Messages in this thread Patch in this message |  | | From | "Jon Burgess" <> | Date | Fri, 17 Nov 2000 15:10:53 +0000 | Subject | [Patch] oops with cs5530 using ide.2.2.17.all.20000904.patch (probably 2.4 as well) |
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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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