[svn-commits] tzafrir: linux/trunk r9709 - /linux/trunk/drivers/dahdi/xpp/init_card_4_30

[SVN commits to the Digium repositories]

Author: tzafrir
Date: Sun Jan 30 12:10:33 2011
New Revision: 9709

URL: http://svnview.digium.com/svn/dahdi?view=rev&rev=9709
Log:
xpp: init_card_4_30: add comment

Signed-off-by: Tzafrir Cohen <tzafrir.cohen at xorcom.com>

Modified:
    linux/trunk/drivers/dahdi/xpp/init_card_4_30

Modified: linux/trunk/drivers/dahdi/xpp/init_card_4_30
URL: http://svnview.digium.com/svn/dahdi/linux/trunk/drivers/dahdi/xpp/init_card_4_30?view=diff&rev=9709&r1=9708&r2=9709
==============================================================================
--- linux/trunk/drivers/dahdi/xpp/init_card_4_30 (original)
+++ linux/trunk/drivers/dahdi/xpp/init_card_4_30 Sun Jan 30 12:10:33 2011
@@ -348,6 +348,11 @@
 	} else {
 		my $file = sprintf "/sys/bus/xpds/devices/%02d:%1d:%1d/pri_protocol",
 				$ENV{XBUS_NUMBER}, $ENV{UNIT_NUMBER}, $portno;
+		# The 'open' will fail if the port does not exist.
+		# (or rather: the XPD for it does not exist). While
+		# we only read this file to get the default E1/T1 value,
+		# if it does not exist, it also implies the commands sent would
+		# get nowhere. So we might as well quit now.
 		open(F, $file) || return;
 		$sysfs_pri_protocol = <F>;
 		close F;