From a3fc57bc49a24960fd6a907457f9360a3e65b968 Mon Sep 17 00:00:00 2001 From: Rafael Mendonca Date: Fri, 30 Sep 2022 19:40:59 -0300 Subject: uio: uio_dmem_genirq: Use non-atomic bit operations in irq config and handling This finishes the port of the irq configuration and handling from "uio_pdrv_genirq" to "uio_dmem_genirq". It changes the atomic bit-manipulation routines to their non-atomic counterparts as we are already guarding the code by spinlock. Split out from commit 34cb27528398 ("UIO: Fix concurrency issue"). Signed-off-by: Rafael Mendonca Link: https://lore.kernel.org/r/20220930224100.816175-4-rafaelmendsr@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio_dmem_genirq.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'drivers/uio') diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c index 792c3e9c9ce5..5313307c2754 100644 --- a/drivers/uio/uio_dmem_genirq.c +++ b/drivers/uio/uio_dmem_genirq.c @@ -41,6 +41,11 @@ struct uio_dmem_genirq_platdata { unsigned int refcnt; }; +/* Bits in uio_dmem_genirq_platdata.flags */ +enum { + UIO_IRQ_DISABLED = 0, +}; + static int uio_dmem_genirq_open(struct uio_info *info, struct inode *inode) { struct uio_dmem_genirq_platdata *priv = info->priv; @@ -111,7 +116,7 @@ static irqreturn_t uio_dmem_genirq_handler(int irq, struct uio_info *dev_info) */ spin_lock(&priv->lock); - if (!test_and_set_bit(0, &priv->flags)) + if (!__test_and_set_bit(UIO_IRQ_DISABLED, &priv->flags)) disable_irq_nosync(irq); spin_unlock(&priv->lock); @@ -133,10 +138,10 @@ static int uio_dmem_genirq_irqcontrol(struct uio_info *dev_info, s32 irq_on) spin_lock_irqsave(&priv->lock, flags); if (irq_on) { - if (test_and_clear_bit(0, &priv->flags)) + if (__test_and_clear_bit(UIO_IRQ_DISABLED, &priv->flags)) enable_irq(dev_info->irq); } else { - if (!test_and_set_bit(0, &priv->flags)) + if (!__test_and_set_bit(UIO_IRQ_DISABLED, &priv->flags)) disable_irq_nosync(dev_info->irq); } spin_unlock_irqrestore(&priv->lock, flags); -- cgit v1.2.3-58-ga151