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authorChandru <chandru@in.ibm.com>2010-01-11 09:19:21 +0300
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-02-23 03:16:58 +0300
commitb0fc889c4311835ae7d02f433154bc20cad9ee11 (patch)
tree8985c7acc157bb7e40d271e136b5cdc7dd56d225 /drivers/pci/hotplug/ibmphp_ebda.c
parent6fcaf17ac7a512227112ac81c0e1a5862bab57a6 (diff)
downloadlinux-b0fc889c4311835ae7d02f433154bc20cad9ee11.tar.xz
PCI hotplug: ibmphp: read the length of ebda and map entire ebda region
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>
Diffstat (limited to 'drivers/pci/hotplug/ibmphp_ebda.c')
-rw-r--r--drivers/pci/hotplug/ibmphp_ebda.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/pci/hotplug/ibmphp_ebda.c b/drivers/pci/hotplug/ibmphp_ebda.c
index c1abac8ab5c3..7d3bf31d224d 100644
--- a/drivers/pci/hotplug/ibmphp_ebda.c
+++ b/drivers/pci/hotplug/ibmphp_ebda.c
@@ -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;