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

[Markus Theil]

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.th...@tu-ilmenau.de>
Tested-by: Markus Theil <markus.th...@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