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[84.0.27.127]) by smtp.gmail.com with ESMTPSA id kt10sm5485833ejb.54.2020.06.19.14.12.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jun 2020 14:12:05 -0700 (PDT) From: refactormyself@gmail.com To: helgaas@kernel.org Cc: Bolarinwa Olayemi Saheed , bjorn@helgaas.com, linux-pci@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] PCI: pciehp: Fix wrong failure check on pcie_capability_read_*() Date: Fri, 19 Jun 2020 22:12:19 +0200 Message-Id: <20200619201219.32126-3-refactormyself@gmail.com> X-Mailer: git-send-email 2.18.2 In-Reply-To: <20200619201219.32126-1-refactormyself@gmail.com> References: <20200619201219.32126-1-refactormyself@gmail.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Bolarinwa Olayemi Saheed On failure, pcie_capabiility_read_*() will set the status value, its last parameter to 0 and not ~0. This bug fix checks for the proper value. Signed-off-by: Bolarinwa Olayemi Saheed --- drivers/pci/hotplug/pciehp_hpc.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 53433b37e181..c1a67054948a 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -89,7 +89,7 @@ static int pcie_poll_cmd(struct controller *ctrl, int timeout) do { pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); - if (slot_status == (u16) ~0) { + if (slot_status == (u16)0) { ctrl_info(ctrl, "%s: no response from device\n", __func__); return 0; @@ -165,7 +165,7 @@ static void pcie_do_write_cmd(struct controller *ctrl, u16 cmd, pcie_wait_cmd(ctrl); pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); - if (slot_ctrl == (u16) ~0) { + if (slot_ctrl == (u16)0) { ctrl_info(ctrl, "%s: no response from device\n", __func__); goto out; } @@ -236,7 +236,7 @@ int pciehp_check_link_active(struct controller *ctrl) int ret; ret = pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status); - if (ret == PCIBIOS_DEVICE_NOT_FOUND || lnk_status == (u16)~0) + if (ret == PCIBIOS_DEVICE_NOT_FOUND || lnk_status == (u16)0) return -ENODEV; ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA); @@ -440,7 +440,7 @@ int pciehp_card_present(struct controller *ctrl) int ret; ret = pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); - if (ret == PCIBIOS_DEVICE_NOT_FOUND || slot_status == (u16)~0) + if (ret == PCIBIOS_DEVICE_NOT_FOUND || slot_status == (u16)0) return -ENODEV; return !!(slot_status & PCI_EXP_SLTSTA_PDS); @@ -592,7 +592,7 @@ static irqreturn_t pciehp_isr(int irq, void *dev_id) read_status: pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &status); - if (status == (u16) ~0) { + if (status == (u16)0) { ctrl_info(ctrl, "%s: no response from device\n", __func__); if (parent) pm_runtime_put(parent); -- 2.18.2