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authorDmitry Osipenko <digetx@gmail.com>2018-04-09 22:28:27 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-08-06 16:24:38 +0200
commit4ea02c98bf3bb86356b460fe42c5c86f932fc3ce (patch)
treeea590f6bc03f9288b95b73d185a41c1b0d6287bd /drivers
parent0743d20878ddec1f959d0fbb419cb4dc2ebfc374 (diff)
memory: tegra: Do not handle spurious interrupts
[ Upstream commit bf3fbdfbec947cdd04b2f2c4bce11534c8786eee ] 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> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/memory/tegra/mc.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index a1ae0cc2b86d..13dcee4ed0cf 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";