From 75a09b8d02084edf325f24c24a7c08338831b5a4 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Wed, 12 Jan 2022 07:30:10 -0600 Subject: [PATCH] net: ipa: fix atomic update in ipa_endpoint_replenish() commit 6c0e3b5ce94947b311348c367db9e11dcb2ccc93 upstream. In ipa_endpoint_replenish(), if an error occurs when attempting to replenish a receive buffer, we just quit and try again later. In that case we increment the backlog count to reflect that the attempt was unsuccessful. Then, if the add_one flag was true we increment the backlog again. This second increment is not included in the backlog local variable though, and its value determines whether delayed work should be scheduled. This is a bug. Fix this by determining whether 1 or 2 should be added to the backlog before adding it in a atomic_add_return() call. Reviewed-by: Matthias Kaehlcke Fixes: 84f9bd12d46db ("soc: qcom: ipa: IPA endpoints") Signed-off-by: Alex Elder Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ipa/ipa_endpoint.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c index 03a1709934208..c8f90cb1ee8f3 100644 --- a/drivers/net/ipa/ipa_endpoint.c +++ b/drivers/net/ipa/ipa_endpoint.c @@ -1067,6 +1067,7 @@ static void ipa_endpoint_replenish(struct ipa_endpoint *endpoint, bool add_one) { struct gsi *gsi; u32 backlog; + int delta; if (!endpoint->replenish_enabled) { if (add_one) @@ -1084,10 +1085,8 @@ static void ipa_endpoint_replenish(struct ipa_endpoint *endpoint, bool add_one) try_again_later: /* The last one didn't succeed, so fix the backlog */ - backlog = atomic_inc_return(&endpoint->replenish_backlog); - - if (add_one) - atomic_inc(&endpoint->replenish_backlog); + delta = add_one ? 2 : 1; + backlog = atomic_add_return(delta, &endpoint->replenish_backlog); /* Whenever a receive buffer transaction completes we'll try to * replenish again. It's unlikely, but if we fail to supply even -- 2.30.2