2.6.32-longterm review patch. If anyone has any objections, please let us know.
------------------ From: Paul Fox <[email protected]> commit 2ae1b8b35faba31a59b153cbad07f9c15de99740 upstream. We occasionally see list corruption using libertas. While we haven't been able to diagnose this precisely, we have spotted a possible cause: cmdpendingq is generally modified with driver_lock held. However, there are a couple of points where this is not the case. Fix up those operations to execute under the lock, it seems like the correct thing to do and will hopefully improve the situation. Signed-off-by: Paul Fox <[email protected]> Signed-off-by: Daniel Drake <[email protected]> Acked-by: Dan Williams <[email protected]> Signed-off-by: John W. Linville <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/net/wireless/libertas/cmd.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/net/wireless/libertas/cmd.c +++ b/drivers/net/wireless/libertas/cmd.c @@ -1758,8 +1758,8 @@ int lbs_execute_next_command(struct lbs_ cpu_to_le16(CMD_SUBCMD_EXIT_PS)) { lbs_deb_host( "EXEC_NEXT_CMD: ignore ENTER_PS cmd\n"); - list_del(&cmdnode->list); spin_lock_irqsave(&priv->driver_lock, flags); + list_del(&cmdnode->list); lbs_complete_command(priv, cmdnode, 0); spin_unlock_irqrestore(&priv->driver_lock, flags); @@ -1771,8 +1771,8 @@ int lbs_execute_next_command(struct lbs_ (priv->psstate == PS_STATE_PRE_SLEEP)) { lbs_deb_host( "EXEC_NEXT_CMD: ignore EXIT_PS cmd in sleep\n"); - list_del(&cmdnode->list); spin_lock_irqsave(&priv->driver_lock, flags); + list_del(&cmdnode->list); lbs_complete_command(priv, cmdnode, 0); spin_unlock_irqrestore(&priv->driver_lock, flags); priv->needtowakeup = 1; @@ -1785,7 +1785,9 @@ int lbs_execute_next_command(struct lbs_ "EXEC_NEXT_CMD: sending EXIT_PS\n"); } } + spin_lock_irqsave(&priv->driver_lock, flags); list_del(&cmdnode->list); + spin_unlock_irqrestore(&priv->driver_lock, flags); lbs_deb_host("EXEC_NEXT_CMD: sending command 0x%04x\n", le16_to_cpu(cmd->command)); lbs_submit_command(priv, cmdnode); _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
