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Index: sys/dev/pci/pci.c
===================================================================
--- sys/dev/pci/pci.c
+++ sys/dev/pci/pci.c
@@ -1671,10 +1671,13 @@
KASSERT(msix->msix_msgnum > index, ("bogus index"));
offset = msix->msix_table_offset + index * 16 + 12;
val = bus_read_4(msix->msix_table_res, offset);
- if (!(val & PCIM_MSIX_VCTRL_MASK)) {
- val |= PCIM_MSIX_VCTRL_MASK;
- bus_write_4(msix->msix_table_res, offset, val);
- }
+ val |= PCIM_MSIX_VCTRL_MASK;
+
+ /*
+ * Some devices (e.g. Samsung PM961) do not support reads of this
+ * register, so always write the new value.
+ */
+ bus_write_4(msix->msix_table_res, offset, val);
}
void
@@ -1687,10 +1690,13 @@
KASSERT(msix->msix_table_len > index, ("bogus index"));
offset = msix->msix_table_offset + index * 16 + 12;
val = bus_read_4(msix->msix_table_res, offset);
- if (val & PCIM_MSIX_VCTRL_MASK) {
- val &= ~PCIM_MSIX_VCTRL_MASK;
- bus_write_4(msix->msix_table_res, offset, val);
- }
+ val &= ~PCIM_MSIX_VCTRL_MASK;
+
+ /*
+ * Some devices (e.g. Samsung PM961) do not support reads of this
+ * register, so always write the new value.
+ */
+ bus_write_4(msix->msix_table_res, offset, val);
}
int

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