The patch titled
Subject: netconsole: remove unnecessary netconsole_target_get/out() from write_msg()
has been added to the -mm tree. Its filename is
netconsole-remove-unnecessary-netconsole_target_get-out-from-write_msg.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/netconsole-remove-unnecessary-netconsole_target_get-out-from-write_msg.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/netconsole-remove-unnecessary-netconsole_target_get-out-from-write_msg.patch
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------------------------------------------------------
From: Tejun Heo <tj@xxxxxxxxxx>
Subject: netconsole: remove unnecessary netconsole_target_get/out() from write_msg()
write_msg() grabs target_list_lock and walks target_list invoking
netpool_send_udp() on each target. Curiously, it protects each iteration
with netconsole_target_get/put() even though it never releases
target_list_lock which protects all the members.
While this doesn't harm anything, it doesn't serve any purpose either.
The items on the list can't go away while target_list_lock is held.
Remove the unnecessary get/put pair.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Kay Sievers <kay@xxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/net/netconsole.c | 2 --
1 file changed, 2 deletions(-)
diff -puN drivers/net/netconsole.c~netconsole-remove-unnecessary-netconsole_target_get-out-from-write_msg drivers/net/netconsole.c
--- a/drivers/net/netconsole.c~netconsole-remove-unnecessary-netconsole_target_get-out-from-write_msg
+++ a/drivers/net/netconsole.c
@@ -744,7 +744,6 @@ static void write_msg(struct console *co
spin_lock_irqsave(&target_list_lock, flags);
list_for_each_entry(nt, &target_list, list) {
- netconsole_target_get(nt);
if (nt->enabled && netif_running(nt->np.dev)) {
/*
* We nest this inside the for-each-target loop above
@@ -760,7 +759,6 @@ static void write_msg(struct console *co
left -= frag;
}
}
- netconsole_target_put(nt);
}
spin_unlock_irqrestore(&target_list_lock, flags);
}
_
Patches currently in -mm which might be from tj@xxxxxxxxxx are
origin.patch
gfp-add-__gfp_noaccount.patch
gfp-add-__gfp_noaccount-v2.patch
gfp-add-__gfp_noaccount-v2-fix.patch
kernfs-do-not-account-ino_ida-allocations-to-memcg.patch
block-restore-proc-partitions-to-not-display-non-partitionable-removable-devices.patch
fs-mpagec-forgotten-write_sync-in-case-of-data-integrity-write.patch
printk-guard-the-amount-written-per-line-by-devkmsg_read.patch
printk-factor-out-message-formatting-from-devkmsg_read.patch
printk-implement-support-for-extended-console-drivers.patch
netconsole-remove-unnecessary-netconsole_target_get-out-from-write_msg.patch
netconsole-make-netconsole_target-enabled-a-bool.patch
netconsole-make-all-dynamic-netconsoles-share-a-mutex.patch
netconsole-implement-extended-console-support.patch
bitmap-remove-explicit-newline-handling-using-scnprintf-format-string.patch
bitmap-remove-explicit-newline-handling-using-scnprintf-format-string-fix.patch
ipc-msgc-msgsnd-use-freezable-blocking-call.patch
msgrcv-use-freezable-blocking-call.patch
linux-next.patch
printk-improve-the-description-of-dev-kmsg-line-format.patch
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