[TRIVIAL 2.2] tulip.c: gracefully handle init_ertherdev failure

From: Neale Banks (neale@lowendale.com.au)
Date: Sun Dec 29 2002 - 08:15:51 EST


Alan,

Appended patch to tulip.c (against 2.2.24-rc1) gracefully handles the case
where init_etherdev() fails. In the modular case, this would otherwise
lead to an oops at module load time and the tulip module listed as wedged
half-loaded.

This patch has, so far, only been tested as far as compiling. IMVHO
this patch is "TRIVIAL" and its correctness appears "obvious" - so will
verification that it still loads and operates happily be sufficient
testing?

FWIW, 2.4 already handles this case gracefully.

Thanks,
Neale.

--- linux-2.2.24-rc1/drivers/net/tulip.c Sat Nov 3 03:39:07 2001
+++ linux-2.2.24-rc1-ntb0/drivers/net/tulip.c Sat Dec 21 18:59:35 2002
@@ -23,6 +23,9 @@
         Updated 12/17/2000 by Jim McQuillan <jam@McQuil.com> to
         include support for the Linksys LNE100TX card based on the
         Admtek 985 Centaur-P chipset.
+
+ 2002 Dec 21 Neale Banks <neale@lowendale.com.au>
+ Gracefully handle the case where init_etherdev() returns NULL
 */
 
 #define SMP_CHECK
@@ -694,6 +697,11 @@
                 printk(KERN_INFO "%s", version);
 
         dev = init_etherdev(dev, 0);
+
+ if (dev == NULL) {
+ printk(KERN_ERR "tulip: Unable to allocate net_device structure!\n");
+ return NULL;
+ }
 
         /* Make certain the data structures are quadword aligned. */
         tp = (void *)(((long)kmalloc(sizeof(*tp), GFP_KERNEL | GFP_DMA) + 7) & ~7);

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