diff options
Diffstat (limited to 'drivers/pci/hotplug/pciehp_hpc.c')
| -rw-r--r-- | drivers/pci/hotplug/pciehp_hpc.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index daf54bee720d..8f3d3cff3581 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -111,6 +111,12 @@ static int pcie_poll_cmd(struct controller *ctrl, int timeout) while (true) { pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); + if (slot_status == (u16) ~0) { + ctrl_info(ctrl, "%s: no response from device\n", + __func__); + return 0; + } + if (slot_status & PCI_EXP_SLTSTA_CC) { pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC); @@ -186,6 +192,11 @@ 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) { + ctrl_info(ctrl, "%s: no response from device\n", __func__); + goto out; + } + slot_ctrl &= ~mask; slot_ctrl |= (cmd & mask); ctrl->cmd_busy = 1; @@ -201,6 +212,7 @@ static void pcie_do_write_cmd(struct controller *ctrl, u16 cmd, if (wait) pcie_wait_cmd(ctrl); +out: mutex_unlock(&ctrl->ctrl_lock); } @@ -542,6 +554,11 @@ static irqreturn_t pcie_isr(int irq, void *dev_id) intr_loc = 0; do { pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &detected); + if (detected == (u16) ~0) { + ctrl_info(ctrl, "%s: no response from device\n", + __func__); + return IRQ_HANDLED; + } detected &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD | PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC | |