diff options
| author | Lorenzo Bianconi <lorenzo@kernel.org> | 2022-12-01 18:26:53 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-12-03 08:23:02 +0300 |
| commit | 65e6af6cebefbf7d8d8ac52b71cd251c2071ad00 (patch) | |
| tree | c1cd7ea5d0f0e8d8ec93a4317af75526cd2acd16 | |
| parent | 55fb80d518c7323d05b71eda0c9f9d657b373816 (diff) | |
| download | linux-65e6af6cebefbf7d8d8ac52b71cd251c2071ad00.tar.xz | |
net: ethernet: mtk_wed: fix sleep while atomic in mtk_wed_wo_queue_refill
In order to fix the following sleep while atomic bug always alloc pages
with GFP_ATOMIC in mtk_wed_wo_queue_refill since page_frag_alloc runs in
spin_lock critical section.
[ 9.049719] Hardware name: MediaTek MT7986a RFB (DT)
[ 9.054665] Call trace:
[ 9.057096] dump_backtrace+0x0/0x154
[ 9.060751] show_stack+0x14/0x1c
[ 9.064052] dump_stack_lvl+0x64/0x7c
[ 9.067702] dump_stack+0x14/0x2c
[ 9.071001] ___might_sleep+0xec/0x120
[ 9.074736] __might_sleep+0x4c/0x9c
[ 9.078296] __alloc_pages+0x184/0x2e4
[ 9.082030] page_frag_alloc_align+0x98/0x1ac
[ 9.086369] mtk_wed_wo_queue_refill+0x134/0x234
[ 9.090974] mtk_wed_wo_init+0x174/0x2c0
[ 9.094881] mtk_wed_attach+0x7c8/0x7e0
[ 9.098701] mt7915_mmio_wed_init+0x1f0/0x3a0 [mt7915e]
[ 9.103940] mt7915_pci_probe+0xec/0x3bc [mt7915e]
[ 9.108727] pci_device_probe+0xac/0x13c
[ 9.112638] really_probe.part.0+0x98/0x2f4
[ 9.116807] __driver_probe_device+0x94/0x13c
[ 9.121147] driver_probe_device+0x40/0x114
[ 9.125314] __driver_attach+0x7c/0x180
[ 9.129133] bus_for_each_dev+0x5c/0x90
[ 9.132953] driver_attach+0x20/0x2c
[ 9.136513] bus_add_driver+0x104/0x1fc
[ 9.140333] driver_register+0x74/0x120
[ 9.144153] __pci_register_driver+0x40/0x50
[ 9.148407] mt7915_init+0x5c/0x1000 [mt7915e]
[ 9.152848] do_one_initcall+0x40/0x25c
[ 9.156669] do_init_module+0x44/0x230
[ 9.160403] load_module+0x1f30/0x2750
[ 9.164135] __do_sys_init_module+0x150/0x200
[ 9.168475] __arm64_sys_init_module+0x18/0x20
[ 9.172901] invoke_syscall.constprop.0+0x4c/0xe0
[ 9.177589] do_el0_svc+0x48/0xe0
[ 9.180889] el0_svc+0x14/0x50
[ 9.183929] el0t_64_sync_handler+0x9c/0x120
[ 9.188183] el0t_64_sync+0x158/0x15c
Fixes: 799684448e3e ("net: ethernet: mtk_wed: introduce wed wo support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Link: https://lore.kernel.org/r/67ca94bdd3d9eaeb86e52b3050fbca0bcf7bb02f.1669908312.git.lorenzo@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | drivers/net/ethernet/mediatek/mtk_wed_wo.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/net/ethernet/mediatek/mtk_wed_wo.c b/drivers/net/ethernet/mediatek/mtk_wed_wo.c index 4754b6db009e..a219da85f4db 100644 --- a/drivers/net/ethernet/mediatek/mtk_wed_wo.c +++ b/drivers/net/ethernet/mediatek/mtk_wed_wo.c @@ -133,17 +133,18 @@ mtk_wed_wo_dequeue(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q, u32 *len, static int mtk_wed_wo_queue_refill(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q, - gfp_t gfp, bool rx) + bool rx) { enum dma_data_direction dir = rx ? DMA_FROM_DEVICE : DMA_TO_DEVICE; int n_buf = 0; spin_lock_bh(&q->lock); while (q->queued < q->n_desc) { - void *buf = page_frag_alloc(&q->cache, q->buf_size, gfp); struct mtk_wed_wo_queue_entry *entry; dma_addr_t addr; + void *buf; + buf = page_frag_alloc(&q->cache, q->buf_size, GFP_ATOMIC); if (!buf) break; @@ -215,7 +216,7 @@ mtk_wed_wo_rx_run_queue(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) mtk_wed_mcu_rx_unsolicited_event(wo, skb); } - if (mtk_wed_wo_queue_refill(wo, q, GFP_ATOMIC, true)) { + if (mtk_wed_wo_queue_refill(wo, q, true)) { u32 index = (q->head - 1) % q->n_desc; mtk_wed_wo_queue_kick(wo, q, index); @@ -432,7 +433,7 @@ mtk_wed_wo_hardware_init(struct mtk_wed_wo *wo) if (ret) goto error; - mtk_wed_wo_queue_refill(wo, &wo->q_tx, GFP_KERNEL, false); + mtk_wed_wo_queue_refill(wo, &wo->q_tx, false); mtk_wed_wo_queue_reset(wo, &wo->q_tx); regs.desc_base = MTK_WED_WO_CCIF_DUMMY5; @@ -446,7 +447,7 @@ mtk_wed_wo_hardware_init(struct mtk_wed_wo *wo) if (ret) goto error; - mtk_wed_wo_queue_refill(wo, &wo->q_rx, GFP_KERNEL, true); + mtk_wed_wo_queue_refill(wo, &wo->q_rx, true); mtk_wed_wo_queue_reset(wo, &wo->q_rx); /* rx queue irqmask */ |