This is a note to let you know that I've just added the patch titled
cxl: Add timeout to process element commands
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cxl-add-timeout-to-process-element-commands.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a98e6e9f4e0224d85b4d951edc44af16dfe6094a Mon Sep 17 00:00:00 2001
From: Ian Munsie <[email protected]>
Date: Mon, 8 Dec 2014 19:17:56 +1100
Subject: cxl: Add timeout to process element commands
From: Ian Munsie <[email protected]>
commit a98e6e9f4e0224d85b4d951edc44af16dfe6094a upstream.
In the event that something goes wrong in the hardware and it is unable
to complete a process element comment we would end up polling forever,
effectively making the associated process unkillable.
This patch adds a timeout to the process element command code path, so
that we will give up if the hardware does not respond in a reasonable
time.
Signed-off-by: Ian Munsie <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/misc/cxl/native.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/misc/cxl/native.c
+++ b/drivers/misc/cxl/native.c
@@ -277,6 +277,7 @@ static int do_process_element_cmd(struct
u64 cmd, u64 pe_state)
{
u64 state;
+ unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
WARN_ON(!ctx->afu->enabled);
@@ -286,6 +287,10 @@ static int do_process_element_cmd(struct
smp_mb();
cxl_p1n_write(ctx->afu, CXL_PSL_LLCMD_An, cmd | ctx->pe);
while (1) {
+ if (time_after_eq(jiffies, timeout)) {
+ dev_warn(&ctx->afu->dev, "WARNING: Process Element
Command timed out!\n");
+ return -EBUSY;
+ }
state = be64_to_cpup(ctx->afu->sw_command_status);
if (state == ~0ULL) {
pr_err("cxl: Error adding process element to AFU\n");
Patches currently in stable-queue which might be from [email protected] are
queue-3.18/cxl-change-contexts_lock-to-a-mutex-to-fix-sleep-while-atomic-bug.patch
queue-3.18/cxl-add-timeout-to-process-element-commands.patch
queue-3.18/cxl-unmap-mmio-regions-when-detaching-a-context.patch
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