mac80211: brcmfmac: always print error when PSM's watchdog fires
authorRafał Miłecki <rafal@milecki.pl>
Wed, 1 Mar 2017 06:09:59 +0000 (07:09 +0100)
committerRafał Miłecki <rafal@milecki.pl>
Wed, 1 Mar 2017 06:10:48 +0000 (07:10 +0100)
This error is important enough to be displayed even without debugging.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
package/kernel/mac80211/patches/855-brcmfmac-always-print-error-when-PSM-s-watchdog-fire.patch [new file with mode: 0644]
package/kernel/mac80211/patches/860-brcmfmac-register-wiphy-s-during-module_init.patch

diff --git a/package/kernel/mac80211/patches/855-brcmfmac-always-print-error-when-PSM-s-watchdog-fire.patch b/package/kernel/mac80211/patches/855-brcmfmac-always-print-error-when-PSM-s-watchdog-fire.patch
new file mode 100644 (file)
index 0000000..51448e9
--- /dev/null
@@ -0,0 +1,147 @@
+From e374cb32e98fb49e17594424b0445d8438825413 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Fri, 24 Feb 2017 17:18:47 +0100
+Subject: [PATCH] brcmfmac: always print error when PSM's watchdog fires
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+So far we were attaching BRCMF_E_PSM_WATCHDOG event listener in
+brcmf_debug_attach which gets compiled only with CONFIG_BRCMDBG. This
+event means something went wrong and firmware / hardware usually can't
+be expected to work (reliably).
+
+Such a problem is significant for user experience so I believe we should
+print an error unconditionally (even with debugging disabled). What can
+be indeed optional is dumping bus memory as this is clearly part of
+debugging process.
+
+In the future we may also try to extend this listener by trying to
+recover from the error or at least signal it to the cfg80211.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+---
+ .../wireless/broadcom/brcm80211/brcmfmac/core.c    | 22 ++++++++++++++++++
+ .../wireless/broadcom/brcm80211/brcmfmac/debug.c   | 26 +++-------------------
+ .../wireless/broadcom/brcm80211/brcmfmac/debug.h   |  9 ++++++++
+ 3 files changed, 34 insertions(+), 23 deletions(-)
+
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
+@@ -748,6 +748,24 @@ void brcmf_remove_interface(struct brcmf
+       brcmf_del_if(ifp->drvr, ifp->bsscfgidx, rtnl_locked);
+ }
++static int brcmf_psm_watchdog_notify(struct brcmf_if *ifp,
++                                   const struct brcmf_event_msg *evtmsg,
++                                   void *data)
++{
++      int err;
++
++      brcmf_dbg(TRACE, "enter: bsscfgidx=%d\n", ifp->bsscfgidx);
++
++      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;
++}
++
+ #ifdef CONFIG_INET
+ #define ARPOL_MAX_ENTRIES     8
+ static int brcmf_inetaddr_changed(struct notifier_block *nb,
+@@ -927,6 +945,10 @@ int brcmf_attach(struct device *dev, str
+               goto fail;
+       }
++      /* Attach to events important for core code */
++      brcmf_fweh_register(drvr, BRCMF_E_PSM_WATCHDOG,
++                          brcmf_psm_watchdog_notify);
++
+       /* attach firmware event handler */
+       brcmf_fweh_attach(drvr);
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
+@@ -27,8 +27,8 @@
+ static struct dentry *root_folder;
+-static int brcmf_debug_create_memdump(struct brcmf_bus *bus, const void *data,
+-                                    size_t len)
++int brcmf_debug_create_memdump(struct brcmf_bus *bus, const void *data,
++                             size_t len)
+ {
+       void *dump;
+       size_t ramsize;
+@@ -54,24 +54,6 @@ static int brcmf_debug_create_memdump(st
+       return 0;
+ }
+-static int brcmf_debug_psm_watchdog_notify(struct brcmf_if *ifp,
+-                                         const struct brcmf_event_msg *evtmsg,
+-                                         void *data)
+-{
+-      int err;
+-
+-      brcmf_dbg(TRACE, "enter: bsscfgidx=%d\n", ifp->bsscfgidx);
+-
+-      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)
+ {
+       root_folder = debugfs_create_dir(KBUILD_MODNAME, NULL);
+@@ -99,9 +81,7 @@ int brcmf_debug_attach(struct brcmf_pub
+       if (IS_ERR(drvr->dbgfs_dir))
+               return PTR_ERR(drvr->dbgfs_dir);
+-
+-      return brcmf_fweh_register(drvr, BRCMF_E_PSM_WATCHDOG,
+-                                 brcmf_debug_psm_watchdog_notify);
++      return 0;
+ }
+ void brcmf_debug_detach(struct brcmf_pub *drvr)
+--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
+@@ -99,6 +99,7 @@ do {                                                                 \
+ extern int brcmf_msg_level;
++struct brcmf_bus;
+ struct brcmf_pub;
+ #ifdef DEBUG
+ void brcmf_debugfs_init(void);
+@@ -108,6 +109,8 @@ void brcmf_debug_detach(struct brcmf_pub
+ struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr);
+ int brcmf_debugfs_add_entry(struct brcmf_pub *drvr, const char *fn,
+                           int (*read_fn)(struct seq_file *seq, void *data));
++int brcmf_debug_create_memdump(struct brcmf_bus *bus, const void *data,
++                             size_t len);
+ #else
+ static inline void brcmf_debugfs_init(void)
+ {
+@@ -128,6 +131,12 @@ int brcmf_debugfs_add_entry(struct brcmf
+ {
+       return 0;
+ }
++static inline
++int brcmf_debug_create_memdump(struct brcmf_bus *bus, const void *data,
++                             size_t len)
++{
++      return 0;
++}
+ #endif
+ #endif /* BRCMFMAC_DEBUG_H */
index d09057f..51de76e 100644 (file)
@@ -13,7 +13,7 @@ Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
 
 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
-@@ -1196,6 +1196,7 @@ int __init brcmf_core_init(void)
+@@ -1218,6 +1218,7 @@ int __init brcmf_core_init(void)
  {
        if (!schedule_work(&brcmf_driver_work))
                return -EBUSY;