Subject: [merged] rapidio-tsi721-fix-bug-in-msi-interrupt-handling.patch removed from -mm tree To: alexandre.bounine@xxxxxxx,mporter@xxxxxxxxxxxxxxxxxxx,stable@xxxxxxxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Tue, 28 May 2013 12:36:51 -0700 The patch titled Subject: rapidio/tsi721: fix bug in MSI interrupt handling has been removed from the -mm tree. Its filename was rapidio-tsi721-fix-bug-in-msi-interrupt-handling.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Alexandre Bounine <alexandre.bounine@xxxxxxx> Subject: rapidio/tsi721: fix bug in MSI interrupt handling Fix bug in MSI interrupt handling which causes loss of event notifications. Typical indication of lost MSI interrupts are stalled message and doorbell transfers between RapidIO endpoints. To avoid loss of MSI interrupts all interrupts from the device must be disabled on entering the interrupt handler routine and re-enabled when exiting it. Re-enabling device interrupts will trigger new MSI message(s) if Tsi721 registered new events since entering interrupt handler routine. This patch is applicable to kernel versions starting from v3.2. Signed-off-by: Alexandre Bounine <alexandre.bounine@xxxxxxx> Cc: Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/rapidio/devices/tsi721.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff -puN drivers/rapidio/devices/tsi721.c~rapidio-tsi721-fix-bug-in-msi-interrupt-handling drivers/rapidio/devices/tsi721.c --- a/drivers/rapidio/devices/tsi721.c~rapidio-tsi721-fix-bug-in-msi-interrupt-handling +++ a/drivers/rapidio/devices/tsi721.c @@ -471,6 +471,10 @@ static irqreturn_t tsi721_irqhandler(int u32 intval; u32 ch_inte; + /* For MSI mode disable all device-level interrupts */ + if (priv->flags & TSI721_USING_MSI) + iowrite32(0, priv->regs + TSI721_DEV_INTE); + dev_int = ioread32(priv->regs + TSI721_DEV_INT); if (!dev_int) return IRQ_NONE; @@ -560,6 +564,14 @@ static irqreturn_t tsi721_irqhandler(int } } #endif + + /* For MSI mode re-enable device-level interrupts */ + if (priv->flags & TSI721_USING_MSI) { + dev_int = TSI721_DEV_INT_SR2PC_CH | TSI721_DEV_INT_SRIO | + TSI721_DEV_INT_SMSG_CH | TSI721_DEV_INT_BDMA_CH; + iowrite32(dev_int, priv->regs + TSI721_DEV_INTE); + } + return IRQ_HANDLED; } _ Patches currently in -mm which might be from alexandre.bounine@xxxxxxx are rapidio-switches-remove-tsi500-driver.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html