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55 lines
1.9 KiB
Diff
55 lines
1.9 KiB
Diff
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Mon, 18 Nov 2019 11:52:41 +0100
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Subject: [PATCH FIX] brcmfmac: disable PCIe interrupts before bus reset
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Keeping interrupts on could result in brcmfmac freeing some resources
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and then IRQ handlers trying to use them. That was obviously a straight
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path for crashing a kernel.
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Example:
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CPU0 CPU1
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---- ----
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brcmf_pcie_reset
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brcmf_pcie_bus_console_read
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brcmf_detach
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...
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brcmf_fweh_detach
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brcmf_proto_detach
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brcmf_pcie_isr_thread
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...
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brcmf_proto_msgbuf_rx_trigger
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...
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drvr->proto->pd
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brcmf_pcie_release_irq
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[ 363.789218] Unable to handle kernel NULL pointer dereference at virtual address 00000038
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[ 363.797339] pgd = c0004000
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[ 363.800050] [00000038] *pgd=00000000
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[ 363.803635] Internal error: Oops: 17 [#1] SMP ARM
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(...)
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[ 364.029209] Backtrace:
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[ 364.031725] [<bf243838>] (brcmf_proto_msgbuf_rx_trigger [brcmfmac]) from [<bf2471dc>] (brcmf_pcie_isr_thread+0x228/0x274 [brcmfmac])
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[ 364.043662] r7:00000001 r6:c8ca0000 r5:00010000 r4:c7b4f800
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Fixes: 4684997d9eea ("brcmfmac: reset PCIe bus on a firmware crash")
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Cc: stable@vger.kernel.org # v5.2+
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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---
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drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
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+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
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@@ -1427,6 +1427,8 @@ static int brcmf_pcie_reset(struct devic
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struct brcmf_fw_request *fwreq;
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int err;
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+ brcmf_pcie_intr_disable(devinfo);
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+
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brcmf_pcie_bus_console_read(devinfo, true);
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brcmf_detach(dev);
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