_err("Failed to get memory dump, %d\n", err);
++
++	return err;
+ }
+ 
+ void brcmf_debugfs_init(void)