From 4165cf7ba52a381c95d1cce0d42a48aac2c96ea3 Mon Sep 17 00:00:00 2001
From: Rob Clark <robdclark@gmail.com>
Date: Mon, 3 Jul 2017 09:38:45 -0400
Subject: [PATCH] wcn36xx: check dma_mapping_error()
Git-commit: 4165cf7ba52a381c95d1cce0d42a48aac2c96ea3
Patch-mainline: v4.14-rc1
References: FATE#326906
Fixes splat:
wcn36xx a204000.wcnss:smd-edge:wcnss:wifi: DMA-API: device driver failed to check map error[device address=0x00000000b45ba000] [size=3872 bytes] [mapped as single]
------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at ../lib/dma-debug.c:1167 check_unmap+0x474/0x8d0
Modules linked in: bnep(E) arc4(E) wcn36xx(E) mac80211(E) btqcomsmd(E) btqca(E) bluetooth(E) cfg80211(E) ecdh_generic(E) rfkill(E) vfat(E) fat(E) wcnss_ctrl qcom_wcnss_pil(E) mdt_loader(E) qcom_common(E) remoteproc(E) crc32_ce(E) virtio_ring(E) snd_soc_lpass_apq8016(E) snd_soc_lpass_cpu(E) virtio(E) snd_soc_lpass_platform(E) leds_gpio(E) snd_soc_hdmi_codec(E) snd_soc_apq8016_sbc(E) snd_soc_msm8916_digital(E) snd_soc_core(E) qcom_spmi_temp_alarm(E) ac97_bus(E) snd_pcm_dmaengine(E) snd_seq(E) snd_seq_device(E) snd_pcm(E) spi_qup(E) nvmem_qfprom(E) snd_timer(E) snd(E) soundcore(E) msm_rng(E) qcom_tsens(E) nvmem_core(E) uas(E) usb_storage(E) dm9601(E) cdc_ether(E) usbnet(E) mii(E) mmc_block(E) sdhci_msm(E) sdhci_pltfm(E) qcom_spmi_vadc(E) qcom_vadc_common(PE) clk_smd_rpm(E) industrialio(E)
qcom_smd_regulator(E) pinctrl_spmi_mpp(E) pinctrl_spmi_gpio(E) rtc_pm8xxx(E) adv7511(E) smd_rpm(E) qcom_spmi_pmic(E) regmap_spmi(E) phy_msm_usb(E) usb3503(E) extcon_usb_gpio(E) ci_hdrc_msm(E) ci_hdrc(E) qcom_hwspinlock(E) udc_core(E) extcon_core(E) ehci_msm(E) i2c_qup(E) sdhci(E) msm(E) mmc_core(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_sys_fops(E) spmi_pmic_arb(E) drm(E) spmi(E) qcom_smd(E) rpmsg_core smsm(E) gpio_keys(E) smp2p(E) smem(E) hwspinlock_core(E) sunrpc(E) scsi_transport_iscsi(E)
CPU: 0 PID: 0 Comm: swapper/0 Tainted: P E 4.12.0-rc7+ #1476
Hardware name: qualcomm dragonboard410c/dragonboard410c, BIOS 2017.07-rc1-00234-g22fa70a-dirty 06/26/2017
task: ffff000009049780 task.stack: ffff000009030000
PC is at check_unmap+0x474/0x8d0
LR is at check_unmap+0x474/0x8d0
...
Mapped at:
dma_entry_alloc+0x68/0xa8
debug_dma_map_page+0x94/0x148
wcn36xx_dxe_fill_skb.isra.1+0xbc/0xf8 [wcn36xx]
wcn36xx_dxe_init+0x244/0x398 [wcn36xx]
wcn36xx_start+0xf4/0x298 [wcn36xx]
Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/wireless/ath/wcn36xx/dxe.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.c b/drivers/net/wireless/ath/wcn36xx/dxe.c
index 87dfdaf9044c..d5c810a8cc52 100644
--- a/drivers/net/wireless/ath/wcn36xx/dxe.c
+++ b/drivers/net/wireless/ath/wcn36xx/dxe.c
@@ -289,6 +289,11 @@ static int wcn36xx_dxe_fill_skb(struct device *dev, struct wcn36xx_dxe_ctl *ctl)
skb_tail_pointer(skb),
WCN36XX_PKT_SIZE,
DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, dxe->dst_addr_l)) {
+ dev_err(dev, "unable to map skb\n");
+ kfree_skb(skb);
+ return -ENOMEM;
+ }
ctl->skb = skb;
return 0;
--
2.19.2