[dpdk-dev] [PATCH] igb_uio: fix legacy msi masking

[Markus Theil <markus.theil@tu-ilmenau.de>]

MSI masks contain a 1 if interrupt is masked, 0 if unmasked.
I got that wrong with the !!state calculation. For better
readability, the mask is now changed like in igbuio_msi_mask_irq.

Fixes: a8ea1e5fb647 ("igb_uio: fix unknown MSI symbols")

Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
Tested-by: Markus Theil <markus.theil@tu-ilmenau.de>
---
 lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index 0dda26c..b67d775 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -122,13 +122,14 @@ igbuio_msi_mask_irq(struct pci_dev *pdev, struct msi_desc *desc, int32_t state)
 	u32 mask_bits = desc->masked;
 	u32 offset = desc->irq - pdev->irq;
 	u32 mask = 1 << offset;
-	u32 flag = !!state << offset;
 
 	if (!desc->msi_attrib.maskbit)
 		return;
 
-	mask_bits &= ~mask;
-	mask_bits |= flag;
+	if (state != 0)
+		mask_bits &= ~mask;
+	else
+		mask_bits |= mask;
 
 	if (mask_bits != desc->masked) {
 		pci_write_config_dword(pdev, desc->mask_pos, mask_bits);
-- 
2.7.4