[PATCH] cxl: disable the lazy approach for irqs in POWERVM environment.

Christophe Lombard clombard at linux.vnet.ibm.com
Fri Mar 23 03:37:54 AEDT 2018

The cxl driver cannot disable the interrupt at the device level and has
to use disable_irq[_nosync] instead.
To avoid the implementation of the lazy optimisation (the interrupt is
marked disabled, but the hardware is left unmasked), we can disable it,
for a particular irq line, by calling
'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'.

Signed-off-by: Christophe Lombard <clombard at linux.vnet.ibm.com>
 drivers/misc/cxl/guest.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
index f58b4b6c..dc476e1 100644
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -389,6 +389,7 @@ static void disable_afu_irqs(struct cxl_context *ctx)
 		hwirq = ctx->irqs.offset[r];
 		for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
 			virq = irq_find_mapping(NULL, hwirq);
+			irq_set_status_flags(virq, IRQ_DISABLE_UNLAZY);

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