evie/android_kernel_oneplus_msm8998
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Merge "msm: ipa: Fix race condition head_desc_list variable access"

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Linux Build Service Account 2018-06-14 16:06:53 -07:00 • committed by Gerrit - the friendly Code Review server
commit a0e118cf53
1 changed files with 17 additions and 1 deletions
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18
drivers/platform/msm/ipa/ipa_v2/ipa_dp.c
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@ -1,4 +1,4 @@
/* Copyright (c) 2012-2017, The Linux Foundation. All rights reserved.
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -2115,8 +2115,10 @@ static void ipa_replenish_rx_cache(struct ipa_sys_context *sys)
goto fail_dma_mapping;
}
spin_lock_bh(&sys->spinlock);
list_add_tail(&rx_pkt->link, &sys->head_desc_list);
rx_len_cached = ++sys->len;
spin_unlock_bh(&sys->spinlock);
ret = sps_transfer_one(sys->ep->ep_hdl,
rx_pkt->data.dma_addr, sys->rx_buff_sz, rx_pkt, 0);
@ -2130,8 +2132,10 @@ static void ipa_replenish_rx_cache(struct ipa_sys_context *sys)
return;
fail_sps_transfer:
spin_lock_bh(&sys->spinlock);
list_del(&rx_pkt->link);
rx_len_cached = --sys->len;
spin_unlock_bh(&sys->spinlock);
dma_unmap_single(ipa_ctx->pdev, rx_pkt->data.dma_addr,
sys->rx_buff_sz, DMA_FROM_DEVICE);
fail_dma_mapping:
@ -2171,8 +2175,10 @@ static void ipa_replenish_rx_cache_recycle(struct ipa_sys_context *sys)
goto fail_dma_mapping;
}
spin_lock_bh(&sys->spinlock);
list_add_tail(&rx_pkt->link, &sys->head_desc_list);
rx_len_cached = ++sys->len;
spin_unlock_bh(&sys->spinlock);
ret = sps_transfer_one(sys->ep->ep_hdl,
rx_pkt->data.dma_addr, sys->rx_buff_sz, rx_pkt, 0);
@ -2185,9 +2191,11 @@ static void ipa_replenish_rx_cache_recycle(struct ipa_sys_context *sys)
return;
fail_sps_transfer:
spin_lock_bh(&sys->spinlock);
rx_len_cached = --sys->len;
list_del(&rx_pkt->link);
INIT_LIST_HEAD(&rx_pkt->link);
spin_unlock_bh(&sys->spinlock);
dma_unmap_single(ipa_ctx->pdev, rx_pkt->data.dma_addr,
sys->rx_buff_sz, DMA_FROM_DEVICE);
fail_dma_mapping:
@ -2219,7 +2227,9 @@ static void ipa_fast_replenish_rx_cache(struct ipa_sys_context *sys)
}
rx_pkt = sys->repl.cache[curr];
spin_lock_bh(&sys->spinlock);
list_add_tail(&rx_pkt->link, &sys->head_desc_list);
spin_unlock_bh(&sys->spinlock);
ret = sps_transfer_one(sys->ep->ep_hdl,
rx_pkt->data.dma_addr, sys->rx_buff_sz, rx_pkt, 0);
@ -2278,6 +2288,7 @@ static void ipa_cleanup_rx(struct ipa_sys_context *sys)
u32 head;
u32 tail;
spin_lock_bh(&sys->spinlock);
list_for_each_entry_safe(rx_pkt, r,
&sys->head_desc_list, link) {
list_del(&rx_pkt->link);
@ -2295,6 +2306,7 @@ static void ipa_cleanup_rx(struct ipa_sys_context *sys)
sys->free_skb(rx_pkt->data.skb);
kmem_cache_free(ipa_ctx->rx_pkt_wrapper_cache, rx_pkt);
}
spin_unlock_bh(&sys->spinlock);
if (sys->repl.cache) {
head = atomic_read(&sys->repl.head_idx);
@ -2970,6 +2982,7 @@ static void ipa_wq_rx_common(struct ipa_sys_context *sys, u32 size)
struct ipa_rx_pkt_wrapper *rx_pkt_expected;
struct sk_buff *rx_skb;
spin_lock_bh(&sys->spinlock);
if (unlikely(list_empty(&sys->head_desc_list))) {
WARN_ON(1);
return;
@ -2979,6 +2992,7 @@ static void ipa_wq_rx_common(struct ipa_sys_context *sys, u32 size)
link);
list_del(&rx_pkt_expected->link);
sys->len--;
spin_unlock_bh(&sys->spinlock);
if (size)
rx_pkt_expected->len = size;
rx_skb = rx_pkt_expected->data.skb;
@ -2999,6 +3013,7 @@ static void ipa_wlan_wq_rx_common(struct ipa_sys_context *sys, u32 size)
struct ipa_rx_pkt_wrapper *rx_pkt_expected;
struct sk_buff *rx_skb;
spin_lock_bh(&sys->spinlock);
if (unlikely(list_empty(&sys->head_desc_list))) {
WARN_ON(1);
return;
@ -3008,6 +3023,7 @@ static void ipa_wlan_wq_rx_common(struct ipa_sys_context *sys, u32 size)
link);
list_del(&rx_pkt_expected->link);
sys->len--;
spin_unlock_bh(&sys->spinlock);
if (size)
rx_pkt_expected->len = size;