[PATCH net-next] net: ipa: fix build-time bug in ipa_hardware_config_qsb()

[Alex Elder]

Jon Hunter reported observing a build bug in the IPA driver:
  https://lore.kernel.org/netdev/5b5d9d40-94d5-5dad-b861-fd9bef8260e2@xxxxxxxxxx

The problem is that the QMB0 max read value set for IPA v4.5 (16) is
too large to fit in the 4-bit field.

This is a quick fix to resolve the build bug; this might change
again in the future if I learn there is a better value to use.

Reported-by: Jon Hunter <jonathanh@xxxxxxxxxx>
Tested-by: Jon Hunter <jonathanh@xxxxxxxxxx>
Signed-off-by: Alex Elder <elder@xxxxxxxxxx>
---
 drivers/net/ipa/ipa_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index f25bcfe51dd4b..192f9d6bccf19 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -280,7 +280,7 @@ static void ipa_hardware_config_qsb(struct ipa *ipa)
 		max1 = 0;		/* PCIe not present */
 		break;
 	case IPA_VERSION_4_5:
-		max0 = 16;
+		max0 = 15;
 		break;
 	}
 	val = u32_encode_bits(max0, GEN_QMB_0_MAX_READS_FMASK);
-- 
2.20.1