Commit 2e4955167ec5 ("firmware: qcom: scm: Fix __scm and waitq
completion variable initialization") introduced a write barrier in probe
function to store global '__scm' variable. It also claimed that it
added a read barrier, because as we all known barriers are paired (see
memory-barriers.txt: "Note that write barriers should normally be paired
with read or address-dependency barriers"), however it did not really
add it.
The offending commit used READ_ONCE() to access '__scm' global which is
not a barrier.
The barrier is needed so the store to '__scm' will be properly visible.
This is most likely not fatal in current driver design, because missing
read barrier would mean qcom_scm_is_available() callers will access old
value, NULL. Driver does not support unbinding and does not correctly
handle probe failures, thus there is no risk of stale or old pointer in
'__scm' variable.
However for code correctness, readability and to be sure that we did not
mess up something in this tricky topic of SMP barriers, add a read
barrier for accessing '__scm'. Change also comment from useless/obvious
what does barrier do, to what is expected: which other parts of the code
are involved here.
Fixes: 2e4955167ec5 ("firmware: qcom: scm: Fix __scm and waitq completion variable initialization")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
---
drivers/firmware/qcom/qcom_scm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 72bf87ddcd969834609cda2aa915b67505e93943..246d672e8f7f0e2a326a03a5af40cd434a665e67 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -1867,7 +1867,8 @@ static int qcom_scm_qseecom_init(struct qcom_scm *scm)
*/
bool qcom_scm_is_available(void)
{
- return !!READ_ONCE(__scm);
+ /* Paired with smp_store_release() in qcom_scm_probe */
+ return !!smp_load_acquire(&__scm);
}
EXPORT_SYMBOL_GPL(qcom_scm_is_available);
@@ -2024,7 +2025,7 @@ static int qcom_scm_probe(struct platform_device *pdev)
if (ret)
return ret;
- /* Let all above stores be available after this */
+ /* Paired with smp_load_acquire() in qcom_scm_is_available(). */
smp_store_release(&__scm, scm);
irq = platform_get_irq_optional(pdev, 0);
--
2.43.0
