ipmi_si: Fix crash when using hard-coded device
When excuting a command like: modprobe ipmi_si ports=0xffc0e3 type=bt The system would get an oops. The trouble here is that ipmi_si_hardcode_find_bmc() is called before ipmi_si_platform_init(), but initialization of the hard-coded device creates an IPMI platform device, which won't be initialized yet. The real trouble is that hard-coded devices aren't created with any device, and the fixup is done later. So do it right, create the hard-coded devices as normal platform devices. This required adding some new resource types to the IPMI platform code for passing information required by the hard-coded device and adding some code to remove the hard-coded platform devices on module removal. To enforce the "hard-coded devices passed by the user take priority over firmware devices" rule, some special code was added to check and see if a hard-coded device already exists. Reported-by: Yang Yingliang <yangyingliang@huawei.com> Cc: stable@vger.kernel.org # v4.15+ Signed-off-by: Corey Minyard <cminyard@mvista.com> Tested-by: Yang Yingliang <yangyingliang@huawei.com>
This commit is contained in:
Corey Minyard
@@ -3,6 +3,7 @@
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#define pr_fmt(fmt) "ipmi_hardcode: " fmt
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include "ipmi_si.h"
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/*
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@@ -12,23 +13,22 @@
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#define SI_MAX_PARMS 4
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static char *si_type[SI_MAX_PARMS];
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#define MAX_SI_TYPE_STR 30
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static char si_type_str[MAX_SI_TYPE_STR];
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static char si_type_str[MAX_SI_TYPE_STR] __initdata;
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static unsigned long addrs[SI_MAX_PARMS];
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static unsigned int num_addrs;
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static unsigned int ports[SI_MAX_PARMS];
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static unsigned int num_ports;
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static int irqs[SI_MAX_PARMS];
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static unsigned int num_irqs;
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static int regspacings[SI_MAX_PARMS];
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static unsigned int num_regspacings;
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static int regsizes[SI_MAX_PARMS];
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static unsigned int num_regsizes;
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static int regshifts[SI_MAX_PARMS];
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static unsigned int num_regshifts;
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static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */
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static unsigned int num_slave_addrs;
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static int irqs[SI_MAX_PARMS] __initdata;
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static unsigned int num_irqs __initdata;
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static int regspacings[SI_MAX_PARMS] __initdata;
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static unsigned int num_regspacings __initdata;
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static int regsizes[SI_MAX_PARMS] __initdata;
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static unsigned int num_regsizes __initdata;
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static int regshifts[SI_MAX_PARMS] __initdata;
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static unsigned int num_regshifts __initdata;
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static int slave_addrs[SI_MAX_PARMS] __initdata;
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static unsigned int num_slave_addrs __initdata;
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module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
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MODULE_PARM_DESC(type, "Defines the type of each interface, each"
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@@ -73,12 +73,133 @@ MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
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" overridden by this parm. This is an array indexed"
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" by interface number.");
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int ipmi_si_hardcode_find_bmc(void)
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static struct platform_device *ipmi_hc_pdevs[SI_MAX_PARMS];
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static void __init ipmi_hardcode_init_one(const char *si_type_str,
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unsigned int i,
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unsigned long addr,
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unsigned int flags)
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{
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int ret = -ENODEV;
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int i;
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struct si_sm_io io;
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struct platform_device *pdev;
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unsigned int num_r = 1, size;
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struct resource r[4];
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struct property_entry p[6];
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enum si_type si_type;
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unsigned int regspacing, regsize;
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int rv;
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memset(p, 0, sizeof(p));
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memset(r, 0, sizeof(r));
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if (!si_type_str || !*si_type_str || strcmp(si_type_str, "kcs") == 0) {
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size = 2;
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si_type = SI_KCS;
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} else if (strcmp(si_type_str, "smic") == 0) {
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size = 2;
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si_type = SI_SMIC;
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} else if (strcmp(si_type_str, "bt") == 0) {
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size = 3;
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si_type = SI_BT;
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} else if (strcmp(si_type_str, "invalid") == 0) {
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/*
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* Allow a firmware-specified interface to be
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* disabled.
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*/
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size = 1;
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si_type = SI_TYPE_INVALID;
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} else {
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pr_warn("Interface type specified for interface %d, was invalid: %s\n",
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i, si_type_str);
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return;
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}
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regsize = regsizes[i];
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if (regsize == 0)
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regsize = DEFAULT_REGSIZE;
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p[0] = PROPERTY_ENTRY_U8("ipmi-type", si_type);
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p[1] = PROPERTY_ENTRY_U8("slave-addr", slave_addrs[i]);
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p[2] = PROPERTY_ENTRY_U8("addr-source", SI_HARDCODED);
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p[3] = PROPERTY_ENTRY_U8("reg-shift", regshifts[i]);
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p[4] = PROPERTY_ENTRY_U8("reg-size", regsize);
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/* Last entry must be left NULL to terminate it. */
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/*
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* Register spacing is derived from the resources in
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* the IPMI platform code.
