From mboxrd@z Thu Jan 1 00:00:00 1970 From: thierry.reding@gmail.com (Thierry Reding) Date: Mon, 10 Jun 2013 22:36:42 +0200 Subject: [PATCH 1/2] memory: tegra20-mc: Fix hang in IRQ handler. In-Reply-To: <1370855624-30564-2-git-send-email-ttynkkynen@nvidia.com> References: <1370855624-30564-1-git-send-email-ttynkkynen@nvidia.com> <1370855624-30564-2-git-send-email-ttynkkynen@nvidia.com> Message-ID: <20130610203641.GA26036@mithrandir> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Jun 10, 2013 at 12:13:43PM +0300, Tuomas Tynkkynen wrote: > In Tegra20 memory controller any MC interrupt would cause an > infinite loop in the IRQ handler. > > Signed-off-by: Tuomas Tynkkynen > --- > drivers/memory/tegra20-mc.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/memory/tegra20-mc.c b/drivers/memory/tegra20-mc.c > index 2ca5f28..bd5a553 100644 > --- a/drivers/memory/tegra20-mc.c > +++ b/drivers/memory/tegra20-mc.c > @@ -193,8 +193,11 @@ static irqreturn_t tegra20_mc_isr(int irq, void *data) > mask &= stat; > if (!mask) > return IRQ_NONE; > - while ((bit = ffs(mask)) != 0) > + while ((bit = ffs(mask)) != 0) { > tegra20_mc_decode(mc, bit - 1); > + mask &= BIT(bit); Shouldn't this be "mask &= ~BIT(bit);"? The intent of the code is to clear the bit which was handled by the loop body, right? The above clears all other bits instead. Thierry -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 836 bytes Desc: not available URL: