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PCI hotplug: ibmphp: read the length of ebda and map entire ebda region

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ibmphp driver currently maps only 1KB of ebda memory area into kernel address
space during driver initialization. This causes kernel oops when the driver is
modprobe'd and it accesses memory beyond 1KB within ebda segment. The first
byte of ebda segment actually stores the length of the ebda region in
Kilobytes. Hence make use of the length parameter and map the entire ebda
region.

Signed-off-by: Chandru Siddalingappa <chandru@linux.vnet.ibm.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Chandru 2010-01-11 11:49:21 +05:30 committed by Jesse Barnes
parent 6fcaf17ac7
commit b0fc889c43
1 changed files with 9 additions and 2 deletions
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11
drivers/pci/hotplug/ibmphp_ebda.c
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@ -245,7 +245,7 @@ static void __init print_ebda_hpc (void)
int __init ibmphp_access_ebda (void)
{
u8 format, num_ctlrs, rio_complete, hs_complete;
u8 format, num_ctlrs, rio_complete, hs_complete, ebda_sz;
u16 ebda_seg, num_entries, next_offset, offset, blk_id, sub_addr, re, rc_id, re_id, base;
int rc = 0;
@ -260,7 +260,14 @@ int __init ibmphp_access_ebda (void)
iounmap (io_mem);
debug ("returned ebda segment: %x\n", ebda_seg);
io_mem = ioremap(ebda_seg<<4, 1024);
io_mem = ioremap(ebda_seg<<4, 1);
ebda_sz = readb(io_mem);
iounmap(io_mem);
debug("ebda size: %d(KiB)\n", ebda_sz);
if (ebda_sz == 0)
return -ENOMEM;
io_mem = ioremap(ebda_seg<<4, (ebda_sz * 1024));
if (!io_mem )
return -ENOMEM;
next_offset = 0x180;