[v4,05/15] memory: tegra: Do not handle spurious interrupts

Message ID 30ec0fb1941e2ea2e10808d59f478f022b06266b.1523301400.git.digetx@gmail.com
State New
Headers show
Series
  • Memory controller hot reset
Related show

Commit Message

Dmitry Osipenko April 9, 2018, 7:28 p.m.
The ISR reads interrupts-enable mask, but doesn't utilize it. Apply the
mask to the interrupt status and don't handle interrupts that MC driver
haven't asked for. Kernel would disable spurious MC IRQ and report the
error. This would happen only in a case of a very severe bug.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/memory/tegra/mc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index a4803ac192bb..d2005b995821 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -252,8 +252,11 @@  static irqreturn_t tegra_mc_irq(int irq, void *data)
 	unsigned int bit;
 
 	/* mask all interrupts to avoid flooding */
-	status = mc_readl(mc, MC_INTSTATUS);
 	mask = mc_readl(mc, MC_INTMASK);
+	status = mc_readl(mc, MC_INTSTATUS) & mask;
+
+	if (!status)
+		return IRQ_NONE;
 
 	for_each_set_bit(bit, &status, 32) {
 		const char *error = status_names[bit] ?: "unknown";