[PATCH 1/1] wifi: brcm80211: brcmfmac: Prevent sdio bus going to sleep while transfering data

[Nikolay Nikolov <dobrev666@xxxxxxxxx>]

Use mutex to prevent sdio bus to be put to sleep by the sdio_bus_watchdog
while sdio dataworker handles sdio_dpc data transfers.

Signed-off-by: Nikolay Nikolov <nikolay.nikolov@xxxxxxxxx>

 drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
index 6b38d9de71af..26d0bce6cedc 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -524,6 +524,7 @@ struct brcmf_sdio {
  bool txglom; /* host tx glomming enable flag */
  u16 head_align; /* buffer pointer alignment */
  u16 sgentry_align; /* scatter-gather buffer alignment */
+ struct mutex dpc_mutex;
 };

 /* clkstate */
@@ -3724,6 +3725,7 @@ static void brcmf_sdio_bus_watchdog(struct
brcmf_sdio *bus)
  }
 #endif /* DEBUG */

+ mutex_lock(&bus->dpc_mutex);
  /* On idle timeout clear activity flag and/or turn off clock */
  if (!bus->dpc_triggered) {
  rmb();
@@ -3748,6 +3750,7 @@ static void brcmf_sdio_bus_watchdog(struct
brcmf_sdio *bus)
  } else {
  bus->idlecount = 0;
  }
+ mutex_unlock(&bus->dpc_mutex);
 }

 static void brcmf_sdio_dataworker(struct work_struct *work)
@@ -3755,6 +3758,7 @@ static void brcmf_sdio_dataworker(struct
work_struct *work)
  struct brcmf_sdio *bus = container_of(work, struct brcmf_sdio,
       datawork);

+ mutex_lock(&bus->dpc_mutex);
  bus->dpc_running = true;
  wmb();
  while (READ_ONCE(bus->dpc_triggered)) {
@@ -3763,6 +3767,7 @@ static void brcmf_sdio_dataworker(struct
work_struct *work)
  bus->idlecount = 0;
  }
  bus->dpc_running = false;
+ mutex_unlock(&bus->dpc_mutex);
  if (brcmf_sdiod_freezing(bus->sdiodev)) {
  brcmf_sdiod_change_state(bus->sdiodev, BRCMF_SDIOD_DOWN);
  brcmf_sdiod_try_freeze(bus->sdiodev);
@@ -4525,6 +4530,7 @@ struct brcmf_sdio *brcmf_sdio_probe(struct
brcmf_sdio_dev *sdiodev)

  /* SR state */
  bus->sr_enabled = false;
+ mutex_init(&bus->dpc_mutex);

  brcmf_dbg(INFO, "completed!!\n");