/* * Shared helper functions for devices from the ADAU family * * Copyright 2011-2016 Analog Devices Inc. * Author: Lars-Peter Clausen * * Licensed under the GPL-2 or later. */ #include #include #include #include "adau-utils.h" int adau_calc_pll_cfg(unsigned int freq_in, unsigned int freq_out, uint8_t regs[5]) { unsigned int r, n, m, i, j; unsigned int div; if (!freq_out) { r = 0; n = 0; m = 0; div = 0; } else { if (freq_out % freq_in != 0) { div = DIV_ROUND_UP(freq_in, 13500000); freq_in /= div; r = freq_out / freq_in; i = freq_out % freq_in; j = gcd(i, freq_in); n = i / j; m = freq_in / j; div--; } else { r = freq_out / freq_in; n = 0; m = 0; div = 0; } if (n > 0xffff || m > 0xffff || div > 3 || r > 8 || r < 2) return -EINVAL; } regs[0] = m >> 8; regs[1] = m & 0xff; regs[2] = n >> 8; regs[3] = n & 0xff; regs[4] = (r << 3) | (div << 1); if (m != 0) regs[4] |= 1; /* Fractional mode */ return 0; } EXPORT_SYMBOL_GPL(adau_calc_pll_cfg); MODULE_DESCRIPTION("ASoC ADAU audio CODECs shared helper functions"); MODULE_AUTHOR("Lars-Peter Clausen "); MODULE_LICENSE("GPL v2"); lue='packet-rx-pump-back'>packet-rx-pump-back net-next plumbingsTobias Klauser
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authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /net/netlabel/netlabel_user.c
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'net/netlabel/netlabel_user.c')