[PATCH] mmc: meson-gx: Convert host->lock to raw spinlock

[Sean Anderson]

The primary handler for IRQF_ONESHOT interrupts is always run without
threading, even on PREEMPT_RT. Therefore, we must use a raw spinlock,
which will never sleep (even on PREEMPT_RT).

Fixes: 066ecde6d826 ("mmc: meson-gx: add SDIO interrupt support")
Signed-off-by: Sean Anderson <sanderson at brivo.com>
---

 drivers/mmc/host/meson-gx-mmc.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 694bb443d5f3f..d5365c0404cb9 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -176,7 +176,7 @@ struct meson_host {
 
 	bool needs_pre_post_req;
 
-	spinlock_t lock;
+	raw_spinlock_t lock;
 };
 
 #define CMD_CFG_LENGTH_MASK GENMASK(8, 0)
@@ -953,10 +953,10 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 	cmd = host->cmd;
 
 	if (status & IRQ_SDIO) {
-		spin_lock(&host->lock);
+		raw_spin_lock(&host->lock);
 		__meson_mmc_enable_sdio_irq(host->mmc, 0);
 		sdio_signal_irq(host->mmc);
-		spin_unlock(&host->lock);
+		raw_spin_unlock(&host->lock);
 		status &= ~IRQ_SDIO;
 		if (!status)
 			return IRQ_HANDLED;
@@ -1112,9 +1112,9 @@ static void meson_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
 	struct meson_host *host = mmc_priv(mmc);
 	unsigned long flags;
 
-	spin_lock_irqsave(&host->lock, flags);
+	raw_spin_lock_irqsave(&host->lock, flags);
 	__meson_mmc_enable_sdio_irq(mmc, enable);
-	spin_unlock_irqrestore(&host->lock, flags);
+	raw_spin_unlock_irqrestore(&host->lock, flags);
 }
 
 static void meson_mmc_ack_sdio_irq(struct mmc_host *mmc)
@@ -1225,7 +1225,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_init_clk;
 
-	spin_lock_init(&host->lock);
+	raw_spin_lock_init(&host->lock);
 
 	if (host->dram_access_quirk) {
 		/* Limit segments to 1 due to low available sram memory */
---
base-commit: 587858367581b9c55c3690f4e63382ad622719d4
branch: meson_mmc_raw

-- 
2.53.0