---------- Forwarded message ----------
Date: Wed, 20 Feb 2008 20:11:01 +0000
From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
To: akpm@xxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
Subject: [PATCH] amiserial: Prepare for locking relaxation in caller.
Just wrap this one in a lock_kernel. As I understand it there is no M68K
SMP anyway.
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-rc2-mm1/drivers/char/amiserial.c linux-2.6.25-rc2-mm1/drivers/char/amiserial.c
--- linux.vanilla-2.6.25-rc2-mm1/drivers/char/amiserial.c 2008-02-19 11:01:44.000000000 +0000
+++ linux-2.6.25-rc2-mm1/drivers/char/amiserial.c 2008-02-20 11:45:28.000000000 +0000
@@ -1074,6 +1074,7 @@
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
+ lock_kernel();
tmp.type = state->type;
tmp.line = state->line;
tmp.port = state->port;
@@ -1084,6 +1085,7 @@
tmp.close_delay = state->close_delay;
tmp.closing_wait = state->closing_wait;
tmp.custom_divisor = state->custom_divisor;
+ unlock_kernel();
if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
return -EFAULT;
return 0;
@@ -1099,13 +1101,17 @@
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
return -EFAULT;
+
+ lock_kernel();
state = info->state;
old_state = *state;
change_irq = new_serial.irq != state->irq;
change_port = (new_serial.port != state->port);
- if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
+ if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
+ unlock_kernel();
return -EINVAL;
+ }
if (!serial_isroot()) {
if ((new_serial.baud_base != state->baud_base) ||
@@ -1122,8 +1128,10 @@
goto check_and_exit;
}
- if (new_serial.baud_base < 9600)
+ if (new_serial.baud_base < 9600) {
+ unlock_kernel();
return -EINVAL;
+ }
/*
* OK, past this point, all the error checking has been done.
@@ -1157,6 +1165,7 @@
}
} else
retval = startup(info);
+ unlock_kernel();
return retval;
}
--
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