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*/
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regspacing = regspacings[i];
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if (regspacing == 0)
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regspacing = regsize;
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r[0].start = addr;
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r[0].end = r[0].start + regsize - 1;
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r[0].name = "IPMI Address 1";
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r[0].flags = flags;
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if (size > 1) {
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r[1].start = r[0].start + regspacing;
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r[1].end = r[1].start + regsize - 1;
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r[1].name = "IPMI Address 2";
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r[1].flags = flags;
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num_r++;
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}
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if (size > 2) {
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r[2].start = r[1].start + regspacing;
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r[2].end = r[2].start + regsize - 1;
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r[2].name = "IPMI Address 3";
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r[2].flags = flags;
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num_r++;
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}
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if (irqs[i]) {
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r[num_r].start = irqs[i];
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r[num_r].end = irqs[i];
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r[num_r].name = "IPMI IRQ";
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r[num_r].flags = IORESOURCE_IRQ;
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num_r++;
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}
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pdev = platform_device_alloc("hardcode-ipmi-si", i);
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if (!pdev) {
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pr_err("Error allocating IPMI platform device %d\n", i);
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return;
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}
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rv = platform_device_add_resources(pdev, r, num_r);
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if (rv) {
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dev_err(&pdev->dev,
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"Unable to add hard-code resources: %d\n", rv);
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goto err;
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}
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rv = platform_device_add_properties(pdev, p);
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if (rv) {
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dev_err(&pdev->dev,
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"Unable to add hard-code properties: %d\n", rv);
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goto err;
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}
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rv = platform_device_add(pdev);
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if (rv) {
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dev_err(&pdev->dev,
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"Unable to add hard-code device: %d\n", rv);
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goto err;
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}
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ipmi_hc_pdevs[i] = pdev;
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return;
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err:
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platform_device_put(pdev);
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}
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void __init ipmi_hardcode_init(void)
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{
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unsigned int i;
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char *str;
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char *si_type[SI_MAX_PARMS];
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/* Parse out the si_type string into its components. */
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str = si_type_str;
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@@ -95,54 +216,45 @@ int ipmi_si_hardcode_find_bmc(void)
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}
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}
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memset(&io, 0, sizeof(io));
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for (i = 0; i < SI_MAX_PARMS; i++) {
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if (!ports[i] && !addrs[i])
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continue;
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io.addr_source = SI_HARDCODED;
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pr_info("probing via hardcoded address\n");
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if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) {
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io.si_type = SI_KCS;
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} else if (strcmp(si_type[i], "smic") == 0) {
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io.si_type = SI_SMIC;
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} else if (strcmp(si_type[i], "bt") == 0) {
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io.si_type = SI_BT;
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} else {
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pr_warn("Interface type specified for interface %d, was invalid: %s\n",
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i, si_type[i]);
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continue;
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}
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if (ports[i]) {
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/* An I/O port */
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io.addr_data = ports[i];
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io.addr_type = IPMI_IO_ADDR_SPACE;
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} else if (addrs[i]) {
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/* A memory port */
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io.addr_data = addrs[i];
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io.addr_type = IPMI_MEM_ADDR_SPACE;
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} else {
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pr_warn("Interface type specified for interface %d, but port and address were not set or set to zero\n",
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i);
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continue;
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}
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io.addr = NULL;
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io.regspacing = regspacings[i];
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if (!io.regspacing)
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io.regspacing = DEFAULT_REGSPACING;
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io.regsize = regsizes[i];
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if (!io.regsize)
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io.regsize = DEFAULT_REGSIZE;
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io.regshift = regshifts[i];
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io.irq = irqs[i];
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if (io.irq)
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io.irq_setup = ipmi_std_irq_setup;
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io.slave_addr = slave_addrs[i];
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ret = ipmi_si_add_smi(&io);
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if (i < num_ports && ports[i])
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ipmi_hardcode_init_one(si_type[i], i, ports[i],
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IORESOURCE_IO);
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if (i < num_addrs && addrs[i])
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ipmi_hardcode_init_one(si_type[i], i, addrs[i],
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IORESOURCE_MEM);
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}
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return ret;
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}
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void ipmi_si_hardcode_exit(void)
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{
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unsigned int i;
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for (i = 0; i < SI_MAX_PARMS; i++) {
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if (ipmi_hc_pdevs[i])
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platform_device_unregister(ipmi_hc_pdevs[i]);
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}
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}
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/*
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* Returns true of the given address exists as a hardcoded address,
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* false if not.
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*/
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int ipmi_si_hardcode_match(int addr_type, unsigned long addr)
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{
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unsigned int i;
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if (addr_type == IPMI_IO_ADDR_SPACE) {
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for (i = 0; i < num_ports; i++) {
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if (ports[i] == addr)
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return 1;
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}
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} else {
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for (i = 0; i < num_addrs; i++) {
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if (addrs[i] == addr)
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return 1;
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}
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}
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return 0;
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}
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