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Subject[PATCH 5/5] ACPI, APEI, Fix ERST MOVE_DATA instruction implementation
Date
The src_base and dst_base fields in apei_exec_context are physical
address, so they should be ioremaped before being used in ERST
MOVE_DATA instruction.

Reported-by: Javier Martinez Canillas <martinez.javier@gmail.com>
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Huang Ying <ying.huang@intel.com>
---
drivers/acpi/apei/erst.c | 20 +++++++++++++++++---
1 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index 40b01c3..a103963 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -266,13 +266,27 @@ static int erst_exec_move_data(struct apei_exec_context *ctx,
{
int rc;
u64 offset;
+ void *src, *dst;
+
+ /* ioremap does not work in interrupt context */
+ if (in_interrupt())
+ return -EBUSY;

rc = __apei_exec_read_register(entry, &offset);
if (rc)
return rc;
- memmove((void *)ctx->dst_base + offset,
- (void *)ctx->src_base + offset,
- ctx->var2);
+
+ src = ioremap(ctx->src_base + offset, ctx->var2);
+ if (!src)
+ return -ENOMEM;
+ dst = ioremap(ctx->dst_base + offset, ctx->var2);
+ if (!dst)
+ return -ENOMEM;
+
+ memmove(dst, src, ctx->var2);
+
+ iounmap(src);
+ iounmap(dst);

return 0;
}
--
1.7.1


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