lkml.org 
[lkml]   [2018]   [Apr]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 05/15] memory: tegra: Do not handle spurious interrupts
Date
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(-)

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";
--
2.16.3
\
 
 \ /
  Last update: 2018-04-09 21:31    [W:0.132 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site