[PATCH 265/379][SRU][OEM-5.6] ath11k: fix missing error check on call to ath11k_pci_get_user_msi_assignment

[You-Sheng Yang]

From: Colin Ian King <colin.king at canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1879633

The return error check on the call to ath11k_pci_get_user_msi_assignment is
missing.  If an error does occur, num_vectors is still set to zero and
later on a division by zero can occur when variable vector is being
calculated.  Fix this by adding an error check after the call.

Addresses-Coverity: ("Division or modulo by zero")
Fixes: d4ecb90b3857 ("ath11k: enable DP interrupt setup for QCA6390")
Signed-off-by: Colin Ian King <colin.king at canonical.com>
Signed-off-by: Kalle Valo <kvalo at codeaurora.org>
Link: https://lore.kernel.org/r/20200819111452.52419-1-colin.king@canonical.com
(cherry picked from commit b2c094582e38d667444a13404271752e5fafb2e2)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/net/wireless/ath/ath11k/pci.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index ca7012d46c3f..058885776a3a 100644
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -648,9 +648,12 @@ static int ath11k_pci_ext_irq_config(struct ath11k_base *ab)
 	int i, j, ret, num_vectors = 0;
 	u32 user_base_data = 0, base_vector = 0;
 
-	ath11k_pci_get_user_msi_assignment(ath11k_pci_priv(ab), "DP",
-					   &num_vectors, &user_base_data,
-					   &base_vector);
+	ret = ath11k_pci_get_user_msi_assignment(ath11k_pci_priv(ab), "DP",
+						 &num_vectors,
+						 &user_base_data,
+						 &base_vector);
+	if (ret < 0)
+		return ret;
 
 	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
 		struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];
-- 
2.29.2