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-rw-r--r--drivers/char/ipmi/ipmi_si_intf.c38
1 files changed, 22 insertions, 16 deletions
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index b36eef0e9d1..02a7dd7a8a5 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -1184,20 +1184,20 @@ static void port_outl(struct si_sm_io *io, unsigned int offset,
static void port_cleanup(struct smi_info *info)
{
unsigned int addr = info->io.addr_data;
- int mapsize;
+ int idx;
if (addr) {
- mapsize = ((info->io_size * info->io.regspacing)
- - (info->io.regspacing - info->io.regsize));
-
- release_region (addr, mapsize);
+ for (idx = 0; idx < info->io_size; idx++) {
+ release_region(addr + idx * info->io.regspacing,
+ info->io.regsize);
+ }
}
}
static int port_setup(struct smi_info *info)
{
unsigned int addr = info->io.addr_data;
- int mapsize;
+ int idx;
if (!addr)
return -ENODEV;
@@ -1225,16 +1225,22 @@ static int port_setup(struct smi_info *info)
return -EINVAL;
}
- /* Calculate the total amount of memory to claim. This is an
- * unusual looking calculation, but it avoids claiming any
- * more memory than it has to. It will claim everything
- * between the first address to the end of the last full
- * register. */
- mapsize = ((info->io_size * info->io.regspacing)
- - (info->io.regspacing - info->io.regsize));
-
- if (request_region(addr, mapsize, DEVICE_NAME) == NULL)
- return -EIO;
+ /* Some BIOSes reserve disjoint I/O regions in their ACPI
+ * tables. This causes problems when trying to register the
+ * entire I/O region. Therefore we must register each I/O
+ * port separately.
+ */
+ for (idx = 0; idx < info->io_size; idx++) {
+ if (request_region(addr + idx * info->io.regspacing,
+ info->io.regsize, DEVICE_NAME) == NULL) {
+ /* Undo allocations */
+ while (idx--) {
+ release_region(addr + idx * info->io.regspacing,
+ info->io.regsize);
+ }
+ return -EIO;
+ }
+ }
return 0;
}