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ath11k: fix missing error check on call to ath11k_pci_get_user_msi_assignment

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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: d4ecb90b38 ("ath11k: enable DP interrupt setup for QCA6390")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200819111452.52419-1-colin.king@canonical.com
This commit is contained in:
Colin Ian King 2020-08-19 12:14:52 +01:00 • committed by Kalle Valo
parent bd5dd7aaa4
commit b2c094582e
1 changed files with 6 additions and 3 deletions
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9
drivers/net/wireless/ath/ath11k/pci.c
View file

@ -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];