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Subject[PATCH v3 5/8] ath10k: use new taint_firmware_crashed()
Date
This makes use of the new taint_firmware_crashed() to help
annotate when firmware for device drivers crash. When firmware
crashes devices can sometimes become unresponsive, and recovery
sometimes requires a driver unload / reload and in the worst cases
a reboot.

Using a taint flag allows us to annotate when this happens clearly.

I have run into this situation with this driver with the latest
firmware as of today, May 21, 2020 using v5.6.0, leaving me at
a state at which my only option is to reboot. Driver removal and
addition does not fix the situation. This is reported on kernel.org
bugzilla korg#207851 [0]. But this isn't the first firmware crash reported,
others have been filed before and none of these bugs have yet been
addressed [1] [2] [3]. Including my own I see these firmware crash
reports:

* korg#207851 [0]
* korg#197013 [1]
* korg#201237 [2]
* korg#195987 [3]

[0] https://bugzilla.kernel.org/show_bug.cgi?id=207851
[1] https://bugzilla.kernel.org/show_bug.cgi?id=197013
[2] https://bugzilla.kernel.org/show_bug.cgi?id=201237
[3] https://bugzilla.kernel.org/show_bug.cgi?id=195987

Cc: linux-wireless@vger.kernel.org
Cc: ath10k@lists.infradead.org
Cc: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Rafael Aquini <aquini@redhat.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
drivers/net/wireless/ath/ath10k/pci.c | 2 ++
drivers/net/wireless/ath/ath10k/sdio.c | 2 ++
drivers/net/wireless/ath/ath10k/snoc.c | 1 +
3 files changed, 5 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index 1d941d53fdc9..818c3acc2468 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -1767,6 +1767,7 @@ static void ath10k_pci_fw_dump_work(struct work_struct *work)
scnprintf(guid, sizeof(guid), "n/a");

ath10k_err(ar, "firmware crashed! (guid %s)\n", guid);
+ taint_firmware_crashed();
ath10k_print_driver_info(ar);
ath10k_pci_dump_registers(ar, crash_data);
ath10k_ce_dump_registers(ar, crash_data);
@@ -2837,6 +2838,7 @@ static int ath10k_pci_hif_power_up(struct ath10k *ar,
if (ret) {
if (ath10k_pci_has_fw_crashed(ar)) {
ath10k_warn(ar, "firmware crashed during chip reset\n");
+ taint_firmware_crashed();
ath10k_pci_fw_crashed_clear(ar);
ath10k_pci_fw_crashed_dump(ar);
}
diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
index e2aff2254a40..8b2fc0b89be4 100644
--- a/drivers/net/wireless/ath/ath10k/sdio.c
+++ b/drivers/net/wireless/ath/ath10k/sdio.c
@@ -794,6 +794,7 @@ static int ath10k_sdio_mbox_proc_dbg_intr(struct ath10k *ar)

/* TODO: Add firmware crash handling */
ath10k_warn(ar, "firmware crashed\n");
+ taint_firmware_crashed();

/* read counter to clear the interrupt, the debug error interrupt is
* counter 0.
@@ -915,6 +916,7 @@ static int ath10k_sdio_mbox_proc_cpu_intr(struct ath10k *ar)
if (cpu_int_status & MBOX_CPU_STATUS_ENABLE_ASSERT_MASK) {
ath10k_err(ar, "firmware crashed!\n");
queue_work(ar->workqueue, &ar->restart_work);
+ taint_firmware_crashed();
}
return ret;
}
diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
index 354d49b1cd45..071ee7607a4c 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.c
+++ b/drivers/net/wireless/ath/ath10k/snoc.c
@@ -1451,6 +1451,7 @@ void ath10k_snoc_fw_crashed_dump(struct ath10k *ar)
scnprintf(guid, sizeof(guid), "n/a");

ath10k_err(ar, "firmware crashed! (guid %s)\n", guid);
+ taint_firmware_crashed();
ath10k_print_driver_info(ar);
ath10k_msa_dump_memory(ar, crash_data);
mutex_unlock(&ar->dump_mutex);
--
2.26.2
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