From: Alex Elder <elder@linaro.org>
Date: Tue, 27 Jul 2021 19:46:27 +0000 (-0500)
Subject: net: ipa: clear disabled IPA interrupt conditions
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e70e410f8e7c000b5f44ecba8a1b40d2a2b8c6f1;p=linux.git

net: ipa: clear disabled IPA interrupt conditions

We ignore any IPA interrupt that has no handler.  If any interrupt
conditions without a handler exist when an IPA interrupt occurs,
clear those conditions.  Add a debug message to report which ones
are being cleared.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c
index 7dee4ebaf5a95..c12d0c33557cd 100644
--- a/drivers/net/ipa/ipa_interrupt.c
+++ b/drivers/net/ipa/ipa_interrupt.c
@@ -79,6 +79,7 @@ static void ipa_interrupt_process_all(struct ipa_interrupt *interrupt)
 {
 	struct ipa *ipa = interrupt->ipa;
 	u32 enabled = interrupt->enabled;
+	u32 pending;
 	u32 offset;
 	u32 mask;
 
@@ -87,8 +88,8 @@ static void ipa_interrupt_process_all(struct ipa_interrupt *interrupt)
 	 * only the enabled ones.
 	 */
 	offset = ipa_reg_irq_stts_offset(ipa->version);
-	mask = ioread32(ipa->reg_virt + offset);
-	while ((mask &= enabled)) {
+	pending = ioread32(ipa->reg_virt + offset);
+	while ((mask = pending & enabled)) {
 		do {
 			u32 irq_id = __ffs(mask);
 
@@ -96,7 +97,17 @@ static void ipa_interrupt_process_all(struct ipa_interrupt *interrupt)
 
 			ipa_interrupt_process(interrupt, irq_id);
 		} while (mask);
-		mask = ioread32(ipa->reg_virt + offset);
+		pending = ioread32(ipa->reg_virt + offset);
+	}
+
+	/* If any disabled interrupts are pending, clear them */
+	if (pending) {
+		struct device *dev = &ipa->pdev->dev;
+
+		dev_dbg(dev, "clearing disabled IPA interrupts 0x%08x\n",
+			pending);
+		offset = ipa_reg_irq_clr_offset(ipa->version);
+		iowrite32(pending, ipa->reg_virt + offset);
 	}
 }