When using Linux-2.2.17 + ide.2.2.17.all.20000904.patch on a board with the
CS5530, doing the following generates a kernel NULL dereference:
pb-3com# cat /proc/ide/cs5530
Unable to handle kernel NULL pointer dereference at virtual address 0000003c
...
This is caused because the 'bmide_dev' in cs5530.c is NULL. This has been set
wrongly because the 'dev' value used in pci_init_cs5530() is corrupted by the
loop:
for( dev = pci_devices; dev; dev=dev->next)
{...}
A fix is to move the setting of the 'bmide_dev' value to before this loop.
A quick look at Linux-2.4.0-test9 shows it probably suffers from the same
problem as well.
Below is a patch against Linux-2.2.17 + ide.2.2.17.all.20000904.patch
--- cs5530.c Fri Nov 17 10:17:15 2000
+++ cs5530.c Fri Nov 17 14:45:06 2000
@@ -268,6 +268,14 @@
unsigned short pcicmd = 0;
unsigned long flags;
+#if defined(DISPLAY_CS5530_TIMINGS) && defined(CONFIG_PROC_FS)
+ if (!cs5530_proc) {
+ cs5530_proc = 1;
+ bmide_dev = dev;
+ cs5530_display_info = &cs5530_get_info;
+ }
+#endif /* DISPLAY_CS5530_TIMINGS && CONFIG_PROC_FS */
+
for(dev = pci_devices; dev; dev=dev->next) {
if (dev->vendor == PCI_VENDOR_ID_CYRIX) {
switch (dev->device) {
@@ -337,14 +345,6 @@
pci_write_config_byte(master_0, 0x43, 0xc1);
restore_flags(flags);
-
-#if defined(DISPLAY_CS5530_TIMINGS) && defined(CONFIG_PROC_FS)
- if (!cs5530_proc) {
- cs5530_proc = 1;
- bmide_dev = dev;
- cs5530_display_info = &cs5530_get_info;
- }
-#endif /* DISPLAY_CS5530_TIMINGS && CONFIG_PROC_FS */
return 0;
}
Jon
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