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| author | Rusty Russell <rusty@rustcorp.com.au> | 2010-08-11 23:04:27 -0600 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2010-08-11 23:04:31 +0930 |
| commit | d6d1b650ae6acce73d55dd0246de22180303ae73 (patch) | |
| tree | 7a342999c119a5ee6395966cee91ddf5186f5665 /net/mac80211/rate.c | |
| parent | dca41306395eab37e222ff9e72765e692fcc7251 (diff) | |
| download | lwn-d6d1b650ae6acce73d55dd0246de22180303ae73.tar.gz lwn-d6d1b650ae6acce73d55dd0246de22180303ae73.zip | |
param: simple locking for sysfs-writable charp parameters
Since the writing to sysfs can free the old one, we need to block that
when we access the charp variables.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Dan Williams <dcbw@redhat.com>
Cc: John W. Linville <linville@tuxdriver.com>
Cc: Jing Huang <huangj@brocade.com>
Cc: James E.J. Bottomley <James.Bottomley@suse.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: David S. Miller <davem@davemloft.net>
Cc: user-mode-linux-devel@lists.sourceforge.net
Cc: libertas-dev@lists.infradead.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Diffstat (limited to 'net/mac80211/rate.c')
| -rw-r--r-- | net/mac80211/rate.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c index 6d0bd198af19..be04d46110fe 100644 --- a/net/mac80211/rate.c +++ b/net/mac80211/rate.c @@ -103,6 +103,7 @@ ieee80211_rate_control_ops_get(const char *name) struct rate_control_ops *ops; const char *alg_name; + kparam_block_sysfs_write(ieee80211_default_rc_algo); if (!name) alg_name = ieee80211_default_rc_algo; else @@ -120,6 +121,7 @@ ieee80211_rate_control_ops_get(const char *name) /* try built-in one if specific alg requested but not found */ if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT)) ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); + kparam_unblock_sysfs_write(ieee80211_default_rc_algo); return ops; } |