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[149.200.78.10]) by smtp.gmail.com with ESMTPSA id j5sm9091734ejk.87.2020.07.31.05.02.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Jul 2020 05:02:22 -0700 (PDT) From: "Saheed O. Bolarinwa" To: helgaas@kernel.org, Kalle Valo , "David S. Miller" , Jakub Kicinski Cc: "Saheed O. Bolarinwa" , bjorn@helgaas.com, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Stanislaw Gruszka , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v4 04/12] iwlegacy: Check if pcie_capability_read_*() reads ~0 Date: Fri, 31 Jul 2020 13:02:32 +0200 Message-Id: <20200731110240.98326-5-refactormyself@gmail.com> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20200731110240.98326-1-refactormyself@gmail.com> References: <20200731110240.98326-1-refactormyself@gmail.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On failure pcie_capability_read_dword() sets it's last parameter, val to 0. However, with Patch 12/12, it is possible that val is set to ~0 on failure. This would introduce a bug because (x & x) == (~0 & x). Since ~0 is an invalid value here, Add an extra check for ~0 to the if condition to ensure success. Suggested-by: Bjorn Helgaas Signed-off-by: Saheed O. Bolarinwa --- drivers/net/wireless/intel/iwlegacy/common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/iwlegacy/common.c b/drivers/net/wireless/intel/iwlegacy/common.c index 348c17ce72f5..659027563260 100644 --- a/drivers/net/wireless/intel/iwlegacy/common.c +++ b/drivers/net/wireless/intel/iwlegacy/common.c @@ -4287,7 +4287,7 @@ il_apm_init(struct il_priv *il) */ if (il->cfg->set_l0s) { pcie_capability_read_word(il->pci_dev, PCI_EXP_LNKCTL, &lctl); - if (lctl & PCI_EXP_LNKCTL_ASPM_L1) { + if ((lctl != (u16)~0) && (lctl & PCI_EXP_LNKCTL_ASPM_L1)) { /* L1-ASPM enabled; disable(!) L0S */ il_set_bit(il, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED); -- 2.18.4